Water CoolingCoils

Type KWS Single SerpentineType KWH Half serpentineType KWD Double Serpentine

Bulletin K70-KWS-PDI-111064614

PRODUCT DATA &INSTALLATION

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NOMENCLATURETYPE MODEL FACE DIMENSIONS

SDH

KW - 1 0 5 - 18 x 45

Coil Type

CIRCUITING:S = Single SerpentineD = Double SerpentineH = Half Serpentine

Nominal Tube Length (inches)

“W” Dimensions (inches)

Rows Deep

Fin Series (70, 80, 100or 120) (100 shown)

CONTENTSWater Cooling Coils ........................................ 2General Specifications .................................... 3Type KWS Coil ................................................ 4Nomenclature .................................................. 4Type KWH and KWD Water Coils ................... 5General Formulas ........................................... 6Wet Bulb Depression Ratio ............................. 6System Design ................................................ 7Coil Selection - Sizes - Table 1 ....................... 7Coil Selection - Fin Series Capacity Correction Factors - Table 2 .................... 8Coil Selection - General Considerations ......... 8Conversion of Air Volume to Standard Air ....... 9Total Heat - Table 3 ........................................ 10Explanation for Using Direct Selection Tables..............................11, 12Direct Selection - Table 4 ..................... 13 to 21Example Coil Selection No. 1 ........................ 22Example Coil Selection No. 2 ................... 23,24Mean Effective Temperature Difference -Table 5 ................................ 25

Standard Coil Circuiting - Table 6 .................. 26Wetted Surface Factor - Figure 3.................. 26Heat Transfer Coefficient - Figure 4 .............. 27Fin Correction - Table 7 ................................. 27Wet Bulb Depression Factors ....................... 28Air Pressure Drop - Figure 6 ......................... 29Air Friction Fin Series Correction Factors -Table 8 .................................... 29Air Friction Sample Calculation Example No.3 ........................................ 29Water Pressure Drop Curve - Figure 7 ......... 30Water Pressure Drop Correction Factors and Example Problems ......................... 31Water Pressure Drop Coil Type - Table 9 ...... 31Dimensional Drawings .................................. 32Application Recommendations ..................... 33Pipe Size Selection Chart - Figure 1 1 .......... 33Psychrometric Functions .............................. 34Psychrometric Chart - Figure 16 ................... 35Engineering Specifications ............................ 36

MECHANICALPRESSURE BONDKeepRite MechanicalPressure Bond guaranteesthat each tube and fin collarmake positive permanentmetal to metal contact.No need for using lowconductivity metals or alloys,

FLANGED CASINGSDouble flanged galvanizedsteel casings on allKeepRite Water HeatingCoils provide greaterstrength - better supportfor easier coil stacking.

Simplifies moving and handling operations.Top and bottom casing flanges are turned back toform two channel sections in a “box shape”.Provides maximum strength and durability.

FULL FINCOLLARSEfficient KeepRitefin presses performmulti - stage operationsto draw full fin collarswith wide, smooth surfacesthat completely cover coiltubes - actually form a tube within a tube forgreater strength and maximum heat transfer.

Lack of sharp collar edges make KeepRiteCoils easier to clean - smoother KeepRiteCollars retard lint and dirt accumulation.

- 2 -

COPPER TUBE HEADERSMade from heavy gauge seamless drawn coppertube, KeepRite designed headers lengthen coil life- provide necessary header flexibility tocompansate for expansion and contraction duringoperation.

Header flexibility also reduces coil core “strains”during start up. Further proof that KeepRitedesign means long life and top performance.

Water Cooling Coils

AVAILABLE IN FOUR STANDARDFIN SPACING

70 FIN SERIES is designed and used for applications re-quiring high latent loads and for installations requiring low

air pressure drop. With the 70 Fin Series Coil, it is possi-ble to more accurately match sensible and total loads,particularly when the water temperature is low and the

entering wet bulb air temperature is high.

80 FIN SERIES has been more or less a standard in the

industry for 15 to 20 years. This fin series and the 100 FinSeries surface are widely used for regularcommercial applications because the S/T ratios achieved

with these surfaces meet the normal S/T ratiorequirements.When only the 80 Fin Series Coil surface was available,

frequently more rows of coil were required to meet either atotal or sensible load than is now required with 100 and120 Fin Series Coils. When extra rows are furnished to

meet either a sensible or total requirement, theexcessive capacity furnished can result in something lessthan ideal conditions in the conditioned space.

100 FIN SERIES introduced approximately ten years agoby KeepRite has been furnished for special industrial

applications that require higher than normal sensiblecooling loads. Experience has shown this is an excellentheat transfer surface, not only for high sensible load

requirements, but also for average S/T ratio jobs, whenspace will not permit larger face areas and/or more rowsto be installed and capacity requirements exceed the

capabilities of 80 Fin Series Coils.The increase in air friction that results by changing froman 80 Fin Series to a 100 Fin Series with shallow depth

coils is usually less than the increase in air friction if oneadditional row of 80 Fin Series Coil is utilized.

120 FIN SERIES was designed as a maximum capacitysurface with reasonable air pressure drop and isparticularly suitable for use in commercial and industrial

installations requiring higher than average sensible totalratios.The 120 Fin Series heat transfer surface offers the

maximum BTU capacity per dollar invested forapplications where this surface is suitable. The 120 FinSeries provides the maximum amount of total external

surface per sq. ft. of face area per row deep that ispractical without encountering excessive air pressuredrops.

PRIMARY SURFACE - 5/8" O.D. round coppertubes on 11/2" equilateral centers.

SECONDARY SURFACE-Rippled aluminum or copper, dieformed plate type fins. Fin collars are full drawn to provide

accurate control of fin spacing and to completely cover thetube for maximum heat transfer.

HEADERS-Extra heavy seamless copper tubing. Tubeholes provide flexibility for uneven stresses and the

maximum brazing surface possible.

CONNECTIONS-Male pipe supply and returnconnections.

BRAZING-All core joints are brazed with copperbrazing alloys.

CASING-Die formed heavy gauge continuous galvanized

steel with reinforced mounting flanges. Fin anglescompletely brace the core assembly in the casing of alllarge coils to prevent air by-pass and damage in shipment.

VENTS AND DRAINS-Furnished on all coils.

TESTS - Complete coil tested leak free at 300 PSIG

air pressure under water.

OPERATING CONDITIONS-Standard coils are suitable for

use up to 200 PSIG.

GENERALSPECIFICATIONS

- 3 -

WATER COOLING COILS

TYPE “KWS” COILSType “KWS” Coils are specifically designed andengineered to meet most applications requiring normalwater quantities and normal water pressure drop.Type “KWS” Coils are counterflow, single serpentinecircuited to deliver absolute maximum performance.With single serpentine coils every tube in the first row isfed as indicated in the circuiting drawing on the right.

Type “KWS” Coils of two, four, six, eight and ten rowsdeep are furnished with the supply and return connec-tions on the same and of the coil.

TYPE “KWD” COILSType “KWD” Coils are designed for use in applicationsthat require high water quantities and low water pressuredrop.“KWD” Coils are counterflow, double serpentine circuitedto maintain normal water velocities and low waterpressure drops. With double serpentine coils every tube inthe first and second rows are fed as shown in thecircuiting drawing on the eright.

Fourn and eight row coils have the supply and returnconnections on the same end of the coil.

TYPE “KWH” COILSType “KWH” Coils are designed to produce highcapacity with limited water quantity. High capacity isobtained from the counterflow half serpentine watercircuiting which gives higher water velocities.With half serpentine coils every other tube in the firstrow is fed as shown in the circuiting drawing on theright.All Type “KWH” Coils, regardless of row depth, haveboth the supply and return connections on the same endof the coil. When ordering KWH Coils, state vertical orhorizontal air flow as required.

- 4 -

AIR

FL

OW

8 ROW KWD CIRCUITINGHORIZONTAL OR VERTICAL AIR FLOW

6 ROW KWS CIRCUITINGHORIZONTAL OR VERTICAL AIR FLOW

AIR

FL

OW

4 ROW KWH CIRCUITINGHORIZONTAL AIR FLOW

AIR

FL

OW

GENERAL INFORMATION

- 5 -

1. TOTAL BTU/HR Total BTU/HR = 4.5 x CFM X (Total Heat Ent. Air - Total Heat Lv. Air)

Where 4.5 = Density Std. Air x 60 Density Std. Air = .075 lbs./Cu. Ft. Minutes/hr. = 60

2. TOTAL BTU/HR Total BTU/HR = 500 X GPM X (Lv. Water Temp. - Ent. Water Temp.) Where 500 = Lbs./Gal. X Min./Hr. X Specific Heat Water

Lbs./Gal. = 8.33 Min./Hr. = 60 Sp. Heat Water = 1

3. SENSIBLE BTU/HR Sensible BTU/HR = 1.09 X CFM X (Ent. Air D.B. - Lv. Air D.B.)

Where 1.09 = (sp. Ht. of air at 70°F.) X (Minutes/Hr.) X Density Std. Air

Sp. Ht. of Air = .24 at 70°F. Min./Hr. = 60 Density Std. Air = .075 Lbs./Cu. Ft.

4. LEAVING AIR DRY BULB TEMPERATURE Sens. BTU/HR (a) Lv. Air D.B. = Ent. Air D.B. =

1.09 X CFM

(b) Ly. Air D.B. = Lv. W.B. + (W.B. Depression Factor X Initial W.B. Depression) (c) Lv. Air D.B. = Lv. W.B. + Final W.B. Depression

5. WATER VELOCITY 1.144* x GPM Water Velocity FPS =

Number tubes fed

*Use 1.326 for high pressure coils Use 1.35 for .049 tube wall.

Total BTU/HR 6. ROWS DEEP =

Face Area. ( Sq. Ft.) x WSF x Med. x U x FFR

Where WSF = Wetted Surface Factor (From Figure 3 , Page 26) MED = Log Mean Temperature Difference (From Table 5, Page 24) F

FR = Fin Series Correction Factor (From Table 7, Page 27

7. FACE AREA

CFM F.A. =

Face Velocity (FPM)

8. FACE VELOCITY

CFM F.V. = Face Area (Sq. Ft.)

9. SENSIBLE TOTAL RATIO

Sensible BTU/HR S/T Ratio =

Total BTU/-HR

10. TONS PER SQUARE FOOT OF FACE AREA

Total BTU/HR Tons/Sq. Ft. = Face Area (Sq. Ft.) X 12000

11. INITIAL W.B. DEPRESSION Initial W.B. Depression = Entering D. B.- Entering W.B.

12. FINAL W.B. DEPRESSION Final W.B. Depression = leaving D.B. - leaving W.B.

Since both sensible and latent heat transfer are occurringsimultaneously between the surface of a chilled waterdehumidifying coil and the air passing over it, some coilperformance factor which establishes the relationshipbetween these two modes of heat transfer is required. Forthis purpose KeepRite employs the wet bulb depressionfactor which has the general acceptance of the finned tubecoil industry.The wet bulb depression factor is the ratio of the leaving airto entering air wet bulb depressions and is expressed asfollows:Wet Bulb Depression

Leaving Wet Bulb DepressionFactor (WBDF) =

Entering Wet Bulb Depression

= Lvg. Air D.B. - Lvg. Air W.B.

Temp. Ent. Air D.B. - Ent. Air W.B.Temp.For the example illustrated below, the Wet BulbDepression Factor Is:

WBDF = 61°F - 58°F 3

= .231 80°F - 67°F = 13Since the wet bulb depression factor describes a heattransfer relationship on the fin side of a coil only, it varieswith the air side heat transfer performance, the amount ofheat transfer surface and with the air velocity.The WBdepression factor is determined by laboratory tests of eachparticular coil surface design. It should be noted that it is

WET BULB DEPRESSION RATIOnot influenced by the water flow rate. The wet bulbdepression factor does not apply to dry surface coolingcoils and is recommended for application only where thesensible to total heat ratio is 0.9 or less. When thesensible to total ratio is greater than 0.9, the fin surfaceis essentially dry and the coil selection can be based ondry surface to handle the total load.Curves giving the wet bulb depression factors forKeepRite Water Cooling Coils are shown on page 27.

TEMPERATURE °F

AIR CONDITIONENTERING COIL

ENTERING W.B.DEPRESSION

AIR CONDITIONLEAVING COIL

SATURATION CURVE

LEAVINGW.B.

DEPRESSION

ENTERING67°F WET BULBTEMP.

LEAVING58°F WET BULBTEMP.

58 61 67 80

- 6 -

In determining the CFM to circulate, the consultingengineer normally considers: the volume of the conditionedspace, type of occupance or usage of the space, total load,sensible load, ventilation requirements, air velocity in thespace (perceptability of air movement) and the sizes ofducts required. Usually several of these factors affect thedetermination of the CFM to be circulated; however, anyone factor may be controlling.

After determining the controlling factor or factors, the CFMcan be determined by any of the following methods or bytaking a compromise value between results obtained byseveral of these methods. 1. CFM per ton (usually 400)

2. CFM for sensible load

CFM = Sensible load (internal)

1.09 x (Ent. D.B. - lv. D.B.)

SYSTEM DESIGN AIR QUANITY DETERMINATION

3. CFM for total load Total load

CFM =

(4.5) (Enthalpy Ent. - Enthalpy Lvg.)

4. Air changes per hour (from A.S.H.R.A.E. Guide)

5. Ventilation requirements (from A.S.H.R.A.E. Guide)

6. Fixed diffusion temperature (Ent. D.B - Lvg. D.B.) (Usually 15° to 25°F.)

Although both total and sensible loads must beconsidered in the final analysis, general practice is toconsider only the internal sensible load. Unless aprocess is involved, usually the leaving dry bulbtemperature must be assumed and this is normally doneby actually assuming a diffusion temperature.

COIL SELECTION

SIZESTABLE 1 - COIL SIZES - NOMINAL FACE AREA IN SQ. FT.

In addition to the Finned Lengths listed above, KeepRite Refrigeration can furnish coils having any Finned Lengthrequired up to 144 inches.

"W"INCHES

NOMINAL TUBE LENGTH - NTL - (INCHES)

12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78

6 .50 .62 .75 .87 1.00 1.13 1.25 1.38 1.50 1.63 1.75 1.88 2.0 2.1 2.2 2.4 2.5 2.6 2.7 2.9 3.0

9 .75 .94 1.12 1.31 1.50 1.69 1.87 2.06 2.25 2.44 2.62 2.81 3.0 3.2 3.4 3.6 3.7 3.9 4.1 4.3 4.5

12 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.0 4.3 4.5 4.8 5.0 5.3 5.5 5.8 6.0 6.3 6.5

15 1.56 1.87 2.19 2.50 2.81 3.12 3.44 3.75 4.06 4.37 4.68 5.0 5.3 5.6 5.9 6.2 6.6 6.9 7.2 7.5 7.8 8.1

18 2.25 2.62 3.00 3.37 3.75 4.12 4.50 4.87 5.25 5.62 6.0 6.4 6.7 7.1 7.5 7.9 8.2 8.6 9.0 9.4 9.7

21 3.06 3.50 3.94 4.37 4.82 5.25 5.69 6.12 6.56 7.0 7.4 7.9 8.3 8.7 9.2 9.6 10.1 10.5 10.9 11.4

24 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0

27 5.06 5.62 6.19 6.75 7.32 7.87 8.44 9.0 9.6 10.1 10.7 11.2 11.8 12.4 12.9 13.5 14.1 14.6

30 6.25 6.88 7.50 8.12 8.75 9.37 10.0 10.6 11.2 11.9 12.5 13.1 13.7 14.4 15.0 15.6 16.2

33 7.56 8.25 8.94 9.62 10.30 11.0 11.7 12.4 13.1 13.7 14.4 15.1 15.8 16.5 17.2 17.9

36 9.00 9.75 10.50 11.20 12.0 12.7 13.5 14.2 15.0 15.7 16.5 17.2 18.0 18.7 19.5

"W"INCHES

81 84 87 90 93 96 99 102 105 108 111 114 117 120 123 126 129 132 135 138 141 144

12 6.8 7.0 7.3 7.5 7.8 8.0 8.3 8.5 8.8 9.0 9.3 9.5 9.8 10.0

15 8.4 8.7 9.1 9.4 9.7 10.0 10.3 10.6 10.9 11.2 11.6 11.9 12.2 12.5

18 10.1 10.5 10.9 11.2 11.6 12.0 12.4 12.7 13.1 13.5 13.9 14.2 14.6 15.0 15.4 15.8

21 11.8 12.2 12.7 13.1 13.6 14.0 14.4 14.9 15.3 15.7 16.2 16.6 17.1 17.5 17.9 18.4 18.8 19.3

24 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0

27 15.2 15.7 16.3 16.9 17.4 18.0 18.6 19.1 19.7 20.2 20.8 21.4 21.9 22.5 23.1 23.6 24.2 24.8 25.3 25.9 26.4 27.0

30 16.9 17.5 18.1 18.7 19.3 20.0 20.6 21.2 21.9 22.5 23.1 23.7 24.4 25.0 25.6 26.2 26.9 27.5 28.1 28.8 29.4 30.0

33 18.6 19.2 19.7 20.6 21.3 22.0 22.7 23.4 24.0 24.7 25.4 26.1 26.8 27.5 28.2 28.9 29.6 30.2 30.9 31.6 32.3 33.0

36 20.2 21.0 21.8 22.5 23.2 24.0 24.7 25.5 26.2 27.0 27.7 28.5 29.2 30.0 30.7 31.5 32.2 33.0 33.7 34.5 35.2 36.0

COIL SELECTION

- 7 -

FIN SERIES CAPACITY CORRECTION FACTORS TABLE No. 2 FFD

For use with tons per sq. ft. from Direct Selection Table No. 4

The cooling process should always be plotted on aPsychrometric Chart (Page 34) to be sure that the desiredpsychromatic changes are feasible.

When selecting a coil it should be remembered that if therequired leaving wet bulb temperature is met, the total load

is satisfied and vice versa. Also, when the requiredleaving dry bulb temperature is met, the sensible loadrequirement is satisfied.

A coil must meet both the total and sensible loadrequirement in order to achieve the conditions desired in thespace to be cooled. Normally the total load capacity is

checked first, however, the leaving dry bulb should alwaysbe checked. When the sensible total ratio is low, the coilselection is normally controlled by the total load even though

the sensible cooling capacity may exceed the requirement.In some cases if the leaving dry bulb temperature is too low,re-heat may be required.

When the S/T ratio is high the coil selection is normallycontrolled by the sensible cooling even though the total ca-pacity may exceed that required by an appreciable amount.

If the total capacity far exceeds the requirement, a re-checkon the system should be made to be suresufficient system capacity is available.

MATCHING SENSIBLE-LATENT REQUIREMENTSTo more accurately meet sensible and total loads, 70 and

80 Fin Series Coils are recommended for lower S,/T ratios,and 100 and 120 Fin Series for higher S/T ratios. Fornormal S/T ratios, Fin Series 80 and 100 are recommended.

Normal cooling coil face velocities are from 400 to 600 FPM.500 FPM is recommended for most applications. Moisturecarry-over tends to become a problem when face

velocities in excess of 600 FPM are used unless dry

GENERAL CONSIDERATIONScooling occurs or special consideration is given in

advance to moisture elimination. KeepRite Rippled FinCoils of any standard fin series when properly installedand operated in the normal range, will not require

eliminator plates.

Water cooling coils are normally selected to have a tube

length of three to four times the header height for economyin coil and duct costs. Coils of several different facedimensions are usually available from Table 1 page 6 to

meet the required face area. Select the most desirable.Water velocity in the tubes of approximately 3 to 4 FPS isdesirable to attain high heat transfer rates with a

reasonable water pressure drop.Cooling coils should not normally exceed 36 inches high(“W” dimension) as the condensate draining from the top

portion of the coil tends to load up on the lower portion ofthe coil. On high latent loads a significant reduction in airflow and performance may result. Where “W” dimension

exceeds 36" we recommend two or more coils bankedone above the other and installed in accordance with therecommendations shown on page 32.

In general, the capacity of a Type KWH (half serpentine)Coil is higher than a Type KWS (single serpentine) for thesame entering air and water conditions because of higher

water velocity. However, the water pressure drop is higher.The capacity of a Type KWD (double serpentine) Coil islower than a Type KWS for the same entering air and wa-

ter conditions because of lower water velocity.However, the water pressure drop is lower.

When a coil has a high S /T Ratio, .9 or above, the coilshould be considered dry and selected as a dry coil.

ROWSDEEP

FIN SERIES

70 80 100 120

46

8

.89

.91

.92

1.00

1.00

1.00

1.12

1.09

1.07

1.22

1.17

1.13

CONVERSION OF AIR VOLUME TO STANDARD AIR

- 8 -

FIGURE 1 - TEMPERATURE CONVERSION FACTOR

FIGURE 2 - ALTITUDE CONVERSION FACTOR

When the specified air volume (CFM) is given at any temperature other than 70 °F or at any altitude other than sea level, these charts should beused for correction before using the following capacity and friction tables (which are based on CFM @ standard air conditions).

Example: To convert 15,900 CFM of air at 94 °F and at 3,000ft. altitude to standard conditions:

CFM of Std. Air= CFM of specified Air x F

1 x F

2

= 15,900 X 955 X .896 = 13,600

Where: F1 = Temperature conversion factor from Fig. 1.

F2 = Altitude conversion factor from Fig. 2.

TE

MP

ER

AT

UR

E C

ON

VE

RS

ION

FA

CT

OR

(F

1)1.30

1.25

1.20

1.15

1.10

1.05

1.00

0.95

0.90

0.85

0.80

0.75

0.70

0.65-50 -25 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

TE

MP

ER

AT

UR

E C

ON

VE

RS

ION

FA

CT

OR

(F

2)

1.025

1.000

0.975

0.950

0.925

0.900

0.875

0.850

0.825

0.800

0.775

0.750

0.725

0.700-500 0 500 1500 2500 3500 4500 5500 6500 7500 8500

1.025

1.000

0.975

0.950

0.925

0.900

0.875

0.850

0.825

0.800

0.775

0.750

0.725

0.700

1.30

1.25

1.20

1.15

1.10

1.05

1.00

0.95

0.90

0.85

0.80

0.75

0.70

0.65

TEMPERATURE °F

ALTITUDE (FEET ABOVE SEA LEVEL)

TOTAL HEAT(Enthalpy)

- 9 -

TABLE No. 3 - BTU CONTENT OF 1 LB. OF DRY AIR WITH WATER VAPOR TO SATURATE IT†(Standard Atmospheric Pressure 29.921” HG.)

* Use wet bulb temperature only in determining total heat. † Compiled from data in ASHRAE GUIDE for 1967

WETBULB°F. *

TENTHS OF DEGREES

.0 .1 .2 .3 .4 .5 .6 .7 .8 .9

3536373839

13.0113.4413.8714.3214.77

13.0513.4813.9214.3614.82

13.0913.5213.9614.4114.86

13.1413.5714.0114.4514.91

13.1813.6114.0514.5014.95

13.2213.6614.1014.5415.00

13.2713.7014.1414.5915.05

13.3113.7414.1914.6315.09

13.3513.7914.2314.6815.14

13.3913.8314.2714.7315.18

4041424344

15.2315.7016.1716.6617.15

15.2815.7416.2216.7117.20

15.3215.7916.2716.7517.25

15.3715.8416.3216.8017.30

15.4215.8916.3716.8517.35

15.4615.9316.4116.9017.40

15.5115.9816.4616.9517.45

15.5616.0316.5117.0017.50

15.6016.0816.5617.0517.55

15.6516.1216.6117.1017.60

4546474849

17.6518.1618.6819.2119.75

17.7018.2118.7319.2619.81

17.7518.2618.7919.3219.86

17.8018.3218.8419.3719.92

17.8518.3718.8919.4319.97

17.9118.4218.9519.4820.03

17.9618.4719.0019.5320.08

18.0118.5219.0519.5920.14

18.0618.5819.1019.6420.19

18.1118.6319.1619.7020.25

5051525354

20.3020.8621.4422.0222.61

20.3620.9221.4922.0822.68

20.4120.9821.5522.1422.74

20.4721.0321.6122.2022.80

20.5221.0921.6722.2622.86

20.5821.1521.7322.3222.92

20.6421.2121.7922.3822.98

20.6921.2621.8422.4423.04

20.7521.3221.9022.5023.10

20.8121.3821.9622.5623.16

5556575859

23.2223.8424.4825.1225.78

23.2823.9024.5425.1925.85

23.3423.9724.6125.2525.92

23.4124.0324.6725.3225.98

23.4724.1024.7425.3826.05

23.5324.1624.8025.4526.12

23.5924.2224.8625.5226.19

23.6524.2924.9325.5826.26

23.7224.3524.9925.6526.32

23.7824.4225.0625.7126.39

6061626364

26.4627.1527.8528.5729.31

26.5327.2227.9228.6429.38

26.6027.2927.9928.7229.46

26.6727.3628.0728.7929.53

26.7427.4328.1428.8729.61

26.8027.5028.2128.9429.68

26.8727.5728.2829.0129.76

26.9427.6428.3529.0929.83

27.0127.7128.4329.1629.91

27.0827.7828.5029.2429.98

6566676869

30.0630.8331.6232.4233.25

30.1430.9131.7032.5033.33

30.2130.9931.7832.5933.42

30.2931.0731.8632.6733.50

30.3731.1531.9432.7533.59

30.4431.2232.0232.8333.67

30.5231.3032.1032.9233.75

30.6031.3832.1833.0033.84

30.6831.4632.2633.0833.92

30.7531.5432.3433.1734.00

7071727374

34.0934.9535.8336.7437.66

34.1835.0435.9236.8337.75

34.2635.1336.0136.9237.85

34.3535.2136.1037.0237.94

34.4335.3036.1937.1138.04

34.5235.3936.2837.2038.13

34.6135.4836.3837.2938.23

34.6935.5736.4737.3838.32

34.7935.6536.5637.4838.42

34.8635.7436.6537.5738.51

7576777879

38.6139.5740.5741.5842.62

38.7139.6740.6741.6842.73

38.8039.7740.7741.7942.83

38.9039.8740.8741.8942.94

39.0039.9840.9742.0043.05

39.0940.0741.0742.1043.15

39.1940.1741.1842.2043.26

39.2840.2741.2842.3143.37

39.3840.3741.3842.4143.48

39.4740.4741.4842.5243.58

808182838485

43.6944.7845.9047.0448.2249.43

43.8044.8946.0147.1648.3449.55

43.9145.0046.1347.2848.4649.68

44.0245.1246.2447.3948.5849.80

44.1345.2346.3647.5148.7049.92

44.2345.3446.4747.6348.8250.04

44.3445.4546.5847.7548.9550.17

44.4545.5646.7047.8749.0750.29

44.5645.6846.8147.9849.1950.41

44.6745.7946.9348.1049.3150.54

EXPLANATION FOR USING DIRECT SELECTION TABLES

- 10 -

I. PREFACE TO DIRECT SELECTION TABLE NO. 4

Direct Selection Table No. 4 contains a complete and accurate compilation of data arranged for quick, easy selection of water cooling coils to prepare or-meet a specification.

The table covers the conditions normally encountered in the air conditioning range for 80 Fin Series Coils. Correction factors for Fin Series 70 100 and 120 are shown in Table No. 2, page 7.

In many cases a slight adjustment in the CFM, face area, water temperature rise, or percentage of fresh air introduced can materially reduce the time required to select a coil or group of coils.

Since Type KWS (single serpentine) Coils meet most requirements, the majority of values shown in the tables are for this coil type.

The color coil circuiting key for the Direct Selection Tables is as follows: blue-half serpentine; white-single serpentine; grey double serpentine. See Dimensional Drawings, page 31 for complete coil details.

In preparing Direct Selection Tables, the use of average correction factors has been avoided to prevent multiplying of errors which could result in poor coil selection. These tables could be within normally accepted test laboratory accuracy.

II. VARIABLES COVERED IN DIRECT SELECTION TABLE NO. 4

1. Values shown in Table No. 4 are for 80 Fin Series Coils.

2. Entering wet bulb temperatures from 64°F through 70°F in 3°F increments.

3. Face velocities from 400 ft. per min. through 600 ft. per min. in 25 ft. per min. increments.

4. Entering water temperatures of 40, 45 and 50°F.

5. Water temperature rises of 8 and 10°F.

6. Finned lengths from 24" through 120" in 12" increments.

7. Row detpths of 4, 6, and 8.

8. Capacity in terms of tons per sq. ft. and leaving wet bulb temperature.

Ill. LIMITATIONS OF CATALOG

1. All information contained in this catalog is based on water as the cooling fluid. For fluids other than water consult KeepRite Refrigeration.

2. Direct Selection Table No. 4 is based on 80 Fin Series Coils. Applicable correction factors for 70, 100, and 120 Fin Series Coils are shown on Table No. 2, page 7.

3. Interpolation between tables.

a. Interpolation between leaving wet bulb temperatures should not be attempted as the result will not be accurate.

b. Interpolation for performance values of Type KWS, KWH and KWD is not possible, since water velocities are vastly different. The different type coils are indicated in the tables by blue, grey and white.

c. Interpolation for 5 and 7 rows is permissible.

d. Interpolation for entering water temperatures is permissible.

e. Interpolation between water temperature rises of 8 and 10 degrees is permissible.

f. Interpolation between entering wet bulb temperature is permissible.

g. Interpolation between face velocities is permissible.

h. Interpolation between finned length is permissible.

i. Leaving wet bulb temperatures for other than 80 Fin Series Coils must be calculated.

4. Where use of Direct Selection Table No. 4 is not possible the coil size may be calculated as shown

in Example Problems No. 1 and 2 on pages, 21, 22 and 23.

5. Direct Selection Table No. 4 may not be used when S/ T ratio is .90 or greater.

- 11 -

EXPLANATION FOR USING DIRECT SELECTION TABLES

IV. USE OF DIRECT SELECTION TABLE NO.4

To determine row depth and finned length for a given

total load.

1. Before entering Direct Selection Table No. 4 it will be

necessary to know the following:

a. Coil face velocity. Calculate using Formula 8, or

assume 500 if unable to calculate or if not

specified.

b. Total tons per sq. ft.-Calculate using Formula 10

or leaving wet bulb temperature. If interpolation

of tables required, tons per sq. ft. must be

determined.

c. Leaving water temperature. Calculate using

Formula 2 when necessary.

2. Using the entering wet bulb temperature, entering

water temperature and leaving water temperature

find the proper page of Table No. 4.

3. Enter table at proper face velocity, read down to find

the value of tons per sq. ft. or leaving wet bulb

temperature most nearly meeting the requirement. It

is suggested that 4 row coils be checked first and if

insufficient the 6 and 8 rows be checked in turn.

Usually more than one selection is possible. Select

the coil having the fewest rows and the shortest

“NTL”. Since the coil height (“W” dimension) is

subsequently determined from the face area and

finned length keep the length height ratio in mind

when selecting the finned length from Table 4. Do

not overlook the possibility of using a higher or lower

fin series to more accurately match the capacity. In

many cases the higher fin series coil will reduce the

rows deep required. See Table 2, page 7 for fin

series correction factors to apply to the values of

tons per sq. ft. in Table No. 4.

4. Using the minimum required “NTL” and the minimum

coil face area find the minimum coil height

(“W” dimension) from Table 1, page 6.

5. Calculate leaving wet bulb temperature if not directly

readable from table.

6. Calculate the leaving dry bulb temperature using

Formula 3.

7. Determine water pressure drop as shown, page 29.

8. Determine air pressure drop as shown, page 29.

To determine capacity for a given coil.

1. Before entering table it will be necessary to know:

a. Coil face velocity. Calculate using Formula 8.

b. Coil “NTL”. Determine from Table 1, page 6.

c. Rows deep and fin series. (Would be

specified.)

d. Leaving water temperature-calculate using

Formula 2.

2. Using the entering wet bulb temperature entering water

temperature and leaving water temperature, find proper

page in Table No. 4.

3. Enter table in proper coil face velocity column, “NTL”

and row depth. Read capacity in terms of tons per sq.

ft. or leaving wet bulb temperature. If the given coil

is single serpentine and tables values are given for

KWH or KWD Type Coils, follow trial and error

procedure outlined in problems 1 and 2. For other than

80 Fin Series Coils multiply the value in tons per sq. ft.

from Table No. 4 by the fin series correction factor

(Table 2, page 7).

4. Calculate leaving wet bulb if not directly readable from

table.

5. Calculate leaving dry bulb temperature using

Formula 3.

6. Calculate water pressure drop as shown, page 30.

7. Calculate air pressure drop as shown, page 29.

DIRECT SELECTION64°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 48°F, LEAVING WATER

TABLE 4

- 12 -

67°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 48°F, LEAVING WATER

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.101.411.65

52.949.346.3

1.131.481.73

53.349.546.5

1.161.541.82

53.751.646.7

1.191.611.89

54.049.947.0

1.221.681.98

54.350.147.1

1.251.752.06

54.650.247.3

1.281.812.14

54.850.447.5

1.311.882.22

55.050.547.6

1.341.942.29

55.250.747.8

36"468

1.161.501.71

52.248.245.5

1.201.561.79

52.648.745.8

1.251.631.88

52.848.846.0

1.291.701.97

53.149.046.1

1.341.772.06

53.249.246.3

1.381.842.14

53.549.446.5

1.421.902.22

53.749.646.7

1.471.972.30

53.849.846.9

1.512.042.39

54.049.947.0

48"468

1.211.541.75

51.647.644.9

1.261.611.83

51.948.045.3

1.311.681.92

52.248.345.5

1.361.752.01

52.448.545.7

1.411.832.11

52.648.645.8

1.471.902.19

52.748.846.1

1.511.972.27

53.049.046.3

1.562.052.36

53.149.146.4

1.602.122.45

53.349.246.5

60"468

1.251.571.77

51.247.344.7

1.301.641.86

51.547.645.0

1.351.721.95

51.847.845.2

1.411.792.05

51.948.145.3

1.471.872.14

52.048.245.5

1.521.952.22

52.348.445.7

1.572.022.30

25.548.646.0

1.622.102.39

52.648.746.1

1.672.172.48

52.848.846.2

72"468

1.281.591.79

50.847.044.4

1.341.671.88

51.147.344.7

1.391.741.98

51.447.644.8

1.451.822.07

51.547.845.1

1.511.902.16

51.747.945.3

1.561.982.15*

51.948.146.4*

1.622.062.23*

52.048.246.7*

1.672.132.32*

52.248.446.7*

1.722.03*2.40*

52.449.9*46.9*

84"468

1.301.611.80

50.646.844.3

1.361.691.90

50.847.044.5

1.421.772.00

51.147.244.6

1.481.842.00*

51.247.545.8*

1.531.922.09*

51.547.746.0*

1.591.90*2.18*

51.648.8*46.1*

1.651.95*2.26*

51.849.2*46.4*

1.702.01*2.35*

52.049.4*46.5*

1.762.08*2.43*

52.149.6*46.7*

96"468

1.311.621.81

50.546.744.1

1.371.701.83*

50.746.945.3*

1.431.781.92*

50.947.145.5*

1.491.76*2.02*

51.148.4*45.6*

1.551.83*2.11*

51.348.6*45.8*

1.47*1.91*2.20*

52.7*48.7*45.9*

1.52*1.98*2.28*

52.9*48.9*46.2*

1.57*2.05*2.37*

53.0*49.1*46.3*

1.61*2.12*2.46*

53.2*49.2*46.4*

108"468

1.22*1.56*1.75*

51.5*47.4*44.9*

1.29*1.63*1.85*

51.6*47.8*45.1*

1.34*1.71*1.94*

51.9*47.9*45.3*

1.40*1.78*2.04*

52.0*48.2*45.4*

1.46*1.86*2.13*

52.1*48.3*45.6*

1.50*1.93*2.22*

52.4*48.5*45.7*

1.55*2.01*2.31*

52.6*48.7*45.9*

1.59*2.08*2.40*

52.9*48.8*46.0*

1.64*2.15*2.49*

53.0*49.0*46.1*

120"468

1.23*1.57*1.77*

51.4*47.3*44.7*

1.30*1.64*1.87*

51.5*47.6*44.9*

1.35*1.72*1.96*

51.8*47.8*45.1*

1.41*1.80*2.05*

51.9*48.0*45.3*

1.48*1.88*2.15*

52.0*48.1*45.4*

1.52*1.95*2.24*

52.3*48.4*45.5*

1.57*2.03*2.33*

52.5*48.5*45.7*

1.62*2.11*2.42*

52.6*48.6*45.9*

1.67*2.18*2.50*

52.8*48.7*46.0*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonspert. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.251.701.98

55.150.046.5

1.321.772.07

55.250.446.9

1.381.852.17

55.450.647.9

1.441.932.26

55.550.847.5

1.502.012.35

55.651.147.8

1.562.082.44

55.851.348.0

1.622.162.53

55.951.548.2

1.682.242.62

56.051.648.5

1.732.312.71

56.151.848.7

36"468

1.361.792.04

53.948.945.7

1.421.872.14

54.149.346.1

1.491.952.24

54.349.546.3

1.552.032.34

54.549.846.6

1.612.122.44

54.750.046.9

1.682.202.54

54.850.346.1

1.742.282.64

54.950.547.3

1.802.362.73

55.150.747.5

1.852.442.83

55.350.847.6

48"468

1.431.842.08

53.148.245.2

1.491.932.18

53.448.545.5

1.552.012.28

53.748.945.9

1.612.102.38

53.949.146.2

1.692.182.49

54.049.546.3

1.762.272.59

54.149.646.6

1.822.352.70

54.349.946.7

1.882.442.80

54.550.046.9

1.942.522.90

54.650.247.1

60"468

1.491.882.10

52.447.744.9

1.551.972.20

52.848.145.3

1.622.052.31

53.048.445.5

1.682.142.41

53.348.745.8

1.752.222.53

53.449.045.9

1.812.312.62

53.749.246.3

1.882.402.74

53.849.446.3

1.942.492.84

54.049.646.5

2.002.572.94

54.249.846.7

72"468

1.521.902.11

52.147.544.8

1.591.992.22

52.447.845.1

1.662.072.33

52.648.245.3

1.712.162.36*

53.048.546.3*

1.792.252.46*

53.148.846.7*

1.852.342.55*

53.348.947.0*

1.922.432.65*

53.549.147.2*

1.982.522.75*

53.749.347.3*

2.042.612.84*

53.949.547.5*

84"468

1.551.912.06*

51.747.445.5*

1.622.002.17*

52.047.745.7*

1.682.082.27*

52.448.246.0*

1.742.172.37*

52.748.446.3*

1.812.16*2.48*

52.949.7*46.4*

1.872.25*2.58*

53.249.8*46.7*

1.942.33*2.68*

53.350.0*46.9*

2.012.41*2.78*

53.550.3*47.1*

2.072.50*2.88*

53.650.3*47.2*

96"468

1.561.84*2.07*

51.648.2*45.3*

1.631.92*2.18*

51.948.7*45.5*

1.692.00*2.28*

52.349.0*45.9*

1.762.09*2.39*

52.549.2*46.1*

1.72*2.18*2.50*

53.7*49.4*46.3*

1.79*2.27*2.60*

53.8*49.6*46.5*

1.85*2.35*2.70*

54.1*49.9*46.7*

1.91*2.43*2.80*

54.3*50.1*46.9*

1.96*2.52*2.91*

54.5*50.2*46.9*

108"468

1.49*1.85*2.08*

52.4*48.1*45.2*

1.55*1.93*2.19*

52.8*48.5*45.4*

1.61*2.02*2.30*

53.1*48.8*45.6*

1.67*2.11*2.41*

53.4*49.0*45.8*

1.74*2.20*2.52*

53.5*49.3*46.0*

1.80*2.29*2.62*

53.8*49.4*46.3*

1.87*2.38*2.72*

53.9*49.6*46.5*

1.93*2.46*2.83*

54.1*49.8*45.6*

1.98*2.55*2.94*

54.3*49.9*46.7*

120"468

1.50*1.86*2.09*

52.3*48.0*45.0*

1.57*1.94*2.20*

52.6*48.4*45.3*

1.63*2.03*2.31*

52.9*48.7*45.5*

1.69*2.12*2.42*

53.2*48.9*45.7*

1.75*2.22*2.53*

53.4*49.1*45.9*

1.82*2.31*2.63*

53.6*49.2*46.2*

1.89*2.40*2.73*

53.7*49.4*46.4*

1.95*2.48*2.84*

53.9*49.7*46.5*

2.00*2.57*2.95*

54.2*49.8*46.6*

- 13 -

70°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 48°F, LEAVING WATER

TABLE 4 - cont.

64°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 53°F, LEAVING WATER

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.

°F.

24"468

1.512.002.31

56.350.847.0

1.582.102.44

56.551.147.1

1.652.192.57

56.751.447.3

1.722.292.68

56.951.647.6

1.782.382.79

57.251.948.0

1.842.472.90

57.452.248.3

1.912.563.01

57.652.448.5

1.972.653.12

57.752.648.8

2.032.743.23

57.952.848.9

36"468

1.612.102.37

55.249.646.3

1.682.202.51

55.550.046.3

1.762.302.64

55.750.346.5

1.832.402.76

55.950.546.8

1.912.502.88

56.150.847.1

1.982.593.00

56.351.147.3

2.052.693.11

56.551.347.6

2.132.793.23

56.651.547.8

2.202.883.34

56.751.748.0

48"468

1.682.162.41

54.448.945.7

1.762.262.55

54.749.345.9

1.842.372.68

54.949.546.1

1.922.472.81

55.149.846.2

2.002.572.93

55.350.146.6

2.072.673.06

55.650.446.8

2.142.773.18

55.850.647.0

2.232.873.30

55.950.947.2

2.302.963.41

56.051.147.4

60"468

1.732.192.44

53.948.545.3

1.812.302.58

54.248.845.5

1.902.412.71

54.349.145.7

1.982.522.84

54.649.345.9

2.062.632.96

54.849.646.3

2.142.732.97*

55.049.847.6*

2.202.833.08*

55.350.147.9*

2.302.923.19*

55.350.548.2*

2.373.003.30*

55.550.848.4*

72"468

1.772.202.38*

53.448.446.1*

1.862.312.51*

53.748.746.3*

1.942.422.63*

54.049.046.6*

2.032.542.76*

54.149.146.8*

2.112.662.88*

54.349.347.1*

2.192.60*3.00*

54.651.0*47.3*

2.252.69*3.11*

54.951.3*47.6*

2.342.79*3.23*

55.051.5*47.8*

2.422.88*3.34*

55.251.7*48.0*

84"468

1.802.13*2.39*

53.149.2*46.0*

1.892.24*2.53*

53.349.5*46.1*

1.982.35*2.65*

53.649.7*46.4*

2.062.45*2.78*

53.850.0*46.6*

2.142.54*2.91*

54.150.4*46.8*

2.212.64*3.03*

54.450.7*47.0*

2.272.74*3.14*

54.850.9*47.4*

2.20*2.84*3.26*

56.1*51.1*47.6*

2.26*2.93*3.37*

56.3*51.4*47.8*

96"468

1.822.16*2.41*

52.948.9*45.7*

1.912.26*2.54*

53.149.3*46.0*

2.002.37*2.67*

53.449.5*46.2*

2.082.48*2.80*

53.649.7*46.4*

2.04*2.57*2.93*

55.0*50.1*46.6*

2.11*2.67*3.06*

55.3*50.4*46.7*

2.17*2.77*3.17*

55.6*50.6*47.0*

2.24*2.87*3.29*

55.8*50.9*47.3*

2.30*2.97*3.40*

56.0*51.0*47.5*

108"468

1.77*2.18*2.42*

53.4*48.6*45.6*

1.84*2.28*2.55*

53.9*49.1*45.9*

1.91*2.39*2.69*

54.3*49.3*46.0*

1.98*2.50*2.82*

54.6*49.5*46.2*

2.05*2.60*2.95*

54.9*49.8*46.4*

2.12*2.70*3.08*

55.2*50.1*46.6*

2.19*2.80*3.19*

55.4*50.4*46.9*

2.26*2.90*3.32*

55.6*50.6*47.0

2.33*3.00*3.43*

55.8*50.8*47.3*

120"468

1.78*2.19*2.43*

53.3*48.5*45.4*

1.85*2.29*2.57*

53.8*48.9*45.6*

1.92*2.40*2.70*

54.1*49.2*45.8*

1.99*2.51*2.83*

54.5*49.4*46.1*

2.06*2.61*2.96*

54.8*49.8*46.3*

2.13*2.72*3.09*

55.1*49.9*46.4*

2.20*2.82*3.21*

55.2*50.2*46.7*

2.28*2.92*3.33*

55.5*50.5*46.9*

2.35*3.02*2.44*

55.7*50.6*47.2*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsper. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.

°F.

24"468

.91†1.041.25

55.0†53.651.2

.95†1.091.31

55.2†53.751.4

.98†1.131.37

55.5†54.051.6

1.01†1.181.43

55.7†54.151.7

1.04†1.221.48

55.9†54.352.0

1.07†1.271.54

56.1†54.452.1

1.11†1.311.60

56.1†54.652.2

.931.351.66

57.854.752.3

.961.391.72

57.954.852.4

36"468

.831.121.32

55.952.750.4

.861.171.38

56.152.950.6

.891.221.44

56.353.150.8

.921.271.51

56.553.350.9

.961.321.57

56.653.451.1

.991.381.63

56.753.551.3

1.021.431.69

56.853.651.4

1.051.481.75

56.953.751.6

1.081.531.81

57.053.851.7

48"468

.891.171.36

55.352.149.9

.921.221.42

55.552.450.2

.961.281.49

55.652.550.3

1.001.331.55

55.852.750.5

1.031.391.62

56.052.850.7

1.071.441.68

56.153.050.8

1.101.501.75

56.253.050.9

1.141.561.81

56.353.151.1

1.171.601.88

56.453.351.2

60"468

.931.201.38

54.851.849.6

.971.251.45

55.052.049.8

1.011.311.51

55.252.250.1

1.051.371.58

55.352.350.2

1.091.421.65

55.552.550.4

1.121.471.72

55.752.750.5

1.161.531.79

55.752.850.8

1.201.591.85

55.852.950.8

1.241.641.92

55.953.050.8

72"468

.961.231.40

54.551.443.9

1.001.281.47

54.751.743.9

1.041.341.54

54.951.949.8

1.081.391.61

55.052.149.9

1.121.451.68

55.252.250.1

1.161.501.75

55.352.450.2

1.201.561.82

55.452.550.3

1.241.621.89

55.652.650.4

1.281.671.96

55.652.850.5

84"468

.981.251.42

54.351.243.9

1.021.301.49

54.551.549.4

1.061.361.56

54.751.749.6

1.101.411.63

54.951.949.7

1.151.471.70

54.952.149.9

1.191.531.78

55.152.249.9

1.231.591.85

55.252.350.1

1.271.641.80*

55.352.551.2*

1.311.701.86*

55.452.551.3*

96"468

1.001.261.43

54.051.149.0

1.041.321.50

54.351.349.3

1.081.381.57

54.551.549.5

1.131.431.65

54.351.749.5

1.171.491.63*

54.751.950.6*

1.221.551.69*

54.852.050.8*

1.261.611.76*

55.052.150.8*

1.301.661.82*

55.152.351.0*

1.341.61*1.88*

55.253.2*51.2*

108"468

1.021.271.44

53.850.948.9

1.061.331.44*

54.151.249.9*

1.101.391.50*

54.351.450.2*

1.151.441.57*

54.451.650.3*

1.191.42*1.65*

54.652.5*50.4*

1.241.47*1.71*

54.752.7*50.6*

1.281.53*1.78*

54.852.8*50.7*

1.321.58*1.84*

55.052.9*50.8*

1.23*1.63*1.90*

56.0*53.1*51.0*

120"468

1.031.281.38*

53.750.849.6*

1.071.341.45*

54.051.149.8*

1.111.32*1.51*

54.252.0*50.1*

1.161.37*1.58*

54.352.3*50.2*

1.201.43*1.66*

54.552.4*50.3*

1.251.48*1.72*

54.652.6*50.5*

1.291.54*1.79*

54.752.7*50.6*

1.331.59*1.85*

54.952.9*54.8*

1.25*1.65*1.91*

55.9*52.9*50.9*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 14 -

70°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 53°F, LEAVING WATER

67°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 53°F, LEAVING WATER

TABLE 4 - cont.Face Velocity

FPM400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

24"468

1.141.321.57

56.354.351.5

.981.381.65

58.354.651.7

1.021.431.72

58.754.952.0

1.061.491.79

58.855.052.2

1.101.551.87

59.055.252.4

1.141.601.94

59.155.452.6

1.181.662.02

59.255.652.7

1.221.712.09

59.355.752.8

1.261.772.16

59.355.953.0

36"468

1.051.411.64

57.253.350.7

1.101.471.72

57.453.650.9

1.141.531.80

57.653.951.1

1.181.591.88

57.854.151.3

1.221.661.96

58.054.251.5

1.271.722.04

58.154.451.7

1.311.782.13

58.254.651.8

1.351.842.21

58.454.851.9

1.401.902.29

58.455.052.0

48"468

1.121.461.68

56.552.850.2

1.161.531.76

56.853.050.5

1.211.591.84

56.953.350.7

1.261.651.93

57.153.650.8

1.301.722.01

57.353.751.1

1.351.782.10

57.453.951.2

1.391.852.18

57.654.151.3

1.441.912.27

57.754.251.4

1.491.982.35

57.854.351.5

60"468

1.161.491.71

56.152.449.8

1.201.561.79

56.452.750.2

1.251.631.88

56.652.950.3

1.301.691.97

56.753.250.4

1.341.762.05

57.053.450.7

1.391.832.13

57.153.550.9

1.441.892.22

57.353.751.0

1.491.962.30

57.453.951.1

1.542.032.38

57.553.951.3

72"468

1.191.521.73

55.752.149.6

1.231.591.81

56.152.349.9

1.281.661.90

56.352.650.1

1.331.721.99

56.552.950.2

1.381.792.07

56.753.150.1

1.431.862.16

56.853.350.6

1.491.922.12*

56.953.551.8*

1.541.992.21*

57.053.651.9*

1.592.062.29*

57.153.752.0*

84"468

1.211.541.74

55.551.849.5

1.261.611.82

55.852.149.8

1.311.681.83*

56.052.450.8*

1.361.741.91*

56.252.751.1*

1.411.811.99*

56.452.951.2*

1.461.882.07*

56.653.151.4*

1.521.84*2.15*

56.654.1*51.6*

1.571.90*2.23*

56.854.3*51.7*

1.621.97*2.31*

56.954.4*51.8*

96"468

1.231.551.68*

55.351.750.2*

1.281.621.76*

55.652.050.5*

1.331.60*1.85*

55.853.2*50.6*

1.391.66*1.93*

56.053.5*50.8*

1.441.73*2.01*

56.253.6*51.1*

1.491.79*2.09*

56.353.8*51.3*

1.541.86*2.17*

56.554.0*51.4*

1.591.92*2.25*

56.654.2*51.6*

1.621.99*2.33*

56.754.3*51.7*

108"468

1.241.49*1.70*

55.252.4*50.1*

1.291.54*1.78*

55.552.9*50.3*

1.341.61*1.86*

55.853.1*50.5*

1.401.68*1.94*

55.953.3*50.7*

1.451.75*2.03*

56.153.4*50.9*

1.40*1.81*2.11*

57.1*53.7*51.1*

1.45*1.88*2.19*

57.2*53.8*51.3*

1.50*1.94*2.27*

57.3*54.0*51.4*

1.55*2.01*2.35*

57.4*54.1*51.5*

120"468

1.251.50*1.71*

55.152.3*49.8*

1.301.56*1.79*

55.452.7*50.2*

1.27*1.63*1.87*

56.4*52.9*50.4*

1.32*1.69*1.95*

56.6*53.2*50.6*

1.37*1.76*2.04*

56.7*53.4*50.8*

1.42*1.82*2.12*

56.9*53.6*51.0*

1.47*1.89*2.20*

51.0*53.7*51.1*

1.52*1.95*2.29*

57.1*53.9*51.2*

1.57*2.02*2.37*

57.2*54.0*51.4*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

24"468

1.201.621.90

59.455.151.9

1.251.702.00

59.755.352.2

1.301.772.09

59.955.652.4

1.351.842.19

60.155.952.6

1.391.912.28

60.356.152.8

1.431.982.36

60.556.353.1

1.482.052.45

60.756.553.3

1.522.122.54

60.856.653.5

1.562.192.62

61.056.853.7

36"468

1.331.711.98

58.154.151.0

1.381.812.10

58.554.251.1

1.431.892.20

58.754.451.3

1.491.972.30

58.954.751.5

1.542.052.39

59.154.951.8

1.592.122.48

59.355.152.1

1.642.202.57

59.555.352.3

1.692.272.66

59.755.552.5

1.742.342.74

59.855.752.8

48"468

1.391.762.02

57.553.550.5

1.441.862.13

57.953.650.7

1.501.942.24

58.153.950.9

1.562.022.34

58.354.251.1

1.612.112.44

58.654.351.3

1.672.192.53

58.754.651.6

1.722.262.63

58.954.951.8

1.782.332.72

59.155.152.1

1.832.412.81

59.255.252.3

60"468

1.421.792.04

57.253.250.3

1.481.892.15

57.553.350.5

1.541.972.26

57.853.650.7

1.602.062.36

57.953.850.9

1.662.152.47

58.254.051.1

1.722.222.57

58.454.351.3

1.782.302.67

58.554.551.5

1.832.382.59*

58.754.753.1*

1.892.452.71*

58.955.053.0*

72"468

1.451.812.06

56.953.050.1

1.511.902.16

57.253.250.4

1.571.992.18*

57.553.551.5*

1.632.082.28*

57.753.651.7*

1.702.172.38*

57.853.851.9*

1.762.13*2.47*

58.055.1*52.2*

1.812.20*2.57*

58.355.3*52.3*

1.872.28*2.65*

58.455.5*52.6*

1.932.35*2.74*

58.655.7*52.8*

84"468

1.471.831.99*

56.752.850.9*

1.531.83*2.11*

57.054.0*51.0*

1.601.91*2.21*

57.254.2*51.2*

1.661.99*2.31*

57.454.5*51.4*

1.732.07*2.41*

57.654.7*51.6*

1.792.15*2.50*

57.854.9*51.9*

1.842.23*2.59*

58.155.1*52.2*

1.912.31*2.68*

58.255.3*52.4*

1.82*2.38*2.77*

52.3*55.5*52.6*

96"468

1.491.76*2.01*

56.553.5*50.7*

1.551.84*2.12*

56.853.9*50.9*

1.611.93*2.22*

57.154.0*51.1*

1.672.01*2.33*

57.354.3*51.2*

1.63*2.09*2.43*

58.4*54.5*51.4*

1.69*2.18*2.53*

58.6*54.7*51.6*

1.74*2.26*2.62*

58.8*54.9*51.9*

1.80*2.34*2.71*

58.9*55.0*52.1*

1.84*2.41*2.80*

59.2*55.2*52.4*

108"468

1.41*1.77*2.02*

57.3*53.4*50.5*

1.47*1.86*2.13*

57.6*53.6*50.7*

1.54*1.95*2.24*

57.8*53.9*50.9*

1.60*2.04*2.35*

57.9*54.0*51.0*

1.66*2.13*2.45*

58.2*54.251.2*

1.72*2.21*2.55*

58.4*54.4*51.5*

1.77*2.30*2.65*

58.6*54.5*51.6*

1.82*2.37*2.75*

58.8*54.8*51.8*

1.86*2.44*2.83*

59.0*55.0*52.1*

120"468

1.43*1.78*2.03*

57.1*53.3*50.4*

1.50*1.88*2.14*

57.3*53.4*50.6*

1.57*1.98*2.25*

57.5*53.6*50.9*

1.63*2.07*2.36*

57.7*53.8*50.9*

1.69*2.16*2.47*

57.9*53.9*51.1*

1.74*2.22*2.57*

58.2*54.1*51.3*

1.79*2.33*2.67*

58.4*54.3*51.5*

1.84*2.40*2.77*

57.8*54.5*51.6*

1.87*2.46*2.85*

59.0*54.9*52.0*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 15 -

64°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 58°F, LEAVING WATER

TABLE 4 - cont.

67°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 58°F, LEAVING WATER

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

24"468

.67†

.83†

.99†

57.6†55.3†54.1†

.68†

.86†1.04†

57.9†56.1†54.3†

.69†

.89†.95

58.1†56.3†55.7

.70†

.82†1.00

58.4†56.5†55.8

.71†

.96†1.04

58.6†56.6†55.9

.73†1.00†1.07

58.7†56.6†56.1

.75†1.04†1.11

58.8†56.7†56.1

.78†1.03†1.15

58.9†56.8†56.2

.81†.94

1.18

58.9†58.056.4

36"468

.69†.79.94

57.4†56.354.7

.71†.82.99

57.6†56.554.8

.73†.86

1.03

57.8†56.655.0

.63

.891.08

59.056.755.0

.65

.931.13

59.156.855.1

.67

.961.17

59.256.355.2

.69

.991.22

59.357.155.3

.711.031.26

59.357.155.4

.731.061.30

59.457.255.5

48"468

.61

.83

.98

58.255.954.3

.64

.871.03

58.356.054.4

.67

.911.08

58.356.154.5

.70

.951.13

58.456.254.6

.72

.991.18

58.556.354.6

.751.021.22

58.656.454.8

.781.061.27

58.656.554.9

.801.101.31

58.756.655.0

.821.131.36

58.856.755.1

60"468

.65

.861.01

57.855.653.9

.68

.901.06

57.955.754.1

.71

.951.11

58.055.754.2

.74

.991.17

58.055.954.2

.771.031.22

58.156.054.3

.801.071.26

58.256.154.5

.821.101.31

58.356.254.6

.841.131.35

58.456.454.7

.871.161.39

58.556.554.9

72"468

.68

.891.03

57.555.253.7

.71

.931.08

57.655.453.9

.74

.981.13

57.755.554.0

.771.021.18

57.855.654.1

.801.061.24

57.955.754.1

.831.101.28

58.055.854.3

.861.131.33

58.056.054.4

.881.161.38

58.256.154.5

.911.191.43

58.256.354.6

84"468

.70

.911.04

57.355.053.6

.73

.951.09

57.455.253.8

.761.001.15

57.555.353.8

.791.041.20

57.655.453.9

.821.081.25

57.755.554.0

.851.121.30

57.855.654.1

.881.161.35

57.955.754.3

.911.191.40

58.055.954.3

.931.221.44

58.156.154.5

96"468

.72

.921.05

57.154.953.5

.75

.961.10

57.255.153.6

.781.011.16

57.355.253.7

.811.061.21

57.455.253.8

.841.101.26

57.555.353.9

.871.141.31

57.655.554.1

.901.181.36

57.755.654.2

.921.211.41

57.955.854.3

.951.241.46

57.955.954.3

108"468

.73

.931.06

56.954.853.4

.76

.981.11

57.154.953.5

.801.021.17

57.155.153.6

.831.071.22

57.355.153.7

.861.111.28

57.455.353.8

.891.161.32

57.555.354.0

.921.201.37

57.655.454.1

.951.231.42

57.755.654.2

.971.261.47

57.855.854.3

120"468

.74

.931.06

56.854.853.4

.76

.981.12

57.154.953.4

.801.031.17

57.155.053.6

.841.071.23

57.255.153.6

.871.121.28

57.355.253.8

.901.171.33

57.455.253.9

.931.211.30

57.555.454.7

.951.251.35

57.755.554.7

.981.281.40

57.755.654.8

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

24"468

.79†1.04†1.27†

59.9†57.3†54.9†

.82†1.09†1.33†

60.0†57.5†55.1†

.85†1.15†1.26

60.2†57.5†56.5

.88†1.21†1.31

60.3†57.6†56.7

.91†1.26†1.36

60.4†57.7†56.8

.94†1.32†1.41

60.6†57.7†57.0

.97†1.37†1.46

60.7†57.8†57.1

1.00†1.42†1.52

60.8†57.8†57.2

1.03†1.231.56

60.8†59.557.5

36"468

.86†1.031.22

59.1†57.455.4

.90†1.091.28

59.3†57.555.6

.93†1.141.34

59.5†57.655.7

.831.191.40

60.757.755.9

.861.231.46

60.857.956.0

.891.271.52

60.958.156.1

.921.301.57

61.058.356.3

.941.341.63

61.258.456.4

.971.371.69

61.258.656.4

48"468

.801.071.26

59.757.055.0

.831.121.32

60.057.255.2

.861.161.38

60.157.455.4

.891.211.45

60.257.555.4

.921.261.51

60.357.755.6

.951.301.57

60.557.855.7

.981.351.63

60.657.955.8

1.011.401.69

60.758.055.9

1.041.441.75

60.858.256.0

60"468

.831.101.29

59.556.754.7

.861.151.35

59.756.954.9

.901.201.41

59.857.055.1

.931.251.48

59.957.255.2

.971.301.54

60.057.355.3

1.001.341.60

60.157.555.4

1.031.391.67

60.257.655.5

1.071.441.73

60.357.755.6

1.101.491.79

60.457.855.7

72"468

.871.141.31

59.256.354.4

.901.191.38

59.356.554.6

.941.241.44

59.456.754.8

.971.281.50

59.656.955.0

1.011.331.57

59.757.155.1

1.041.381.63

59.857.255.2

1.081.431.69

59.957.355.3

1.111.481.76

60.057.455.4

1.151.531.82

60.157.555.5

84"468

.881.151.32

59.056.254.3

.921.201.39

59.156.454.5

.961.251.45

59.256.654.7

1.001.301.52

59.356.854.8

1.041.361.59

59.456.854.9

1.071.401.65

59.657.155.0

1.111.451.71

59.757.255.2

1.151.501.78

59.757.355.2

1.191.551.84

59.857.455.4

96"468

.901.161.33

58.756.154.2

.941.211.40

58.956.354.4

.981.271.47

59.056.454.5

1.021.321.54

59.256.654.6

1.061.381.61

59.356.754.7

1.091.421.57*

59.556.955.7*

1.131.471.63*

59.557.055.8*

1.171.521.69*

59.657.155.9*

1.211.571.75*

59.757.356.0*

108"468

.921.171.34

58.655.954.1

.961.241.41

58.756.054.3

1.001.291.47

58.956.254.5

1.041.351.47*

59.056.355.3*

1.081.401.53*

59.156.555.4*

1.111.34*1.59*

59.357.5*55.5*

1.151.39*1.65*

59.457.6*55.6*

1.191.44*1.71*

59.557.7*55.8*

1.231.49*1.77*

59.657.8*55.9*

120"468

.931.181.29*

58.555.854.7*

.971.241.35*

58.656.054.9*

1.011.291.41*

58.856.255.1*

1.051.351.48*

58.956.355.2*

1.091.31*1.54*

59.057.2*55.3*

1.131.36*1.60*

59.157.4*55.4*

1.171.41*1.66*

59.357.5*55.6*

1.211.46*1.73*

59.357.6*55.6*

1.251.51*1.79*

59.457.7*55.7*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 16 -

64°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 50°F, LEAVING WATER

70°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 58°F, LEAVING WATER

TABLE 4 - cont.Face Velocity

FPM400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.04†1.231.43

61.0†59.257.1

1.09†1.291.52

61.1†59.357.1

1.14†1.341.60

61.3†59.557.2

1.19†1.391.68

61.4†59.757.3

1.23†1.451.75

61.5†59.957.4

1.27†1.501.82

61.7†60.057.6

1.32†1.551.89

61.8†60.257.7

1.36†1.601.95

61.9†60.357.9

1.40†1.652.02

62.0†60.458.0

36"468

1.031.301.55

61.158.455.9

1.061.361.63

61.458.756.1

1.091.431.70

61.758.756.3

1.111.491.78

62.058.956.4

1.141.551.86

62.259.156.5

1.171.611.94

62.459.256.6

1.201.672.01

62.659.356.8

1.231.732.09

62.859.456.9

1.261.792.17

62.959.557.0

48"468

1.051.361.60

60.957.855.3

1.091.421.68

61.158.155.6

1.131.481.76

61.358.355.7

1.171.551.83

61.558.456.0

1.211.611.91

61.758.656.1

1.251.671.99

61.858.756.2

1.291.732.07

62.058.956.4

1.331.802.14

62.159.056.5

1.371.862.14

62.059.156.6

60"468

1.081.381.63

60.657.655.0

1.131.451.71

60.857.855.2

1.181.521.79

60.957.955.4

1.221.581.87

61.158.255.6

1.271.651.94

61.258.355.9

1.311.722.02

61.458.456.0

1.361.782.10

61.558.556.1

1.401.852.18

61.658.656.2

1.441.912.26

61.858.756.4

72"468

1.101.401.64

60.457.455.0

1.161.471.72

60.557.655.1

1.211.541.80

60.757.855.3

1.261.611.88

60.857.955.5

1.311.681.96

60.958.055.7

1.361.752.04

61.058.155.8

1.401.822.12

61.258.255.9

1.451.882.20

61.358.456.1

1.491.952.28

61.558.556.2

84"468

1.131.431.67

60.157.154.6

1.181.501.75

60.357.354.8

1.231.571.83

60.557.555.0

1.281.641.91

60.657.655.2

1.331.711.87*

60.857.856.4*

1.381.781.95*

60.957.956.6*

1.431.852.02*

61.058.056.7*

1.471.922.10*

61.258.156.8*

1.521.82*2.18*

61.359.3*56.9*

96"468

1.151.451.68

59.956.954.5

1.201.521.67*

60.157.155.6*

1.251.591.75*

60.357.355.8*

1.301.661.82*

60.557.556.1*

1.351.63*1.90*

60.658.4*56.2*

1.401.68*1.97*

60.858.7*56.4*

1.451.74*2.05*

60.958.8*56.5*

1.491.79*2.12*

61.059.0*56.7*

1.541.84*2.20*

61.159.2*56.8*

108"468

1.161.461.61*

59.856.855.2*

1.221.46*1.69*

60.057.7*55.4*

1.271.52*1.76*

60.157.9*55.7*

1.321.59*1.84*

60.358.1*55.9*

1.371.65*1.92*

60.558.3*56.0*

1.421.71*1.99*

60.658.4*56.2*

1.461.77*2.07*

60.858.6*56.4*

1.38*1.83*2.15*

61.8*58.7*56.5*

1.42*1.88*2.22*

61.9*58.9*56.6*

120"468

1.171.39*1.62*

59.857.6*55.1*

1.221.46*1.70*

60.057.7*55.3*

1.281.53*1.78*

60.157.8*55.5*

1.331.60*1.86*

60.258.0*55.7*

1.28*1.66*1.94*

61.2*58.2*55.8*

1.32*1.72*2.02*

61.3*58.4*56.0*

1.36*1.79*2.10*

61.5*58.4*56.1*

1.41*1.85*2.17*

61.6*58.6*56.3*

1.45*1.91*2.24*

61.7*58.7*56.3*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.12†1.301.56

52.6†50.547.4

1.17†1.361.69

52.9†50.847.6

1.21†1.421.71

53.2†51.047.9

1.26†1.471.79

53.4†51.348.1

1.31†1.531.86

53.5†51.548.3

1.35†1.581.93

53.7†51.748.5

1.40†1.632.00

53.8†51.948.7

1.45†1.692.07

53.9†52.048.9

1.50†1.762.16

54.0†52.149.0

36"468

1.061.411.65

53.349.246.3

1.101.481.73

53.649.446.5

1.151.561.81

53.849.746.8

1.191.611.90

54.049.947.0

1.231.681.97

54.250.147.2

1.271.742.06

54.450.347.4

1.301.802.12

54.650.547.6

1.351.862.20

54.750.747.8

1.401.932.28

54.850.848.0

48"468

1.151.491.70

52.548.445.7

1.191.541.78

52.748.745.9

1.231.611.87

53.049.046.1

1.271.681.95

53.249.246.3

1.331.752.02

53.449.446.5

1.361.822.12

53.649.646.7

1.401.882.20

53.849.846.9

1.441.942.28

54.050.047.1

1.502.012.35

54.150.147.3

60"468

1.171.511.72

52.148.145.4

1.221.581.80

52.348.345.6

1.281.661.90

52.548.545.7

1.331.732.00

52.748.745.9

1.381.802.08

52.948.946.1

1.431.882.18

53.149.146.3

1.471.932.24

53.349.346.5

1.512.002.32

53.549.546.7

1.562.062.40

53.649.746.9

72"468

1.201.521.73

51.847.845.2

1.251.601.82

52.048.045.4

1.311.681.91

52.248.245.6

1.361.762.00

52.448.445.7

1.411.832.10

52.648.645.9

1.461.902.19

52.848.846.1

1.501.972.26

53.049.046.3

1.562.032.34

53.149.246.5

1.622.102.44

53.249.446.6

84"468

1.221.541.75

51.647.645.0

1.271.621.84

51.847.845.2

1.331.701.93

52.048.045.4

1.391.782.10

52.148.245.6

1.441.852.11

52.348.445.8

1.491.912.19

52.548.746.0

1.541.982.28

52.748.946.2

1.602.052.25*

52.849.147.3*

1.642.112.34*

53.049.347.4*

96"468

1.241.561.76

51.347.444.8

1.301.641.84

51.547.645.1

1.361.721.94

51.747.845.3

1.411.801.93*

51.948.046.5*

1.461.872.03*

52.148.246.6*

1.531.942.11*

52.348.446.8*

1.562.012.20*

52.548.646.9*

1.612.082.28*

52.748.847.1*

1.662.01*2.37*

52.850.1*47.2*

108"468

1.261.581.76

51.147.244.8

1.311.661.78*

51.447.445.9*

1.361.761.87*

51.647.646.1*

1.421.821.95*

51.847.846.3*

1.481.892.05*

52.048.046.4

1.541.952.13*

52.248.246.6*

1.582.032.21*

52.448.446.8*

1.621.96*2.29*

52.649.8*47.0*

1.682.03*2.38*

52.749.9*47.1*

120"468

1.271.591.71*

51.047.145.4*

1.321.661.79*

51.247.445.7*

1.381.64*1.89*

51.448.7*45.9*

1.441.71*1.97*

51.648.9*46.1*

1.491.79*2.07*

51.849.0*46.2*

1.551.86*2.15*

52.049.2*46.4*

1.46*1.92*2.23*

53.3*49.4*46.6*

1.50*1.99*2.31*

53.5*49.6*46.8*

1.56*2.06*2.40*

53.6*49.7*46.9*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 17 -

70°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 50°F, LEAVING WATER

67°F, ENTERING AIR WET BULB, 40°F, ENTERING WATER, 50°F, LEAVING WATER

TABLE 4 - cont.

Face VelocityFPM 400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

24"468

1.411.902.22

57.351.948.1

1.461.992.33

57.752.348.4

1.512.072.44

58.052.648.7

1.572.162.55

58.252.949.0

1.632.252.66

58.453.149.2

1.692.332.77

58.653.449.5

1.742.412.87

58.853.649.8

1.792.502.97

59.053.850.0

1.852.593.08

59.153.950.2

36"468

1.552.022.31

55.950.647.0

1.612.112.43

56.250.947.3

1.672.212.55

56.551.247.5

1.742.302.66

56.751.547.8

1.822.422.80

56.951.748.0

1.882.492.90

57.152.048.3

1.942.593.01

57.352.248.5

2.002.663.11

57.552.548.8

2.062.763.24

57.752.749.0

48"468

1.612.092.37

55.149.946.4

1.692.182.48

55.450.246.7

1.762.282.60

55.750.547.0

1.832.372.72

55.950.847.2

1.912.482.85

56.151.047.4

1.982.572.96

56.351.347.7

2.052.673.08

56.551.547.9

2.112.763.20

56.751.748.1

2.182.863.31

56.951.948.3

60"468

1.672.122.38

54.649.446.1

1.742.212.51

54.949.846.4

1.812.322.62

55.250.146.7

1.892.412.75

55.450.446.9

1.972.522.88

55.650.647.1

2.042.613.00

55.850.947.3

2.112.713.13

56.051.147.5

2.182.813.09*

56.251.349.0*

2.242.913.20*

56.451.549.2*

72"468

1.712.132.40

54.249.045.9

1.782.252.52

54.549.446.2

1.852.352.64

54.849.746.5

1.932.452.66*

55.050.047.8*

2.022.562.79*

55.250.348.0*

2.082.652.90*

55.550.648.3*

2.152.743.01*

55.750.948.5*

2.222.68*3.13*

55.952.4*48.7*

2.302.77*3.23*

56.152.6*48.9*

84"468

1.732.172.41

53.948.845.8

1.812.272.53

54.249.146.1

1.892.372.58*

54.449.547.3*

1.962.472.69*

54.749.847.5*

2.052.582.82*

54.950.147.7*

2.132.672.93*

55.150.448.0*

2.192.763.04*

55.450.748.2*

2.07*2.73*3.15*

57.0*52.0*48.5*

2.12*2.82*3.26*

57.3*52.2*48.7*

96"468

1.752.08*2.35*

53.649.8*46.5*

1.842.18*2.47*

53.950.2*46.8*

1.912.28*2.59*

54.250.5*47.1*

1.982.37*2.71*

54.550.8*47.3*

2.072.48*2.84*

54.751.0*47.5*

2.142.57*2.95*

55.051.3*47.8*

2.04*2.67*3.07*

56.5*51.5*48.0*

2.11*2.77*3.18*

56.7*51.7*48.2*

2.17*2.86*3.30*

56.9*51.9*48.4*

108"468

1.782.09*2.36*

53.449.7*46.4*

1.70*2.19*2.48*

55.3*50.0*46.7*

1.78*2.30*2.61*

55.5*50.3*46.9*

1.86*2.39*2.73*

55.7*50.6*47.1*

1.93*2.50*2.86*

55.9*50.8*47.3*

2.00*2.61*2.97*

56.1*51.0*47.6*

2.07*2.69*3.09*

56.3*51.3*47.8*

2.14*2.79*3.21*

56.5*51.5*48.0*

2.20*2.89*3.32*

56.7*51.7*48.2*

120"468

1.68*2.11*2.37*

54.4*49.5*46.2*

1.75*2.21*2.50*

54.8*49.8*46.4*

1.82*2.32*2.64*

55.1*50.1*46.6*

1.89*2.42*2.76*

55.4*50.3*46.8*

1.97*2.53*2.89*

55.6*50.5*47.0*

2.03*2.63*3.00*

55.9*50.8*47.3*

2.10*2.73*3.12*

56.1*51.0*47.5*

2.17*2.81*3.24*

56.3*51.3*47.7*

2.24*2.91*3.36*

56.4*51.5*47.9*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

24"468

1.161.601.88

56.051.147.7

1.211.681.98

56.351.448.0

1.261.752.07

56.551.748.3

1.301.812.16

56.752.048.5

1.361.882.26

56.852.248.7

1.401.952.34

57.052.548.9

1.452.022.44

57.252.749.1

1.502.082.52

57.352.949.3

1.552.152.60

57.453.149.5

36"468

1.291.711.96

54.649.846.7

1.351.792.06

54.950.147.0

1.401.872.16

55.250.447.2

1.451.952.27

55.450.747.4

1.502.022.38

55.650.947.6

1.552.092.47

55.851.247.8

1.602.172.56

56.051.448.0

1.662.252.66

56.151.648.2

1.722.322.74

56.251.848.4

48"468

1.371.762.01

53.849.246.1

1.421.842.11

54.149.546.4

1.481.932.22

54.449.846.6

1.542.022.32

54.650.046.8

1.602.102.44

54.850.247.0

1.642.182.53

55.050.447.2

1.712.262.63

55.250.647.4

1.772.342.72

55.350.847.6

1.822.422.81

55.451.047.8

60"468

1.411.802.03

53.348.745.8

1.471.892.14

53.649.046.0

1.541.972.25

53.849.346.2

1.602.062.36

54.049.646.4

1.662.142.46

54.249.846.6

1.722.232.56

54.450.046.8

1.782.312.66

54.650.247.1

1.842.392.76

54.850.447.3

1.902.472.85

54.950.647.5

72"468

1.441.832.06

53.048.445.5

1.501.922.17

53.348.745.7

1.572.002.28

53.549.045.9

1.632.082.39

53.749.346.1

1.702.172.49

53.949.546.3

1.762.252.60

54.149.846.5

1.822.332.70

54.350.046.7

1.872.422.64*

54.550.248.3*

1.942.512.74*

54.650.348.4*

84"468

1.471.842.07

52.748.245.3

1.531.932.18

53.048.645.5

1.602.012.30

53.248.945.7

1.672.092.26*

53.449.247.4*

1.732.182.37*

53.649.447.5*

1.792.262.47*

53.849.747.7*

1.862.342.58*

54.049.947.8*

1.912.432.68*

54.250.147.9*

1.972.522.79*

54.450.248.0*

96"468

1.481.852.08

52.548.145.2

1.551.942.08*

52.848.446.7*

1.611.93*2.19*

53.149.8*46.9*

1.682.01*2.30*

53.350.0*47.0*

1.752.10*2.41*

53.450.2*47.1*

1.802.17*2.51*

53.750.5*47.1*

1.872.24*2.61*

53.950.7*47.5*

1.932.33*2.72*

54.150.9*47.6*

2.002.40*2.82*

54.251.1*47.7*

108"468

1.501.862.01*

52.348.046.0*

1.561.85*2.12*

52.649.4*46.2*

1.631.95*2.23*

52.949.6*46.4*

1.702.03*2.34*

53.149.8*46.6*

1.752.12*2.44*

53.450.0*46.8*

1.822.19*2.55*

53.650.3*47.0*

1.75*2.27*2.65*

54.8*50.5*47.2*

1.81*2.36*2.74*

55.0*50.7*47.4*

1.86*2.43*2.84*

55.2*50.9*47.6*

120"468

1.511.79*2.04*

52.248.8*45.6*

1.47*1.88*2.15*

53.6*49.1*45.9*

1.53*1.97*2.26*

53.8*49.3*46.1*

1.60*2.05*2.36*

54.0*49.6*46.3*

1.66*2.14*2.47*

54.2*49.8*46.5*

1.72*2.23*2.57*

54.4*50.0*46.8*

1.78*2.30*2.67*

54.6*50.3*47.0*

1.83*2.38*2.77*

54.8*50.5*47.2*

1.89*2.46*2.86*

55.0*50.7*47.4*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 18 -

64°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 55°F, LEAVING WATER

TABLE 4 - cont.

67°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 55°F, LEAVING WATER

Face VelocityFPM 400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

.81†.93

1.15

56.1†54.852.3

.84†.97

1.20

56.3†55.052.6

.87†1.021.25

56.5†55.152.8

.90†1.051.30

56.6†55.353.0

.94†1.091.34

56.7†55.453.2

.98†1.141.40

56.8†55.553.3

1.01†1.161.45

56.9†55.753.4

1.04†1.201.50

57.0†55.853.5

1.07†1.241.57

57.1†55.953.5

36"468

.741.041.24

56.853.651.3

.771.081.30

57.053.851.5

.801.131.37

57.154.051.6

.831.171.42

57.354.251.8

.851.221.48

57.454.351.9

.871.271.54

57.654.452.1

.901.311.60

57.754.552.2

.931.361.66

57.854.652.3

.951.411.71

57.954.752.4

48"468

.811.091.29

56.153.050.7

.841.141.35

56.353.250.9

.881.201.42

56.453.351.0

.901.241.48

56.653.551.2

.941.301.55

56.753.651.3

.961.351.61

56.953.751.5

.991.401.67

57.053.851.6

1.021.451.73

57.153.951.7

1.031.501.78

57.254.051.9

60"468

.861.131.32

55.652.550.3

.891.191.40

55.852.750.4

.921.241.46

56.052.950.6

.961.291.52

56.153.150.8

1.001.341.59

56.253.250.9

1.021.401.65

56.453.351.1

1.061.441.70

56.553.551.3

1.091.491.77

56.653.651.4

1.131.541.82

56.753.751.6

72"468

.901.161.34

55.252.250.1

.931.221.41

55.452.450.3

.961.271.48

55.652.650.4

.991.321.54

55.852.850.6

1.031.361.61

55.953.050.7

1.071.421.67

56.053.150.9

1.111.471.74

56.153.251.0

1.151.531.79

56.253.351.2

1.181.581.86

56.353.451.3

84"468

.911.181.36

55.052.049.9

.951.241.42

55.252.250.1

.991.291.50

55.452.450.2

1.021.341.56

55.652.650.4

1.061.401.63

55.752.750.5

1.101.441.70

55.852.950.7

1.141.501.76

55.953.050.8

1.171.551.82

56.053.151.0

1.211.611.88

56.153.251.1

96"468

.931.191.37

54.851.949.8

.971.251.43

55.052.150.0

1.021.301.51

55.152.350.1

1.051.361.57

55.352.450.3

1.091.421.64

55.452.550.4

1.121.471.70

55.652.750.6

1.161.521.77

55.752.850.7

1.191.581.84

55.952.950.8

1.231.631.91

56.053.050.9

108"468

.941.201.38

54.751.749.6

.981.261.45

54.951.949.8

1.031.321.52

55.052.150.0

1.061.371.58

55.252.350.2

1.101.431.65

55.352.450.3

1.151.491.73

55.452.550.4

1.181.541.78

55.652.750.6

1.211.591.85

55.752.850.7

1.251.651.92

55.852.950.8

120"468

.961.211.39

54.551.649.5

.991.271.46

54.851.849.7

1.031.331.53

55.052.049.9

1.071.381.58

55.152.250.1

1.111.441.66

55.252.350.2

1.161.501.73

55.352.450.4

1.201.551.80

55.452.650.5

1.241.611.77*

55.552.751.4*

1.281.661.83*

55.652.851.5*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft.2

Lvg.W.B.

°F.

Tonsperft.2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsper ft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.04†1.211.47

57.3†55.552.7

1.09†1.261.54

57.5†55.852.9

1.13†1.311.61

57.7†56.053.1

1.17†1.361.68

57.9†56.253.3

1.22†1.411.74

58.0†56.453.5

1.26†1.461.81

58.2†56.653.7

1.29†1.511.88

58.4†56.753.8

1.33†1.561.94

58.5†56.854.0

1.37†1.622.01

58.6†56.954.1

36"468

.971.321.56

58.054.351.6

1.001.381.63

58.354.651.9

1.041.441.71

58.554.852.1

1.071.491.78

58.755.052.3

1.121.551.84

58.855.252.4

1.151.601.93

59.055.452.6

1.191.652.00

59.155.652.8

1.231.722.08

59.255.752.9

1.281.782.16

59.255.853.0

48"468

1.041.381.61

57.353.651.0

1.081.441.69

57.653.951.3

1.121.511.76

57.854.151.5

1.171.571.84

57.954.351.7

1.181.611.90

58.154.551.8

1.241.692.00

58.354.752.0

1.291.742.09

58.454.952.1

1.331.802.17

58.555.152.2

1.371.862.25

58.655.252.3

60"468

1.091.421.64

56.853.250.6

1.131.481.72

57.153.550.9

1.171.551.79

57.353.751.2

1.211.611.87

57.553.951.4

1.241.661.94

57.654.051.5

1.301.752.04

57.854.251.7

1.351.802.12

57.954.451.8

1.401.862.21

58.054.651.9

1.451.932.30

58.154.751.9

72"468

1.121.451.66

56.552.950.4

1.171.511.74

56.753.250.7

1.211.581.82

56.953.450.9

1.261.641.90

57.153.651.1

1.291.701.97

57.253.751.2

1.351.782.07

57.453.951.4

1.401.842.16

57.554.151.5

1.461.902.24

57.654.351.6

1.511.972.34

57.754.451.6

84"468

1.141.461.68

56.352.750.2

1.191.541.77

56.552.950.4

1.241.611.85

56.753.150.6

1.281.671.93

56.953.350.8

1.311.722.00

57.053.550.9

1.381.812.10

57.253.751.1

1.431.872.19

57.353.951.2

1.481.932.27

57.454.151.4

1.542.002.35

57.554.251.5

96"468

1.161.481.69

56.152.550.1

1.211.551.78

56.352.850.3

1.261.621.86

56.553.050.5

1.301.691.95

56.753.250.6

1.341.732.02

56.853.450.7

1.401.822.13

57.053.650.9

1.461.882.21

57.153.851.0

1.511.952.29

57.253.951.2

1.562.032.24*

57.354.052.4*

108"468

1.171.501.69

55.952.350.0

1.221.561.79

56.252.650.2

1.271.631.87

56.452.950.4

1.321.701.96

56.653.150.5

1.351.742.05

56.753.350.6

1.421.832.15

56.953.550.7

1.471.892.24

57.053.750.8

1.531.962.17*

57.153.852.2*

1.592.042.25*

57.153.952.3*

120"468

1.181.521.64*

55.852.150.6*

1.231.48*1.72*

56.153.5*50.9*

1.281.55*1.80*

56.353.7*51.1*

1.331.61*1.88*

56.553.9*51.3*

1.361.66*1.95*

56.654.0*51.4*

1.431.75*2.05*

56.854.2*51.6*

1.481.80*2.10*

56.954.4*51.8*

1.541.86*2.19*

57.054.6*52.0*

1.601.93*2.28*

57.054.7*52.1*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 19 -

70°F, ENTERING AIR WET BULB, 45°F, ENTERING WATER, 55°F, LEAVING WATER

TABLE 4 - cont.

64°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 60°F, LEAVING WATER

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

1.081.511.80

60.656.353.1

1.121.571.89

60.956.653.3

1.161.641.98

61.156.853.5

1.201.712.07

61.357.053.7

1.251.772.16

61.457.153.9

1.281.852.23

61.657.354.2

1.331.912.31

61.757.554.4

1.371.972.40

61.857.754.6

1.412.042.47

61.957.854.8

36"468

1.221.621.89

59.355.152.0

1.261.692.00

59.655.452.2

1.311.772.09

59.855.652.4

1.361.842.18

60.055.852.7

1.401.912.27

60.256.052.9

1.451.992.36

60.456.253.1

1.492.062.45

60.656.453.3

1.542.132.53

60.756.653.5

1.592.192.62

60.856.853.7

48"468

1.291.681.95

58.654.451.4

1.331.762.04

58.954.751.7

1.391.842.14

59.154.951.9

1.441.922.24

59.355.152.1

1.502.002.35

56.555.352.3

1.542.082.43

59.755.552.5

1.602.152.52

59.855.752.7

1.662.222.62

59.955.952.9

1.712.292.71

60.056.153.1

60"468

1.341.731.98

58.053.951.0

1.401.812.09

58.354.251.2

1.441.882.18

58.654.551.5

1.501.972.28

58.854.751.7

1.562.052.38

59.054.951.9

1.612.132.47

59.255.152.2

1.672.202.56

59.355.352.4

1.732.302.64

59.455.352.7

1.792.352.73

59.555.752.9

72"468

1.381.752.00

57.753.750.8

1.431.832.10

58.054.051.1

1.491.912.20

58.254.251.3

1.552.002.30

58.454.451.5

1.612.082.41

58.654.651.7

1.662.162.50

58.854.851.9

1.712.242.60

59.055.052.1

1.782.322.53*

59.155.253.5*

1.832.402.62*

59.255.453.7*

84"468

1.401.762.01

57.453.550.6

1.461.842.11

57.753.850.9

1.511.922.21

58.054.151.2

1.572.012.31

58.254.351.4

1.632.092.42

58.454.551.6

1.692.172.51

58.654.751.8

1.742.262.61

58.854.952.0

1.802.332.58*

58.955.153.2*

1.872.412.66*

59.055.253.4*

96"468

1.421.782.02

57.253.350.5

1.481.74*2.04*

57.554.9*51.7*

1.531.83*2.14*

57.855.0*51.9*

1.601.91*2.24*

58.055.2*52.1*

1.662.00*2.34*

58.255.3*52.3*

1.722.08*2.43*

58.455.5*52.5*

1.772.15*2.52*

58.655.7*52.7*

1.822.22*2.62*

58.855.9*52.9*

1.892.30*2.70*

58.956.0*53.1*

108"468

1.441.792.03

57.053.250.4

1.501.75*2.06*

57.354.7*51.5*

1.561.84*2.16*

57.654.9*51.7*

1.621.93*2.26*

57.855.0*51.9*

1.682.02*2.36*

58.055.1*52.1*

1.742.10*2.45*

58.255.3*52.3*

1.792.17*2.54*

58.455.5*52.5*

1.852.25*2.64*

58.655.7*52.7*

1.902.33*2.73*

58.855.8*52.9*

120"468

1.451.72*1.97*

56.954.0*51.1*

1.511.79*2.07*

57.254.3*51.4*

1.571.88*2.17*

57.554.5*51.6*

1.631.96*2.27*

57.754.7*51.8*

1.692.05*2.38*

57.954.9*51.9*

1.62*2.13*2.48*

59.1*55.1*52.1*

1.67*2.20*2.57*

59.3*55.3*52.3*

1.71*2.27*2.66*

59.5*55.5*52.5*

1.77*2.36*2.75*

59.6*55.6*52.7*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

.56†

.75†

.91†

58.7†56.7†55.0†

.57†

.78†

.96†

58.9†56.9†55.1†

.59†

.81†1.00†

59.0†57.0†55.2†

.61†

.85†1.05†

59.1†57.1†55.3†

.63†

.88†1.09†

59.2†57.2†55.4†

.65†

.91†1.13†

59.3†57.3†55.5†

.67†

.94†1.17†

59.4†57.4†55.6†

.68†

.97†1.22†

59.5†57.5†55.7†

.71†1.04†1.25†

59.5†57.5†55.8†

36"468

.61†

.82†.86

58.1†56.0†55.5

.63†

.86†.90

58.3†56.1†55.7

.65†

.89†.94

58.5†56.3†55.8

.67†.79.98

58.6†57.655.9

.70†.82

1.02

58.7†57.756.0

.72†.85

1.06

58.8†57.856.1

.74†.87

1.10

58.9†57.956.2

.77†.90

1.14

58.9†58.056.3

.80†.94

1.17

58.9†58.056.4

48"468

.65†.75.91

57.7†56.755.0

.68†.77.96

57.8†56.955.1

.70†.81

1.00

58.0†57.055.2

.61

.851.05

59.157.155.3

.63

.881.09

59.257.255.4

.65

.911.13

59.357.355.5

.67

.941.17

59.457.455.6

.70

.971.22

59.457.555.7

.711.011.25

59.557.555.8

60"468

.57

.80

.95

58.556.254.6

.59

.83

.99

58.756.454.8

.61

.871.03

58.856.554.9

.64

.901.08

58.956.655.0

.67

.941.13

58.956.755.1

.69

.981.17

59.056.955.2

.71

.991.21

59.157.055.3

.731.031.26

59.257.155.4

.761.051.30

59.257.255.5

72"468

.61

.83

.97

58.155.954.3

.63

.861.02

58.356.154.4

.65

.901.06

58.456.254.6

.68

.941.11

58.556.354.7

.71

.971.16

58.656.454.8

.731.001.21

58.756.654.9

.751.031.24

58.856.755.1

.771.071.28

58.956.855.2

.801.101.32

58.956.955.3

84"468

.63

.85

.98

57.955.754.2

.65

.881.03

58.155.954.3

.67

.911.08

58.356.154.4

.70

.951.13

58.456.254.5

.72

.991.18

58.556.354.6

.741.021.23

58.656.454.7

.761.061.26

58.756.554.9

.791.091.31

58.856.655.0

.821.121.35

58.856.755.1

96"468

.65

.86

.99

57.755.654.1

.67

.891.04

57.955.854.2

.69

.931.10

58.155.954.3

.72

.971.14

58.256.054.4

.741.011.19

58.356.154.5

.771.051.24

58.456.254.6

.791.081.28

58.556.354.8

.811.121.32

58.656.454.9

.851.141.36

58.656.555.0

108"468

.66

.861.00

57.655.554.0

.68

.901.05

57.855.754.1

.71

.941.11

57.955.854.2

.74

.981.16

58.055.954.3

.771.021.21

58.156.054.4

.801.061.25

58.256.154.5

.821.101.30

58.356.254.6

.841.141.34

58.456.354.8

.861.171.38

58.656.555.0

120"468

.67

.871.01

57.555.453.9

.70

.911.06

57.655.654.0

.73

.951.12

57.755.754.1

.76

.991.17

57.855.854.2

.791.031.22

57.955.954.3

.821.071.27

58.056.054.4

.841.111.31

58.156.154.5

.871.151.35

58.256.254.7

.891.181.39

58.356.354.8

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

- 20 -

67°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 60°F, LEAVING WATER

TABLE 4 - cont

70°F, ENTERING AIR WET BULB, 50°F, ENTERING WATER, 60°F, LEAVING WATER

Face VelocityFPM 400 425 450 475 500 525 550 575 600

NTLRowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

.73†1.00†1.21†

60.4†57.7†55.5†

.76†1.05†1.27†

60.5†57.8†55.7†

.80†1.09†1.33†

60.6†58.0†55.8†

.83†1.14†1.38†

60.7†58.1†56.0†

.86†1.19†1.25

60.8†58.2†57.7

.89†1.24†1.30

60.9†58.3†57.8

.92†1.27†1.35

61.0†58.5†57.9

.96†1.31†1.40

61.0†58.6†58.0

.97†1.36†1.44

61.2†58.7†58.1

36"468

.81†.95

1.15

59.6†58.256.1

.85†.991.21

59.7†58.456.3

.89†1.031.27

59.8†58.656.4

.741.071.31

61.458.756.6

.771.121.37

61.558.856.7

.791.161.41

61.658.956.9

.811.201.47

61.759.057.0

.841.241.52

61.859.157.1

.881.281.57

61.859.257.2

48"468

.731.011.21

60.457.655.5

.761.051.27

60.557.855.7

.801.101.33

60.657.955.8

.831.141.38

60.758.156.0

.861.191.45

60.858.256.1

.891.231.49

60.958.456.3

.921.271.55

61.058.556.4

.951.311.61

61.158.656.5

.971.361.65

61.258.756.7

60"468

.771.051.24

60.057.255.2

.801.091.30

60.257.455.4

.831.141.35

60.357.655.6

.871.191.42

60.457.755.7

.901.261.48

60.557.855.8

.931.281.53

60.658.056.0

.961.321.59

60.758.156.1

.991.371.65

60.858.256.2

1.031.411.70

60.858.356.3

72"468

.811.081.26

59.656.955.0

.841.121.32

59.857.155.2

.871.171.37

60.057.355.4

.901.221.44

60.157.455.5

.941.281.50

60.257.555.6

.971.331.57

60.357.655.7

1.001.361.63

60.457.855.8

1.041.411.69

60.557.955.9

1.081.461.75

60.558.056.0

84"468

.831.101.28

59.456.754.8

.861.141.34

59.656.955.0

.891.191.39

59.857.155.2

.931.241.46

59.957.255.3

.961.301.53

60.057.355.4

1.001.341.58

60.157.555.6

1.031.391.64

60.257.655.7

1.071.441.70

60.357.755.8

1.111.491.76

60.357.855.9

96"468

.851.111.29

59.256.654.6

.881.151.35

59.456.854.8

.911.201.41

59.657.055.0

.951.261.48

59.757.155.1

.991.311.55

59.857.255.2

1.031.371.61

59.957.355.3

1.061.421.67

60.057.455.5

1.091.471.73

60.157.555.6

1.131.521.79

60.257.655.7

108"468

.861.131.30

59.156.454.5

.891.181.36

59.356.654.7

.921.221.43

59.556.854.9

.961.281.49

59.656.955.0

1.001.341.56

59.757.055.1

1.041.381.62

59.857.255.3

1.081.431.68

59.957.355.4

1.111.481.74

60.057.455.5

1.161.531.80

60.057.555.6

120"468

.881.141.31

58.956.354.4

.911.191.37

59.156.554.6

.951.231.44

59.356.754.7

.991.291.50

59.456.854.9

1.031.351.57

59.556.955.0

1.071.401.64

59.657.055.1

1.101.441.69

59.757.255.3

1.141.501.65*

59.857.356.2*

1.171.541.70*

59.957.456.3*

Face VelocityFPM

400 425 450 475 500 525 550 575 600

NTL RowsDeep

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.

°F.

Tonsperft. 2

Lvg.W.B.°F.

Tonsperft. 2

Lvg.W.B.°F.

24"468

.95†1.30†1.37

61.8†58.4†57.7

.99†1.35†1.43

62.0†58.7†57.9

1.03†1.191.50

62.2†60.858.1

1.07†1.251.56

62.3†60.958.3

1.11†1.301.63

62.4†61.058.4

1.14†1.351.69

62.6†61.158.6

1.18†1.401.75

62.7†61.258.7

1.22†1.451.81

62.8†61.358.9

1.27†1.501.87

62.8†61.459.0

36"468

.901.231.46

62.359.156.7

.921.281.54

62.659.456.9

.971.331.61

62.759.657.1

.991.381.69

62.959.857.2

1.031.441.77

63.059.957.3

1.061.491.83

63.260.157.5

1.091.541.90

63.360.157.6

1.121.601.97

63.460.357.7

1.171.672.05

63.460.357.8

48"468

.951.281.52

61.858.656.1

.991.341.60

62.058.856.3

1.041.411.67

62.158.956.5

1.081.461.74

62.259.156.7

1.131.531.83

62.359.256.8

1.161.581.89

62.559.457.0

1.201.641.97

62.659.557.1

1.241.692.03

62.759.757.3

1.271.752.10

62.859.857.4

60"468

1.001.321.55

61.358.255.8

1.051.381.63

61.558.456.0

1.091.441.71

61.758.656.2

1.121.501.77

61.958.856.4

1.171.571.86

62.058.956.5

1.201.621.93

62.259.156.7

1.241.682.01

62.359.256.8

1.281.752.08

62.459.356.9

1.321.812.16

62.559.457.0

72"468

1.041.351.57

61.057.955.6

1.081.411.65

61.258.155.8

1.121.481.74

61.458.355.9

1.161.531.81

61.658.556.1

1.211.611.90

61.758.656.2

1.241.661.96

61.958.856.4

1.281.732.05

62.058.956.5

1.331.792.11

62.159.056.7

1.371.852.19

62.259.156.8

84"468

1.071.371.59

60.757.755.4

1.111.431.67

60.957.955.6

1.161.501.76

61.158.155.7

1.201.561.83

61.358.355.9

1.251.631.92

61.458.456.0

1.281.691.99

61.658.656.2

1.311.742.07

61.758.856.3

1.361.812.14

61.958.956.5

1.401.872.22

62.059.059.6

96"468

1.091.391.61

60.557.555.2

1.131.451.69

60.757.755.4

1.181.521.78

60.957.955.5

1.221.581.86

61.158.155.7

1.271.661.94

61.258.255.8

1.311.712.02

61.458.456.0

1.361.772.10

61.558.556.1

1.401.832.18

61.658.756.2

1.451.902.10*

61.758.857.4*

108"468

1.101.401.62

60.457.455.1

1.151.471.70

60.657.655.3

1.191.531.79

60.857.855.4

1.231.591.87

61.058.055.6

1.291.671.96

61.158.155.7

1.321.731.95*

61.358.356.5*

1.371.802.02*

61.458.456.7*

1.421.73*2.07*

61.559.4*57.0*

1.471.77*2.13*

61.659.6*57.2*

120"468

1.121.411.62

60.257.355.0

1.171.481.71

60.457.555.2

1.211.551.80

60.657.655.3

1.261.621.87*

60.857.855.6*

1.311.691.93*

60.957.955.9*

1.361.67*1.98*

61.058.7*56.3*

1.401.73*2.05*

61.258.9*56.5*

1.451.76*2.10*

61.359.2*56.8*

1.501.81*2.16*

61.459.4*57.0*

( ) = KWS, (†) = KWH, (*) = KWDAbove capacities are based on Series 80 fin spacing. For other fin spacings see Capacity Correction Factors Table No. 2, page 7.Note: Table may NOT be used when S T ratio is 90 or greater.

EXAMPLE COIL SELECTION

- 21 -

6. TOTAL BTU/HR CAPACITY (KWH84-18x24) Total BTU/HR = Tons/Sq. Ft. X Sq. Ft. X 12,000

= 98 x 3.0 x 12,000 @ 35,300

(Formula 10)

7. LEAVING WET BULB TEMPERATURE (KWH84-18x24)

Total BTU/HR = 4.5 X CFM X (Total Heat Ent. Air -

Total Heat Lv. Air) (Formula 1)

Total Heat Difference =

Total BTU/HR =

35,300

4.5 x CFM 4.5 x 1500

= 5.23 BTU/LB

Total Heat @ 68.0°F. Ent. W.B. = 32.42 BTU/LB Table 3

Total Heat Difference = -5.23 Page 9

Total Heat @ Lv. W.B. Temp. = 27.19

Lv. W.B. Temperature = 61.1 °F. Table 3

Page 9

8. LEAVING DRY BULB TEMPERATURE

(KWH84-18x24) Lv. D.B. = Lv. W.B. + (Initial W.B. Depression X W.B.

Depression Factor) (Formula 4b)

= 61.1 + ([77 - 68] x .11) = 62.1°F.

W.B. Depression Factor from Fig. 5b, Page 28

9. SENSIBLE BTU/HR (KWH84-18x24) Sensible load BTU/HR = 1.09 CFM (Ent. D.B. -

Lv. D.B.) (Formula 3)

= 1.09 X 1500 (77-62.1)

= 24,360

10. FINAL SELECTION

Model KWH84-18 X 24. This Coil meets the specified

requirements without exceeding either the Sensible BTU/HR

or the Total BTU/HR by a wide margin.

GIVEN:Entering Dry Bulb......................................................................................................................77°F.Entering Wet Bulb.....................................................................................................................68°F.CFM (Std. Air) ........................................................................... ...........................................1500Maximum Face Velocity........................................................................ .....................500 FPMTotal Capacity Require..........................................................................................34,900 BTU/HR.Sensible Capacity Required. . .................................................................... 22,500 BTU/HREntering Water Temperature ........................................................................ ...................50°F.Desired Water Temperature Rise...........................................................................................9°F.

EXAMPLE PROBLEM NO. 1(Showing use of Direct Selection Table No.4)

SOLUTION

1. S/T RATIO REQUIRED

S/T = Sensible Load

= 22,500

= .645

(Formula 9) Total Load 34,900

This table can be used to select a coil.

2. FACE AREA REQUIRED

Minimum Face Area = 1500

= 3.0 Sq. Ft. (Formula 7) 500

3. TONS PER SQUARE FOOT REQUIRED

Tons/ Sq. Ft = 34,900

= .97 (Formula 10) 2,006 X 34. PRELIMINARY COIL SELECTION

(a) Table 1, Page 6 indicates that a 12” X 36” NTLwould have about the maximum desirable lengthfor a reasonable length-to height ratio, however an18” X 24” also meets the required face area of 3.0sq. ft. Before making the preliminary selectionreview direct selection tables to determine theapproximate NTL required.

(b) Since interpolation is required, it will be necessaryto review the 50°F ent. water for 8°F and 10°Fwater temperature rise at both 67°F and 70°F.Entering W.B. temperatures. Tables on Pages 15,16 and 20 apply. Note coil type changes from KWH(half serp.) to KWS (single serp.) for 4 Row Coils at36” NTL and interpolation between different coiltypes does not give correct values as explained onPage 11. Therefore, since the type KWH has highercapacity and the review of tables indicates that a 4row 24” NTL coil has sufficient tons per sq. ft., thepreliminary selection is a model

KWH84-18 X 24.

5. TONS PER SQUARE FOOT (KWH84-18x24) Interpolation for 68°F. Ent. W.B. at 500 FPM and 50°F. Ent. Water Temperature. Tons per Sq. Ft. for 8” Rise = 1.02 Tons per Sq. Ft. for 10” Rise = .94 Therefore, Tons per Sq. Ft. for 9” Rise = .98 which is satisfactory.

EXAMPLE COIL SELECTION

- 22 -

7. TEMPERATURE RISE OF WATER AND LEAVING WATER TEMPERATURE REQUIRED

Water Temperature Rise = 185.000

= 11.92°F. 500 X 31

(Formula 2) Leaving Water Temperature = Ent. Water °F + Rise °F = 47 + 11.9 = 58.9°F.

8. WETTED SURFACE FACTOR (WSF) Entering Air D.B. = 87°F. Entering Water Temp. = 47°F. 40°F Entering Air Dew Point* = 63.8°F. Entering Water Temp. = 47.0°F. 16.8°F. WSF - 1.22 from Figure 3, Page 26

9. MEAN EFFECTIVE TEMPERATURE DIFFERENCE (M.E.D.) Ent. Air D. B. = 87.0°F. Req. Lv. Air D.B. = 60.0°F. Lv. Water Temp. = 58.9°F. Ent. Water Temp. = 47.0°F. D, = 28.1°F D2 = 13.0°F. M. E. D. = 19.59 from Table 5, Page 24, 25 by interpolation.

10. WATER VELOCITY

Water Velocity = 1.144 x GPM

= 1.144 x 31

= 2.95 FPS Tubes Fed 12

(Formula 5)

*Use 1.326 for high pressure coils Use 1.35 for.049 tube wall (Number of Tubes Fed obtained from Table 6 Page 26 assume Type KWS Coil 18" X 36" from Step 3.)11. HEAT TRANSFER FACTOR “U” U = 165 from Figure 4 , Page 27, for 507 FPM Face Velocity and 3 FPS Water Velocity. *Ent. Air Dew Point from Psychrometric Chart Fig. 16, Page 35

If a coil cannot he selected from the direct selection tables because the conditions arenot covered in the tables or if more than 8 rows are required, use Tables 5, 6 and 7 andFigures 3, and 4, by following the procedures outlined below. If a number of coils aredesired and study of the Direct Selection Table 4 indicates an odd row coil may be thecorrect answer and connections on opposite ends are not objectionable, thepossibilities of the odd row coil meeting the requirement should be checked.

GIVEN:CFM (std. air) .................................................................................................................................4,000Desired Face Area. .....................................................................................................8 Sq. Ft.Entering Air.Dry Bulb........................................................................................................87°FEntering Air Wet Bulb. ....................................................................................................71 °FTotal load BTU/HR.......................................................................................................185,000Sensible Load BTU/HR............................................................................................................117,600Entering Water Temp....................................................................................................................47°FWater Circulated GPM.....................................................................................................................31

EXAMPLE PROBLEM NO. 2

SOLUTION

Direct Selection Tables are not applicable since the entering W.B. temperature falls outside the range covered.

1. STANDARD AIR Correct to standard air as outlined on Page 8 when required.2. FACE VELOCITY

Face Velocity = CFM

= 4,000

= 500 FPM Face Area 8 (Formula 8)

3. PHYSICAL SIZEFrom Table 1 on Page 6 select a coil size to fit availablespace and having the required face area. Try an18" KWS x 63" Finned Length coil with 7.9 Sq. Ft. offace area.

Actual Face Velocity =CFM

= 4,000

= 507 FPM

Face Area 7.9 (use 500) (Formula 8)4. SENSIBLE TOTAL RATIO REQUIRED

S/T = 117,600

= .63 185,000 (Formula 9)

5. LEAVING WET BULB TEMPERATURE REQUIRED

Total Heat Difference = TOTAL BTU/HR

= 185,000

CFM x 4.5 4,000 x 4.5

= 10.30 (Formula 1) Total Heat @ 71 °F. Entering Air Wet Bulb = 34.95 . (from Table 3)

Total Heat Difference = 10.30 Total Heat @ Leaving Air Wet Bulb = 24.65

Leaving Air Wet Bulb = 57.3°F.

6. LEAVING DRY BULB TEMPERATURE REQUIRED

Lv. Air D.B. = Ent. Air D.B. - Sensible BTU/HR

1.09 x CFM (Formula 3)

Lv. Air D.B. = 87.0 = 117,600

1.09 x 4,000

= 87 - 27.0 = 60.0°F.

EXAMPLE COIL SELECTION

- 23 -

Air Dry Bulb and Sensible BTU/HR Capacity,

providing the coil has the ability to do the Total

BTU/HR Capacity specified at the given conditions.

The results obtained in Step 12 should be an

excellent guide to making a selection in Figure 5

between several coils that have satisfactory Wet

Bulb Depression Factors.

(c) To check assumptions made in 15(b) below, in re-

selecting a coil, Steps 2, 10, 11, 12 and 13 must be

recalculated to determine if the new selection will

l meet the Total and Sensible BTU/HR Capacity

required. This procedure must be repeated until a

selection is obtained that will satisfy the specified

conditions. In some cases the entering water

tem perature and/or water quantity (GPM) may have

to be changed to meet the required capacities.

EXAMPLE PROBLEM NO. 2 (Cont.)

SOLUTION (cont.)

12. ROWS DEEP REQUIRED FOR TOTAL LOAD

(80 FIN SERIES)

Rows =

Total BTU/HR

Face Area X WSF X MED X U X FFR

(Formula 6)

=

185,000 = 5.94

7.9 X 1.22 X 19.59 X 165 X 1

Therefore, a six-row W86-18 X 63 coil will meet the

required Total Load.

13. LEAVING AIR DRY BULB (80 FIN SERIES)

Lv. Air D.B. = Lv. Air W.B. + Final W.B. Depression

= 57.3 + .04 = 57.34°F.

(Formula 4c)

Where: Final W.B. Depression = Initial W.B. Depression

X W.B. Depression Factor

Initial W.B. Depression = 87 - 71 = 16°F.

W.B. Depression Factor = .04 (from Fig. 5 b

Page 28

14. The KWS86-18x63 coil, will therefore, meet both the

Sensible and Total Load and would be an excellent

selection.

15. SUGGESTED METHOD OF RE-SELECTION (WHEN

NECESSARY)

(a) Determine the Required Wet Bulb Depression Factor

Required W.B. Depression Factor =

Lv. D.B. - Lv. W.B.

Ent D.B. - Ent W.B.

(b) For a required Wet Bulb Depression Factor, several

surfaces can usually be selected from Figure 10

which have a Wet Bulb Depression Factor equal to or

less than the required Wet Bulb Depression Factor.

Any coil having the required Wet Bulb Depression

Factor in Figure 5 can achieve the specified Leaving

AIR CONDITION

ENTERING COIL

DRY - BULB TEMP °F50 60 70 80 87 90

60%

40%

71

70

65

60 57.3 55

50

80%

REL

ATI

VE H

UM

IDIT

Y

AIR CONDITION

LEAVING COIL

M. E. D. Logarithmic Mean Effective Temperature Difference (between the air and heat transfer fluid)

Table 5

- 24 -

D1

orD

1 or D

2

D2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

1

2

3

4

5

1.00

1.44

1.82

2.16

2.48

2.00

2.47

2.89

3.28

3.00

3.51

3.95

4.00

4.48 5.00

6

7

8

9

10

2.79

3.08

3.37

3.64

3.91

3.64

3.99

4.33

4.65

4.97

4.33

4.73

5.10

5.40

5.82

4.93

5.36

5.77

6.17

6.55

5.49

5.94

6.38

6.81

7.21

6.00

6.37

7.01

7.40

7.85

7.00

7.63

7.86

8.39

8.00

8.49

8.96

9.00

9.58 10.00

11

12

13

14

15

4.17

4.43

4.68

4.93

5.17

5.28

5.58

5.88

6.17

6.45

6.17

6.49

6.82

7.15

7.46

6.92

7.28

7.64

8.00

8.32

7.61

8.00

8.37

8.74

9.10

8.27

8.70

9.08

9.47

9.98

8.87

9.32

9.67

10.10

10.52

9.42

9.86

10.30

10.72

11.13

10.06

10.52

10.97

11.24

11.70

10.49

10.97

11.43

11.89

12.33

11.00

11.49

11.96

12.42

12.94

12.00

12.50

12.99

13.45

13.00

13.48

13.91

14.00

14.58 15.00

16

17

18

19

20

5.41

5.65

5.88

6.11

6.34

6.73

7.01

7.28

7.55

7.82

7.77

8.08

8.37

8.67

8.96

8.66

8.98

9.31

9.63

9.94

9.46

9.81

10.15

10.49

10.82

10.22

10.61

10.96

11.30

11.67

10.86

11.26

11.65

12.04

12.37

11.54

11.94

12.33

12.72

13.10

12.14

12.57

12.99

13.39

13.92

12.77

13.19

13.61

14.02

14.43

13.33

13.79

14.22

14.65

15.06

13.90

14.45

14.80

15.23

15.66

14.44

14.90

15.35

15.80

16.26

14.93

15.46

15.90

16.38

16.81

15.87

16.00

16.46

16.90

17.39

16.00

16.29

16.98

17.31

17.93

17.00

17.51

18.07

18.51

18.00

18.35

18.99

19.00

19.23 20.00

21

22

23

24

25

6.57

6.79

7.02

7.24

7.46

8.08

8.34

8.60

8.85

9.11

9.25

9.54

9.82

10.01

10.38

10.25

10.56

10.86

11.16

11.46

11.15

11.47

11.79

12.11

12.43

12.00

12.35

12.68

13.02

13.34

12.74

13.11

13.44

13.79

14.14

13.47

13.84

14.20

14.56

14.92

14.19

14.57

14.89

15.27

15.65

14.83

15.22

15.61

15.99

16.37

15.47

15.87

16.27

16.64

17.05

16.08

16.50

16.92

17.31

17.74

16.69

17.11

17.53

17.95

18.35

17.26

17.71

18.12

18.55

18.95

17.83

18.28

18.72

19.15

19.58

18.35

18.84

19.27

19.73

20.14

18.96

19.40

19.90

20.33

20.76

19.43

19.96

20.38

20.86

21.30

20.24

20.45

20.90

21.48

21.86

20.49

20.99

21.46

21.94

22.41

21.00

21.32

22.05

22.40

22.99

22.00

22.73

22.96

23.53

23.00

22.53

23.98

24.00

24.63 25.00

26

27

28

29

30

7.67

7.89

8.10

8.32

8.53

9.36

9.61

9.85

10.01

10.34

10.65

10.92

11.19

11.46

11.73

11.75

12.05

12.33

12.62

12.90

12.74

13.05

13.35

13.65

13.95

13.67

13.99

14.31

14.63

14.94

14.46

14.81

15.15

15.49

15.79

15.26

15.62

15.96

16.31

16.64

16.02

16.38

16.75

17.10

17.46

16.75

17.11

17.48

17.85

18.20

17.43

17.82

18.20

18.57

18.94

18.11

18.50

18.89

19.27

19.64

18.76

19.20

19.55

19.94

20.33

19.38

19.79

20.20

20.60

20.99

20.01

20.42

20.83

21.24

21.64

20.60

21.01

21.44

21.85

22.27

21.20

21.63

22.04

22.49

22.90

21.77

22.19

22.62

23.07

23.48

22.34

22.76

23.20

23.66

24.08

22.87

23.33

23.77

24.22

24.66

23.42

23.86

24.33

24.78

25.21

23.92

24.45

24.86

23.35

25.77

24.55

24.94

25.47

25.87

26.38

25.06

25.47

25.91

26.47

26.89

25.51

25.97

26.48

26.95

27.43

31

32

33

34

35

8.74

8.94

9.15

9.36

9.56

10.58

10.82

11.06

11.29

11.53

11.98

12.26

12.51

12.76

13.03

13.19

13.47

13.74

14.02

14.29

14.25

14.55

14.84

15.13

15.47

15.25

15.57

15.87

16.17

16.48

16.12

16.45

16.75

17.08

17.40

16.98

17.31

17.64

17.97

18.29

17.81

18.11

18.46

18.80

19.14

18.56

18.91

19.26

19.61

19.96

19.31

19.66

20.03

20.37

20.72

20.02

20.39

20.76

21.12

21.48

20.71

21.09

21.47

21.85

22.22

21.27

21.77

22.18

22.53

22.92

22.09

22.45

22.83

23.22

23.60

22.67

23.08

23.47

23.88

24.27

23.31

23.72

24.13

24.53

24.94

23.92

24.33

24.75

25.15

25.58

24.50

24.94

25.35

25.79

26.19

25.10

25.53

25.96

26.30

26.95

25.69

26.11

26.57

26.98

27.40

26.55

26.67

27.13

27.58

28.00

26.89

27.27

27.69

28.15

28.57

27.32

27.83

28.27

28.69

29.18

27.89

28.35

28.82

29.27

29.72

36

37

38

39

40

9.77

9.97

10.17

10.37

10.57

11.76

12.00

12.23

12.45

12.68

13.28

13.53

13.78

14.04

14.29

14.56

14.83

15.10

15.37

15.63

15.70

15.99

16.27

16.55

16.83

16.77

17.07

17.36

17.67

17.95

17.71

18.01

18.32

18.63

18.92

18.62

18.94

19.25

19.57

19.88

19.48

19.81

20.14

20.47

20.80

20.30

20.64

20.97

21.31

21.64

21.08

21.43

21.78

22.13

22.46

21.85

22.20

22.55

22.91

23.26

22.58

22.95

23.30

23.67

24.02

23.30

23.66

24.05

24.41

24.77

23.99

24.37

24.73

25.12

25.49

24.66

25.04

25.43

25.81

26.19

25.33

25.72

26.11

26.50

26.89

25.97

26.36

26.77

27.16

27.56

26.62

27.01

27.41

27.80

28.21

27.28

27.64

28.06

28.48

28.86

27.84

28.25

28.65

29.08

29.48

28.44

28.85

29.28

29.68

30.12

29.02

29.44

29.88

30.29

30.72

29.59

30.02

30.48

30.90

31.31

30.17

30.61

31.05

31.48

31.91

41

42

43

44

45

10.77

10.97

11.17

11.36

11.56

12.91

13.14

13.36

13.59

13.81

14.54

14.78

15.03

15.27

15.51

15.90

16.15

16.42

16.68

16.94

17.11

17.39

17.66

17.93

18.20

18.21

18.50

18.79

19.07

19.36

19.24

19.53

19.83

20.13

20.42

20.19

20.50

20.81

21.12

21.42

21.09

21.41

21.73

22.05

22.37

21.97

22.30

22.62

22.95

23.27

22.81

23.14

23.47

23.80

24.13

23.60

23.95

24.29

24.63

24.97

24.38

24.73

25.08

25.42

25.77

25.12

25.49

25.86

26.22

26.54

25.86

26.22

26.59

26.95

27.31

26.56

26.94

27.31

27.68

28.04

27.27

27.65

28.02

28.39

28.76

27.94

28.33

28.71

29.10

29.47

28.60

28.99

29.38

29.77

30.16

29.26

29.65

30.05

30.44

30.83

29.90

30.30

30.69

31.10

31.48

30.51

30.93

31.33

31.74

32.15

31.13

31.56

31.95

32.37

32.77

31.76

32.17

32.58

33.00

33.41

32.34

32.77

33.19

33.61

34.03

46

47

48

49

50

11.75

11.95

12.14

12.33

12.53

14.03

14.30

14.47

14.69

14.91

15.75

15.99

16.23

16.47

16.71

17.20

17.45

17.71

17.96

18.21

18.48

18.74

19.01

19.28

19.54

19.64

19.92

20.20

20.48

20.75

20.71

21.01

21.30

21.58

21.87

21.72

22.03

22.32

22.62

22.92

22.68

23.00

23.31

23.62

23.90

23.59

23.91

24.23

24.54

24.85

24.46

24.79

25.11

25.44

25.76

25.30

25.64

25.97

26.30

26.63

26.12

26.46

26.80

27.13

27.47

26.89

27.23

27.59

27.94

28.28

27.67

28.02

28.37

28.72

29.07

28.41

28.76

29.13

29.48

29.84

29.14

29.51

29.87

30.23

30.59

29.84

30.21

30.60

30.96

31.32

30.54

30.91

31.16

31.67

32.03

31.22

31.60

31.98

32.36

32.74

31.90

32.27

32.66

33.05

33.43

32.54

32.94

33.32

33.72

34.10

33.18

33.59

33.98

34.39

34.77

33.81

34.23

34.63

35.02

35.43

34.44

34.85

35.26

35.67

36.07

M.E.D. = D1 - D

2

loge D

1 D2

M. E. D. Logarithmic Mean Effective Temperature Difference (between the air and heat transfer fluid)

Table 5 - cont.

WhereD

1 = larger T.D. between air and fluid

D2 = smaller T.D. between air and fluid

D1

orD

1 or D

2

D2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

51

52

53

54

55

12.72

12.91

13.10

13.30

13.48

15.13

15.35

15.56

15.78

15.99

16.94

17.18

17.41

17.64

17.88

18.46

18.71

18.96

19.21

19.46

19.81

20.07

20.34

20.59

20.85

21.03

21.30

21.57

21.85

22.12

22.16

22.44

22.72

23.01

23.29

23.21

23.51

23.80

24.09

24.38

24.20

24.51

24.81

25.11

25.42

25.17

25.47

25.78

26.09

26.40

26.08

26.40

26.71

27.03

27.34

26.95

27.28

27.60

27.92

28.24

27.80

28.13

28.46

28.79

29.12

28.62

28.95

29.28

29.63

29.96

29.42

29.76

30.11

30.45

30.79

30.19

30.54

30.89

31.24

31.58

30.95

31.31

31.67

32.02

32.37

31.69

32.05

32.41

32.77

33.12

32.41

32.78

33.15

33.51

33.87

33.12

33.49

33.86

34.23

34.60

33.80

34.19

34.56

34.95

35.31

34.50

34.87

35.26

35.63

36.01

35.17

35.55

35.95

36.32

36.71

35.82

36.21

36.61

37.00

37.37

36.47

36.87

37.26

37.66

38.05

56

57

58

59

60

13.66

13.85

14.04

14.22

14.41

16.21

16.42

16.63

16.84

17.05

18.11

18.34

18.57

18.80

19.03

19.70

19.95

20.19

20.44

20.68

21.02

21.37

21.63

21.88

22.13

22.39

22.65

22.92

23.19

23.45

23.56

23.84

24.12

24.39

24.67

24.67

24.95

25.24

25.52

25.81

25.71

26.01

26.31

26.58

26.88

26.70

27.00

27.31

27.61

27.90

27.65

27.96

28.27

28.58

28.89

28.56

28.88

29.20

29.51

29.82

29.44

29.77

30.09

30.42

30.73

30.30

30.63

30.94

31.27

31.62

31.13

31.46

31.79

32.13

32.46

31.93

32.27

32.61

32.95

33.29

32.72

33.07

33.41

33.76

34.10

33.48

33.84

34.19

34.54

34.88

34.23

34.59

34.94

35.30

35.65

34.97

35.33

35.69

36.05

36.41

35.68

36.06

36.42

36.78

37.15

36.39

36.76

37.14

37.51

37.88

37.08

37.47

37.83

38.22

38.58

37.78

38.15

38.53

38.91

39.29

38.44

38.83

39.21

39.59

39.98

61

62

63

64

65

14.60

14.78

14.96

15.15

15.33

17.26

17.47

17.68

17.89

18.10

19.26

19.48

19.71

19.93

20.16

20.92

21.16

21.40

21.64

21.88

22.39

22.64

22.89

23.14

23.39

23.72

23.98

24.24

24.50

24.76

24.94

25.22

25.49

25.77

26.03

26.09

26.37

26.65

26.93

27.21

27.17

27.46

27.75

28.04

28.33

28.20

28.50

28.80

29.09

29.38

29.19

29.49

29.80

30.10

30.40

30.14

30.45

30.76

31.06

31.37

31.05

31.37

31.68

31.99

32.31

31.93

32.26

32.58

32.91

33.23

32.79

33.12

33.45

33.77

34.10

33.62

33.96

34.29

34.62

34.95

34.44

34.78

35.12

35.46

35.79

35.23

35.58

35.92

36.26

36.60

36.00

36.36

36.71

37.06

37.40

36.77

37.12

37.48

37.83

38.18

37.51

37.88

38.23

38.58

38.94

38.24

38.61

38.97

39.33

39.69

38.96

39.32

39.70

40.05

40.43

39.66

40.04

40.41

40.77

41.16

40.36

40.74

41.11

41.49

41.86

66

67

68

69

70

15.51

15.70

15.88

16.06

16.24

18.30

18.51

18.72

18.92

19.13

20.38

20.61

20.83

21.05

21.27

22.12

22.35

22.59

22.82

23.06

23.64

23.89

24.14

24.38

24.63

25.02

25.28

25.54

25.80

26.05

26.29

26.56

26.83

27.10

27.36

27.49

27.76

28.04

28.31

28.62

28.61

28.90

29.17

29.45

29.73

29.68

29.97

30.26

30.55

30.83

30.70

30.99

31.29

31.59

31.88

31.68

31.98

38.28

32.59

32.89

32.62

32.93

33.24

33.55

33.86

33.55

33.87

34.18

34.48

34.80

34.42

34.75

35.07

35.38

35.71

35.28

35.61

35.94

36.26

36.59

36.13

36.46

36.79

37.12

37.45

36.94

37.29

37.61

37.95

38.29

37.34

38.09

38.43

38.77

39.11

38.53

38.88

39.22

39.57

39.91

39.29

39.66

40.00

40.35

40.70

40.05

40.41

40.76

41.12

41.47

40.79

41.15

41.57

41.87

42.23

41.52

41.90

42.25

42.62

42.96

42.23

42.60

42.97

43.34

43.71

71

72

73

74

75

16.42

16.60

16.78

16.96

17.14

19.33

19.53

19.79

19.94

20.14

21.49

21.71

21.93

22.15

22.37

23.29

23.53

23.76

23.99

24.22

24.87

25.12

25.36

25.61

25.85

26.31

26.56

26.81

27.07

27.32

27.62

27.89

28.15

28.41

28.68

28.86

29.13

29.40

29.67

29.94

30.02

30.30

30.58

30.86

31.33

31.12

31.41

31.69

31.98

32.26

32.18

32.33

32.76

33.05

33.34

33.19

33.49

33.79

34.08

34.38

34.16

34.47

34.77

35.08

35.38

35.11

35.42

35.72

36.04

36.35

36.02

36.34

36.65

36.97

37.28

36.91

32.73

37.55

37.87

38.19

37.81

38.10

38.43

38.76

39.08

38.62

38.95

39.28

39.61

39.94

39.44

39.79

40.12

40.45

40.79

40.26

40.60

40.94

41.27

41.61

41.04

41.39

41.74

42.08

42.42

41.82

42.17

42.52

42.87

43.22

42.58

42.94

43.29

43.65

44.00

43.34

43.69

44.04

44.41

44.76

44.07

44.42

44.79

45.15

45.51

76

77

78

79

80

17.32

17.50

17.67

17.85

18.36

20.34

20.54

20.74

20.94

21.44

22.59

22.80

23.02

23.24

23.40

24.45

24.68

24.91

25.14

25.37

26.09

26.34

26.57

26.81

27.05

27.57

27.82

28.07

28.32

28.57

28.94

29.19

29.45

29.71

29.98

30.20

30.47

30.74

31.00

31.27

31.41

31.67

31.95

32.22

32.50

32.54

32.82

33.10

33.38

33.66

33.63

33.92

34.20

34.49

34.78

34.67

34.97

35.26

35.55

35.85

35.68

35.98

36.28

36.58

36.87

36.65

36.96

37.26

37.57

37.87

37.75

37.90

38.21

38.52

38.83

38.51

38.82

39.14

39.45

39.77

39.40

39.72

40.04

40.36

40.68

40.27

40.59

40.92

41.24

41.57

41.12

41.44

41.78

42.11

42.43

41.95

42.28

42.62

42.95

43.28

42.76

43.10

43.44

43.78

44.11

43.55

43.90

44.25

44.58

44.93

44.35

44.69

45.04

45.38

45.73

45.11

45.47

45.81

46.16

46.52

45.87

46.23

46.58

46.93

47.28

81

82

83

84

85

18.5

18.7

18.9

19.0

19.1

21.7

21.9

22.0

22.1

22.2

23.9

24.2

24.3

24.5

24.7

25.8

26.0

26.2

26.3

26.5

27.4

27.7

27.9

28.0

28.2

29.0

29.2

29.4

29.7

30.0

30.4

30.6

30.9

31.0

31.2

31.5

31.8

32.0

32.1

32.3

32.9

33.1

33.4

33.6

33.9

34.0

34.2

34.6

34.9

35.1

35.1

35.5

35.7

36.0

36.2

36.2

36.5

36.8

37.0

37.3

37.2

37.5

37.8

38.0

38.3

38.3

38.5

39.0

39.2

39.5

39.1

39.4

39.7

40.0

40.2

40.1

40.4

40.8

41.0

41.3

41.0

41.4

41.7

42.0

42.2

42.0

42.3

42.6

43.0

43.1

42.7

43.0

43.3

43.5

44.0

43.6

43.9

44.1

44.5

44.9

44.3

44.8

45.0

45.3

45.7

45.3

45.7

46.0

46.3

46.7

46.0

46.4

46.8

47.1

47.4

47.0

47.2

47.6

48.0

48.2

47.6

48.0

48.3

48.6

49.0

86

87

88

89

90

19.2

19.3

19.5

19.7

19.8

22.4

22.7

22.9

23.0

23.1

24.9

25.0

25.2

25.5

25.7

26.8

27.0

27.2

27.3

27.6

28.5

28.8

29.0

29.2

29.4

30.1

30.3

30.6

30.9

31.0

31.7

31.9

32.1

32.3

32.6

32.7

33.0

33.1

33.4

33.7

34.1

34.4

34.6

34.9

35.1

35.4

35.8

36.0

36.2

36.5

36.5

36.9

37.0

37.3

37.4

37.6

38.0

38.1

38.5

38.8

38.6

39.0

39.2

39.5

39.8

39.8

40.1

40.3

40.7

41.0

40.5

40.9

41.2

41.5

41.8

41.7

42.0

42.3

42.6

42.9

42.5

42.9

43.2

43.5

43.8

43.5

43.9

44.2

44.5

44.9

44.3

44.6

45.0

45.2

45.5

45.1

45.5

45.9

46.1

46.5

46.0

46.3

46.6

47.0

47.3

47.0

47.3

47.6

48.0

48.2

47.8

48.0

48.3

48.8

49.1

48.6

49.0

49.3

49.6

50.0

49.3

49.7

50.0

50.3

50.7

91

92

93

94

95

20.0

20.1

20.2

20.4

20.6

23.4

23.6

23.8

24.0

24.1

25.9

26.0

26.2

26.4

26.7

27.9

28.0

28.2

28.4

28.6

29.7

29.9

30.1

30.3

30.5

31.3

31.5

31.8

32.0

32.2

32.9

33.1

33.3

33.7

33.9

34.0

34.2

34.4

34.8

35.0

35.4

35.6

36.0

36.2

36.4

36.8

37.0

37.2

37.5

37.9

37.9

38.1

38.3

38.7

39.0

39.0

39.2

39.6

39.9

40.1

40.0

40.3

40.7

41.0

41.2

41.2

41.6

41.9

42.1

42.5

42.1

42.4

42.8

43.0

43.2

43.1

43.4

43.8

44.0

44.2

44.1

44.4

44.8

45.0

45.2

45.2

45.5

45.8

46.1

46.4

45.9

46.2

46.6

46.9

47.1

46.8

47.0

47.3

47.7

48.0

47.7

48.0

48.3

48.6

49.0

48.6

49.0

49.3

49.6

50.0

49.4

49.8

50.1

50.5

50.9

50.3

50.7

51.0

51.3

51.7

51.0

51.3

51.8

52.0

52.4

96

97

98

99

100

20.8

20.9

21.0

21.2

21.3

24.2

24.4

24.6

24.8

25.0

26.9

27.0

27.2

27.4

27.6

28.9

29.1

29.3

29.5

29.7

30.8

31.0

31.1

31.3

31.5

32.4

32.7

32.9

33.0

33.2

34.0

34.2

34.6

34.8

35.0

35.2

35.5

35.7

36.0

36.2

36.7

37.0

37.2

37.4

37.6

38.0

38.2

38.5

38.9

39.1

39.2

39.5

39.9

40.1

40.3

40.4

40.7

41.0

41.2

41.5

41.5

41.9

42.1

42.3

42.6

42.8

43.0

43.2

43.6

43.9

43.5

44.0

44.2

44.5

44.9

44.7

45.0

45.2

45.5

45.8

45.7

46.0

46.2

46.7

47.0

46.8

47.0

47.4

47.8

48.0

47.5

47.9

48.1

48.5

48.9

48.2

48.6

49.0

49.2

49.5

49.3

49.6

50.0

50.2

50.5

50.2

50.5

50.9

51.2

51.5

51.1

51.5

51.9

52.1

52.5

52.0

52.3

52.8

53.0

53.2

52.8

53.1

53.4

53.9

54.1

- 25 -

STANDARD COIL CIRCUITINGFOR KWH, KWS AND KWD COILS

Table 6 NUMBER OF TUBES FED

- 26 -

WETTED SURFACE FACTOR (WSF)Figure 3

ENT. AIR D.P. - ENT. WATER TEMP.*NOTE: For Dry Cooling (S/T ratio of .90 or Higher) Use a WSF Equal to 1.0

* Other circuiting arangements available for special applications. Consult factory when necessary.** Direction of air flow - horizontal or vertical - must be specified when ordering KWH Coils. All connections are on one end.† Supply and return connections are on opposite ends of 1, 3, 5, 7 and 9 row KWS Coils and 2, 6 and 10 row KWD Coils.

* TYPE"W" DIMENSION INCHES

6 9 12 15 18 21 24 27 30 33 36

** KWH 2 3 4 5 6 7 8 9 10 11 12

† KWS 4 6 8 10 12 14 16 18 20 22 24

† KWD 8 12 16 20 24 28 32 36 40 44 48

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

*1.0

WE

TT

ED

SU

RF

AC

E F

AC

TO

R (W

SF

)

0 5 10 15 20 25 30 35 40 45 50

- 27 -

FIN CORRECTIONTable 7

FIN SERIESFFR - FIN SERIESCORRECTION

FACTOR TO "U"

70 .87

80 1.00

100 1.16

120 1.29

HEAT TRANSFER COEFFICIENTFigure No. 4

200

190

180

170

160

150

140

130

120

110

100200 300 400 500 *600 700 800

“U”

= B

TU

PE

R H

R -

SQ

FT

FA

CE

AR

EA

- D

EG

ME

D -

RO

W D

EE

P

For efficient operation, water velocity should normally be between 2 and 4 FPS.

FACE VELOCITY - FEET PER MINUTE (STD. AIR) *Maximum recommended air velocity.

- 28 -

WET BULB DEPRESSION FACTORSFIGURE 5 70-80-100-120 FIN SERIES

Figure 5a70 FINSERIES

Figure 5b80 FINSERIES

Figure 5c100 FINSERIES

Figure 5d120 FINSERIES

WE

T B

UL

B D

EP

RE

SS

ION

FA

CT

OR

WE

T B

UL

B D

EP

RE

SS

ION

FA

CT

OR

WE

T B

UL

B D

EP

RE

SS

ION

FA

CT

OR

WE

T B

UL

B D

EP

RE

SS

ION

FA

CT

OR

0.30

0.20

0.10

0200 300 400 500 *600 700 800

3 ROWS DEEP

4

5

6

810

3 ROWS DEEP

4

5

6

810

3 ROWS DEEP

4

5

6

810

3 ROWS DEEP

4

5

6 810

0.30

0.20

0.10

0

0.30

0.20

0.10

0

0.30

0.20

0.10

0

200 300 400 500 *600 700 800

200 300 400 500 *600 700 800

200 300 400 500 *600 700 800

FACE VELOCITY - FPM (STD. AIR)*Maximum recommended air velocity

AIR PRESSURE DROPFigure 6

- 29 -

1. AIR FRICTION - DRY COILS

Air Friction Dry = 0.41 Inches of Water for 80 Fin

Series, 500 FPM and 6 Rows Deep.

Air Friction for Dry Coils from Figure 6, above.

EXAMPLE PROBLEM NO. 3(Showing use of Air Friction Figure No. 6 and Table No. 8)

GIVEN:Coil Model..................................................................................................... KWS106-30x60Coil Face Velocity.......................................................................................... 500 FPM

Fw equals 1.35† for wet coils in the normal air conditioning range, For conditions outside thenormal air conditioning range (extreme humidity conditions) with air velocities over 350 feet perminute and with vertical up air flow, the wet coil air friction factor can be as high as 1.75. Consult

the factory in the case of such unusual applications.

†For lower humidity conditions lower values of Fw can be used. F

w equals approximately 1.12 when the

temperature difference is 10°F or less between entering air dewpoint and entering refrigerant Fw equalsapproximately 1.24 when the temperature difference is 11°F to 18°F between air dewpoint and entering

refrigerant.

SOLUTION

2. AIR FRICTION-WET COILS Air Friction Wet = Air Friction Dry x Fw x FFr = 0.41 x 1.35 x 1.16 = 0.64 In. of Water Fw = 1.35 for normal air conditioning applications. (See above recommendations for other than normal applications.)

Ffr = 1.16 for 100 fin series from Table 8, above.

AIR FRICTION 80 FIN SERIES DRY COILS

AIR

SID

E F

RIC

TIO

N L

OS

S (I

NC

HE

S O

F W

AT

ER

) 1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0200 300 400 500 *600 700 800

AIR FRICTION FIN SERIES CORRECTION FACTORSTable 8

8

6

5

4

3

FACE VELOCITY - FEET PER MINUTE (STD. AIR) *Maximum recommended air velocity.

FIN SERIES FIN FACTOR Ffr

70 .87

80 1.00

100 1.16

120 1.33

10

8

6

5

4

3

ROW

S DEE

P

WATER PRESSURE DROPFigure 7

- 30 -

GPM PER FEED

WATER PRESSURE DROP CORRECTION FACTORSAND EXAMPLE PROBLEMS

- 31 -

1. GPM PER FEED GPM/Feed = GPM = 60 = 3.0

No. Feeds 20 No. Feeds from Table 6, page 26.

2. BASE WATER PRESSURE DROP

Pd = 5.7 Feet of Water for 3.0 GPM/Feed and

6 Rows DeepP

d from Figure 7, opposite page.

EXAMPLE PROBLEM NO. 4(Showing use of Water Pressure Drop Figure No. 7 and Table No. 9)

GIVEN:Coil Model..................................................................................KWS106-30x60Gallons Per Minute...................................................................................... 60GPM

SOLUTION

WATER PRESSURE DROP COIL TYPENTL CORRECTION FACTORS

Table 9

3. NTL CORRECTION FACTOR

NTL Correction Factor = 0.88 for a Type KWS Coil and 60” NTL NTL Correction Factor from Table 9, below.

4. WATER PRESSURE DROP

Water Pressure Drop = Pd x NTL Correction Factor = 5.7 x 0.88 = 5.02 Feet H2O

NOMINALTUBE LENGTHNTL (Inches)

COIL TYPE

KWH KWS KWD

1224

.70

.95.38.51

.22

.28

3648

1.201.45

.63

.75.34.41

6072

1.691.94

.881.00

.47

.53

8496

2.192.44

1.121.25

.59

.65

108120

2.692.93

1.371.50

.72

.78

132144

3.183.43

1.621.74

.84

.90

DIMENSIONAL DRAWINGS

COIL DEPTH

NOTE: Headers May Extend Beyond Dimension “D”- 32 -

TYPE KWS WATER COILSINGLE SERPENTINE1, 3, 5, 7 and 9 row coils havesupply and return connections atopposite ends of coil.

2, 4, 6. 8, 10 and 12 row coilshave supply and returnconnections at same ends of coil.Right-hand coil shown.L.H. coil reverse headers.

TYPE KWH WATER COILHALF SERPENTINE

Supply and return connectionsare always on the same endof the coil regardless of rowsdeep.Right-hand coil shown. L.H. coilreverse headers.

TYPE KWD WATER COILDOUBLE SERPENTINE

2, 6 and 10 row coils have supplyand return connections at oppositeends of coil.

Right-hand coil shown. L.H. coilreverse headers.

SUPPLY AND RETURNCONNECTIONSCOPPER TO MPT.

“E”“E”

VENT

“A”

Figure No. 8

Figure No. 9

Figure No. 10

SUPPLY AND RETURNCONNECTIONSCOPPER TO MPT.

SUPPLY AND RETURNCONNECTIONSCOPPER TO MPT.

AIR

FLOW

3/8” DIA. HOLES

3/8” DIA. HOLES

3/8” DIA. HOLES

SUPPLY

3/4”

“W”

3/4”

3/4”

3/4”

3/4”

1 1/2”

1 1/2”

1 1/2”

4” MAXDRAIN

N.T.L.

4” MAX.ON ODD

ROW COILS3/8” MAX.ON EVEN

ROW COILS

“D”

4 1/4”RETURN

W • 3

“ A “

3/4”

3/8”

DIA

. HO

LES

“E”

“ E ”

VENT

“A”

AIR

FLOW

SUPPLY

3/4”

“W”

3/4”

3/4”

3/4”

3/4”

1 1/2” 1 1/2”

1 1/2”

1 1/2”

4” MAX

DRAIN

N.T.L.

N.T.L.•3’

4” MAX.ON 1 & 2

ROW COILS1” MAX.

ON 4 TO 10ROW COILS

“D”

4 1/4”RETURN

W • 3

“ A “

3/4”

3/8”

DIA

. HO

LES

1 1/2”

N.T.L.•3’

“ E”

“E”

“A”

AIR

FLOW

SUPPLY3/4”

“W”

3/4”

3/4”

1 1/2”

1 1/2” 1 1/2”4” MAX

DRAIN

N.T.L.

4” MAX.ON 2, 6, 10 & 12

ROW COILS1” MAX.

ON 4 & 8ROW COILS

“D”

4 1/4”RETURN

W • 3’

3/8”

DIA

. HO

LES

“A”

3/4”

1 1/2”

3/4”VENT

3/4”

COIL CONNECTION SIZES

MODEL ROWS 1 2 3 4 5 6 7 8 9 10 12

KWS &KWH

DIM."D"

5" 5" 6" 7 1/2" 9" 10 1/2" 12" 13 1/2" 15"16

1/2"19

1/2"

KWDDIM."D"

- 5" - 7 1/2" - 10 1/2" - 13 1/2" -16

1/2"19

1/2"KWS &KWH

DIM."E"

2 1/2" 1 3/4" 1 3/4" 1 7/8" 2" 2" 2 1/8" 2 1/4" 2 1/4" 2 3/8" 2 5/8"

KWDDIM."E"

- 2 3/4" - 2 3/8" - 2 5/8" - 2 7/8" - 3" 3 1/2"

TOTAL

G.P.M.0-10 11-20 21-30 31-50 51-80 81-125 126-175

HEADER

AND CONN.

SIZE

1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 3 1/2"

DIM. "A" 1 7/8" 1 7/8" 1 7/8" 2 1/16" 2 5/16" 2 9/16" 2 13/16"

1. Piping should be in accordance with accepted industry standards.

2. When drainable coils are desired, tubes should be installed in a horizontal position. Use a spirit level.

3. When cooling coils are banked two or three high, a drain gutter should be installed on the leaving air side of each coil to collect the condensate. On high latent installations the condensate draining from top coils would load the lower coils with condensate and a significant reduction in air flow and performance may result. All individually installed water cooling coils and the bottom coils of all cooling coil banks should be mounted in drain pans extending approximately ten inches from the leaving air edge of the coil.

4. When installing KWH Coils, care should be exercised to assure that the coil is installed so that it is drainable.

5. When fresh air and return air are to be cooled by a water coil, care should be exercised in the design of the ductwork to insure thorough mixing before the air enters the coil. Introducing the fresh air into the top of the duct and the return air into the bottom of the duct has a natural tendency for better mixing during the winter season.

APPLICATION RECOMMENDATIONS

The greater the distance between the point of mixing and the coil the better. If large quantities of fresh air below 40°F. are introduced into the system, steam distributing coils should be installed in the fresh air duct as preheaters to raise the air temperature to a minimum of 40°F. This holds true unless the water coil is drained and filled with antifreeze. On any system that has fresh air introduced in the winter season, a temperature sensitive control should be installed to provide protection from freezing. If a safety control is used, some consideration should also be given to prevent overheating.

6. Control of water cooling coils can be accomplished by two position control valves, modulating valves, three way valves, face and bypass dampers or a combination of these controls means. Follow the recommendations of the control manufacturer regarding types, sizing and locations.

7. The pipe sizes for the system must be selected on the basis of the head (pressure) available from the circulating pump. It is recommended that the velocity should not generally exceed 8’feet per second and that the friction loss should be approximately 3 ft. per 100 ft. of pipe. The following table will aid in selecting piping for various flow ratio and friction losses.

PIPE SIZE SELECTION CHARTFigure 11

3/8” 1/2” 3/4” 1” 1 1/4” 1 1/2” 2” 3” 4” 5”6”

8”

10”

1 1.5 2 2.5 3 4 5 6 8 10 15 20 25 30 40 50 60 80 100 150 200 250 300 400 500 600 800 1000 1500 2000 2500

252015

10 8 6 5 4

3 2.5

2.

1.5

FR

ICT

ION

LO

SS

IN F

T. P

ER

100

FT

.

1 .8 .6 .5 .4 .3

.25 .2 .15

.1

FLOW RATE (GPM)

- 33 -

(Prepared from data in Heating Ventilating Air Conditioning Guide)The following properties of air are shown on the chart and when any two (2) areknown the others can be determined by following the arrows as indicated in Figure 12

Dry-Bulb (DB)Wet Bulb (WB) and/or *Enthalpy (hs)Dew-Point (DP) and/or Moisture-Content (MC)Relative-Humidity (RH)

*The Enthalpy values shown are the total heat contents of moist air at saturation inBTU per lb. of dry air. For conditions other than saturation, within the range of comfortair conditioning, the enthalpies will be slightly different, but the maximum error will beless than approximately one per cent and hence these enthalpies can be safely used.If greater accuracy is required - follow the procedure in Heating Ventilating AirConditioning Guide.

AIR MIXTURES(See Figure 13)

Most air conditioning systems usually mix some fresh air (for ventilation) with therecirculated air before it reaches the cooling coils. For all practical purposes theresulting DB, WB, DP, etc., of the mixture lies on a straight line drawn between thetwo (2) points on the chart that represent the properties of the fresh air (tr) and therecirculated air (tr).

1000 CFM fresh air @ 95° DB = 95,0004000 CFM ree. air @ 80° DB = 320,0005000 415,000

415,000 = 83°F. DB mixture temperature (tm) 5,000

Locate this point on the straight line and all the other properties of the air mixturecan be determined on the chart.

AIR CONDITIONING PROCESS(See Figure 14)

The chart is important for tracing the change of state of air as it is processed. Onefundamental principle should always be remembered: The Dew-Point is CONSTANT ifthe moisture-content is constant.Heating (sensible) is indicated on a horizontal line extending to the right. Cooling(sensible) is indicated on a horizontal line extending to the left. Humidification isindicated on a vertical line extending upwards. Dehumidification is indicated on avertical line extending downwards. When air is heated by a steam coil and moisture isalso added, the line extends upward to the right; when air passes thru a spray ofrecirculated water it is cooled upwards to the left along the WB line; when the sprayedwater is chilled the air is cooled and dehumidified to the left and upward or downwarddepending on the water temperature. When air is cooled by cooling coils the lineextends to the left and horizontal if the temperature of the cooling fluid is above theDP of the entering air, and the line extends to the left and downward if thetemperature of the cooling fluid is below the DP of the entering air.

STRAIGHT LINE FUNCTION(See Figure 15)

For all practical purposes in solving air conditioning comfort problems, the chart isused to assist in determining what method of processing is necessary to achieve thedesired conditions. (1) Draw a straight line connecting the points, (tf) fresh air, and(t,) recirculated air. On this line locate the point (tm), representing the.condition of theair mixture. (2) Draw a straight line through the point (tr) and the point (t1), which pointrepresents the required coil leaving air temperature necessary to remove the totalheat load. (3) Draw a straight line connecting the point (tm) and the point (t1), andextending it beyond (ti). The S/T ratio of the coil selected must be equal to or lowerthan the S/T ratio of this line tm - t1. If air conditions such as represented by a point(th) in Figure 5 must be attained, reheat is required.

VOLUME OF AIR (cu. ft. per lb. dry air)The specific volume of air varies (a) directly with its absolute temperature, (b)inversely as its absolute pressure, and (c) slightly with change in Relative Humidity,although these variations are slight when considering the normal comforttemperatures, these values are plotted.

PSYCHROMETRIC FUNCTIONS

Figure 12

Figure 15

Figure 14

Figure 13

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PSYCHROMETRIC CHART

DRY-BULB TEMPERATURES - °F

Figure 16Barometric Pressure 29.92” Hg.

SENSIBLE HEAT RATIO = SENSIBLE HEAT

TOTAL HEAT

MO

IST

UR

E C

ON

TE

NT

- G

RA

INS

PE

R P

OU

ND

OF

DR

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IR

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ENGINEERING SPECIFICATIONSWATER COOLING COILS

The contractor shall supply and install as shown on theplans, non-ferrous Water Cooling Coils of extended surface,staggered tube, rippled continuous plate fin type. Coilsshall be as manufactured by National refrigeration & AirConditioning Products Inc.

COILS shall have copper or brass M.P.T.connections forL.H. or R.H. connections as required. Coils shall be circuitedfor counter-flow heat transfer to provide the maximum meaneffective temperature difference for maximum heattransfer rates.The use of internal restrictive devices to obtain turbulentflow will not be acceptable since they prevent completedraining of the coil and give high water pressure drop.

PRIMARY SURFACE shall be round, -5/8" O.D. coppertubing of suitable wall thickness brazed into header tubeholes using copper brazing alloys. Tubes shall bestaggered in the direction of airflow.

SECONDARY SURFACE shall consist of rippled aluminumcontinuous plate fins maximum 36" length of suitablethickness for maximum capacity, structural strength andminimum air frictional resistance. Fins shall have full drawncollars to provide continuous surface cover over the entiretube and be free from sharp edges which accumulate lintand dirt.

Bare copper tube shall not be visible between the fins.Tubes shall be expanded into the fins to provide acontinuous primary to secondary compression bond overthe entire finned length for maximum heat transfer rates.

CASINGS shall be constructed of continuous galvanizedsteel of suitable thickness with 3/8" diameter bolt holesfor mounting. Top and bottom plates will have double breaktype flanges to form a ‘box-shape’ section. Coil side platesshall be of reinforced single flange type with extruded tubeholes to give maximum tube support. Coils shall besuitable for easy stacking in banks if so required.

WATER HEADERS shall be extra heavy gaugeseamless copper tubing to permit expansion andcontraction without creating undue stress or strain. Rolledin or welded seams or dissimilar metals will not beacceptable..

TESTS shall be a minimum of 300 PSIG air pressureunder warm water and shall be made on completed coils.Individual tube tests or core tests before headerinstallation or hydrostatic tests only will not beconsidered satisfactory and not be acceptable. All coilsshall be guaranteed for 200 PSIG working pressures.

OTHER STANDARD OR CUSTOM COILS AVAILABLEFOR EVERY REQUIREMENT OR ANY DESIGN LOAD

• STEAM COILS• TYPE B BOOSTER COILS

• TYPE KDX DIRECT EXPANSION REFRIGERATION/AIR CONDITIONING

USC

CANADA159 ROY BLVD., BRANTFORD, ONTARIO, CANADA N3R 7K1PHONE: 1-800-463-9517 (519)751-0444 FAX (519)753-1140

Due to National Refrigeration’s policy of continuous product improvement, we reserve the right to make changes without notice.

USA985 WHEELER WAY, LANGHORNE, PA. 19047 USAPHONE:1-888-KEEPUS1 OR 1-888-533-7871

NATIONAL REFRIGERATION &AIR CONDITIONING CANADA CORP.