Upload
najwa-syafiqa
View
217
Download
0
Embed Size (px)
Citation preview
8/6/2019 425 1 Design Temps Lecture and HW
1/17
ME 425 Overview & Design Conditions
ME 425
Air Conditioning System Design
Keith E. Elder, P.E.
ME 425
In enclosed spaces, the combinedtreatment of the air to control, as
specified, temperature, relative humidity,velocity of motion, and radiant heatenergy level, with consideration of theneed for removal of air-borne particlesand contaminant gases.
8/6/2019 425 1 Design Temps Lecture and HW
2/17
ME 425 Overview & Design Conditions
ME 425
Chilled Water Pump
Heat
Exchanger
Heat
Exchanger
Compressor Expansion
Valve
Cooling
Coil
Fan
ColdAir
WarmAir
Warm
Water
Chilled
Water
Hot
Gas
GasCondensed
Liquid
CoolingTower Condenser
Pump
Hot
Water
WarmMoist Air
Cooler
DryerAir
Warm
Water
Emphasis ofME 425
ME 425
Formal Version
)/Btuin(5.4
)/in(4840
min)/in&Btu/hrin(1.1 3
airtotal
airwaterlatent
sensible
lbmhhQq
lbmlbmWWQq
ftQqtQq
Designers Version (based on air volume)
hmq
Wmq
tcmq
total
latent
psensible
8/6/2019 425 1 Design Temps Lecture and HW
3/17
ME 425 Overview & Design Conditions
ME 425
Calculate Sensible & Latent loads
Determine space air quantities
Select & layout diffusers
Layout & size ductwork
Select Air Handler(s)
Calculate Coil Loads & Select Coil(s)
Pipe coils & select pumps
Select primary systems (chillers, boilers)
Write specifications (including controls)
ME 425
Major Steps in Load Calculations
Determine indoor/outdoor design conditions
Research & Calculate thermal properties ofenvelope components
Determine zoning
Perform Area Takeoffs
Calculate Space Sensible & Latent Loads
Determine Ventilation & Other SystemEffects
Calculate Coil Loads
8/6/2019 425 1 Design Temps Lecture and HW
4/17
ME 425 Overview & Design Conditions
ME 425
Indoor Conditions (Comfort-based) Indoor Dry Bulb Temperature
Indoor Relative Humidity
Outdoor Conditions (Statistical-based) Dry Bulb Temperature
Mean Coincident Wet Bulb Temperature
Daily Range
Degree Days
Ground Temperatures
ME 425
Dry Bulb Temperature
8/6/2019 425 1 Design Temps Lecture and HW
5/17
ME 425 Overview & Design Conditions
ME 425
ME 425
Indoor Dry Bulb Temperature
Indoor Relative Humidity
Temperature Stratification
Temperature Symmetry Draft
Carbon Dioxide Concentration
8/6/2019 425 1 Design Temps Lecture and HW
6/17
8/6/2019 425 1 Design Temps Lecture and HW
7/17
ME 425 Overview & Design Conditions
ME 425
Age
Activity Level
Gender (see page 8.16 under Sex)
Temperature
Relative Humidity
Dress & Activity Level
Adaptation Resignation is not adaptation
Seasonal & Circadian Rhythms
ME 425
The Comfort Chart
Comfort Based On Operative Temperature Room Humidity Heating/Cooling Mode
Op. Temp. Based On Room DB Temp. Mean Radiant Temp. Local Air Velocity
8/6/2019 425 1 Design Temps Lecture and HW
8/17
ME 425 Overview & Design Conditions
ME 425
o
The uniform temperature of a
radiantly black enclosure in
which an occupant would
exchange the same amount of
heat by radiation plus
convection as in the actual non-
uniform environment
to = Ata + (1-A)tr
ta = Local Air Temp.
A = f(air motion)
tr = Mean Radiant Temp.
Velocity(fpm) A
10 0.42
30 0.42
40 0.46
60 0.52
80 0.55
100 0.58
120 0.61140 0.63
160 0.65
ME 425
r
The uniform surface temperature of a
radiantly black enclosure in which an
occupant would exchange the same amount of
radiant heat as in the actual non-uniformenvironment.
tr = F1t1 + F2t2 + ... Fntn
Fn = Angle Factor
8/6/2019 425 1 Design Temps Lecture and HW
9/17
ME 425 Overview & Design Conditions
ME 425
n
ME 425
Determination of Outdoor Design Conditions
0
50
100
150
200
250
300
350
400
450
14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 68 71 74 77 80 83 86 90 93
AnnualTe mperature Occurence s (F)
HoursperYear
8/6/2019 425 1 Design Temps Lecture and HW
10/17
ME 425 Overview & Design Conditions
ME 425
0
50
100
150
200
250
300
350
400
450
14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 68 71 74 77 80 83 86 90 93
AnnualTemperature Occurences (F)
HoursperYear
99.6%
99.0% 1.0%
0.4%
ME 425
8/6/2019 425 1 Design Temps Lecture and HW
11/17
ME 425 Overview & Design Conditions
ME 425
ME 425
Heating Load
Design Conditions
Cooling Load
Design Conditions
8/6/2019 425 1 Design Temps Lecture and HW
12/17
ME 425 Overview & Design Conditions
ME 425
Seasonal Hours
Criteria Exceeded Representative Application
Summer
0.4% 35 Hospital, Data Center
1.0% 88 Average Project
2.0% 175 Promotional (Cut Corners)
Winter99.6 % 35 Medium Construction, 24 Occupancy
99.0% 88 Heavy Construction
ME 425
Homework for Friday Name______________________
1. A room is maintained at an air temperature of 70F.The occupant sits near a large window, which has aninside surface temperature of 50F and accounts for30% of her thermal view. The occupant hascomplained that the space feels cold. Assuming the
local air temperature to be equal to the room airtemperature:
a. What operative temperature does the occupantexperience?
b. How would you advise the HVAC technician whois trying to troubleshoot the complaint?
Reference: Chap 8 - ASHRAE Fundamentals
8/6/2019 425 1 Design Temps Lecture and HW
13/17
ME 425 Overview & Design Conditions
ME 425
Homework - Continued
2. Specify a suitable set of indoor and outdoor designconditions for each of the following
Outdoor
DB/WB
Indoor
DB/RH
Outdoor
DB
Indoor
DB
Steel & Glass Office Building
Seattle, Washington
Computer Data Center
Quantico, Virginia
Nursing HomeLong Beach, CA
Heavy Masonry Office Building
Fargo, North Dakota
SummerWinter
Reference: Chap 28 - ASHRAE Fundamentals (CD)
8/6/2019 425 1 Design Temps Lecture and HW
14/17
2005 ASHRAE Handbook - Fundamentals (IP) 2005 ASHRAE, Inc.
Station Information
1b 1c 1d 1e 1f 1g 1h 1i
FARGO 727530 46.90N 96.80W 899 14.225 -6.00 NAC 7201
Annual Heating and Humidification Design Conditions
99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD
2 3a 3b 4a 4b 4c 4d 4e 4f 5a 5b 5c 5d 6a 6b
1 -21.1 -16.5 -29.8 1.1 -20.4 -25.0 1.4 -16.0 36.5 5.0 32.8 6.4 7.9 180
Annual Cooling, Dehumidification, and Enthalpy Design Conditions
DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD
7 8 9a 9b 9c 9d 9e 9f 10a 10b 10c 10d 10e 10f 11a 11b
7 21.6 91.1 71.6 87.8 69.9 84.8 68.5 75.3 85.6 73.2 83.6 71.1 81.3 14.8 170
DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB
12a 12b 12c 12d 12e 12f 12g 12h 12i 13a 13b 13c 13d 13e 13f
72.2 123.4 81.5 69.6 112.4 79.9 67.5 104.4 77.1 31.8 86.0 29.7 83.8 27.8 81.3
Extreme Annual Design Conditions
1% 2.5% 5% Max Min Max Min Max Min Max Min Max Min Max Min
14a 14b 14c 15 16a 16b 16c 16d 17a 17b 17c 17d 17e 17f 17g 17h
28.5 25.7 23.4 82.4 97.3 -25.7 3.9 5.1 100.1 -29.4 102.4 -32.4 104.6 -35.2 107.4 -38.9
Monthly Design Dry Bulb and Mean Coincident Wet Bulb Temperatures
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18a 18b 18c 18d 18e 18f 18g 18h 18i 18j 18k 18l
0.4% 39.0 35.0 46.5 40.8 58.8 49.3 82.5 60.1 88.7 66.4 92.8 71.6
1% 36.7 33.6 43.6 39.1 55.0 46.6 78.1 57.3 86.4 65.5 90.9 71.5
2% 34.8 32.3 40.8 37.2 51.5 45.2 73.8 55.2 83.7 63.8 88.3 70.0
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18m 18n 18o 18p 18q 18r 18s 18t 18u 18v 18w 18x
0.4% 95.7 73.0 95.3 72.8 91.3 70.0 78.4 60.0 61.9 50.7 43.9 38.3
1% 92.8 73.3 92.7 72.6 87.3 67.9 74.3 58.1 57.8 48.7 40.1 35.6
2% 90.4 72.1 90.3 71.5 84.2 66.0 70.8 56.7 54.1 46.8 37.2 33.8
Monthly Design Wet Bulb and Mean Coincident Dry Bulb Temperatures
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19a 19b 19c 19d 19e 19f 19g 19h 19i 19j 19k 19l
0.4% 35.3 38.4 41.6 45.7 50.6 55.7 62.5 78.5 70.2 83.7 76.5 86.3
1% 33.9 36.2 39.3 43.0 48.0 53.9 60.0 73.7 68.5 81.2 74.6 85.3
2% 32.6 34.6 37.2 40.6 45.4 50.6 57.2 69.8 67.0 79.0 72.9 84.2
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19m 19n 19o 19p 19q 19r 19s 19t 19u 19v 19w 19x
0.4% 78.8 88.0 77.9 89.4 72.8 85.7 63.6 72.0 53.1 58.6 38.9 43.9
1% 77.4 87.2 76.1 87.2 71.0 82.0 61.2 70.1 50.2 56.1 36.0 39.5
2% 75.9 85.8 74.7 85.2 69.2 78.5 59.2 67.8 47.6 53.3 34.1 36.5
Monthly Mean Daily Temperature Range
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
20a 20b 20c 20d 20e 20f 20g 20h 20i 20j 20k 20l
17.0 16.3 15.4 20.9 22.9 21.6 21.6 22.3 22.2 20.3 15.3 15.1
WMO# World Meteorological Organization number Lat Latitude, Long Longitude,
Elev Elevation, ft StdP Standard pressure at station elevation, psi
DB Dry bulb temperature, F DP Dew point temperature, F WB Wet bulb temperature, F
WS Wind speed, mph Enth Enthalpy, Btu/lb HR Humidity ratio, grains of moisture per lb of dry air
MCDB Mean coincident dry bulb temperature, F MCDP Mean coincident dew point temperature, F MCWB Mean coincident wet bulb temperature, F
MCWS Mean coinc ident w ind speed , mph PCWD Preva il ing coinc ident wind di rect ion, , 0 = Nor th, 90 = East
Time zone
code
Coldest month WS/MCDB
0.4% 1%
Period
1a
Hours +/-
UTCElevLong
n-Year Return Period Values of Extreme DB
2%
MCWS/PCWD
to 0.4% DB
Standard deviation n=50 years
0.4% 1% 2%
Enthalpy/MCDB
Cooling DB/MCWB
MCWS/PCWD
to 99.6% DB
StdP
Humidification DP/MCDB and HR
Station name WMO#
Coldest
month
Heating DB99.6%
Lat
99%
2% 0.4%
Evaporation WB/MCDB
0.4% 2%1%
Dec
%
Jan
Feb Mar
Feb Mar
% Aug
Jun
Extreme
Max
WB
Hottest
month1%
Extreme Annual DB
Mean
Dehumidification DP/MCDB and HR
0.4% 1%
Extreme Annual WS
Hottest
month
DB range
n=5 years
JunMay
n=20 yearsn=10 years
Apr May
%
Jan
NovJul
Apr
Design conditions for FARGO, ND, USA
Aug Sep Oct Nov
Dec
%
Jul
Sep Oct
8/6/2019 425 1 Design Temps Lecture and HW
15/17
2005 ASHRAE Handbook - Fundamentals (IP) 2005 ASHRAE, Inc.
Station Information
1b 1c 1d 1e 1f 1g 1h 1i
LONG BEACH 722970 33.82N 118.15W 56 14.666 -8.00 NAP 7201
Annual Heating and Humidification Design Conditions
99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD
2 3a 3b 4a 4b 4c 4d 4e 4f 5a 5b 5c 5d 6a 6b
12 40.8 43.1 12.7 10.5 60.7 19.6 14.8 62.1 21.6 57.0 18.7 58.2 3.0 300
Annual Cooling, Dehumidification, and Enthalpy Design Conditions
DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD
7 8 9a 9b 9c 9d 9e 9f 10a 10b 10c 10d 10e 10f 11a 11b
8 16.7 91.5 68.0 87.7 67.3 84.5 66.6 72.2 84.1 70.8 82.0 69.5 79.8 9.5 280
DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB
12a 12b 12c 12d 12e 12f 12g 12h 12i 13a 13b 13c 13d 13e 13f
68.7 105.7 76.3 67.1 100.0 75.5 65.8 95.4 74.6 28.2 83.9 27.0 82.0 26.0 80.2
Extreme Annual Design Conditions
1% 2.5% 5% Max Min Max Min Max Min Max Min Max Min Max Min
14a 14b 14c 15 16a 16b 16c 16d 17a 17b 17c 17d 17e 17f 17g 17h
17.9 15.5 12.9 79.5 101.8 35.8 4.2 2.9 104.8 33.7 107.3 32.0 109.6 30.4 112.7 28.3
Monthly Design Dry Bulb and Mean Coincident Wet Bulb Temperatures
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18a 18b 18c 18d 18e 18f 18g 18h 18i 18j 18k 18l
0.4% 82.1 56.2 82.4 58.0 84.3 60.0 88.0 61.0 88.1 65.0 94.3 66.7
1% 79.2 55.6 79.3 57.4 80.1 58.9 84.3 60.5 83.8 64.6 88.9 67.1
2% 75.8 54.8 76.2 56.0 76.6 58.1 81.1 60.1 80.3 63.8 85.1 66.5
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18m 18n 18o 18p 18q 18r 18s 18t 18u 18v 18w 18x
0.4% 92.2 69.1 95.2 70.9 96.9 69.8 94.4 64.2 87.7 59.5 81.0 55.0
1% 89.1 69.4 91.4 71.1 92.9 69.3 89.9 62.8 84.1 58.7 78.2 54.7
2% 86.9 68.9 88.8 70.2 90.2 69.5 86.3 62.5 80.6 57.2 75.6 54.5
Monthly Design Wet Bulb and Mean Coincident Dry Bulb Temperatures
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19a 19b 19c 19d 19e 19f 19g 19h 19i 19j 19k 19l
0.4% 61.4 67.7 62.0 72.7 64.1 75.3 65.8 79.9 68.7 80.1 70.2 84.4
1% 60.4 66.4 61.0 69.4 62.4 72.4 64.4 77.4 67.5 78.9 69.2 82.1
2% 59.6 65.3 60.2 67.6 61.5 70.6 63.2 75.1 66.2 76.2 68.3 80.4
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19m 19n 19o 19p 19q 19r 19s 19t 19u 19v 19w 19x
0.4% 72.2 85.7 74.3 88.0 74.8 86.5 70.0 80.3 65.6 74.5 61.5 66.9
1% 71.3 84.1 73.3 86.4 73.4 83.8 69.0 78.7 64.3 72.5 60.4 66.3
2% 70.6 82.6 72.3 84.4 72.4 83.1 68.0 77.6 63.3 71.1 59.5 65.9
Monthly Mean Daily Temperature Range
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
20a 20b 20c 20d 20e 20f 20g 20h 20i 20j 20k 20l
18.9 17.4 15.7 16.9 14.2 15.1 16.2 16.7 16.8 17.3 19.9 20.4
WMO# World Meteorological Organization number Lat Latitude, Long Longitude,
Elev Elevation, ft StdP Standard pressure at station elevation, psi
DB Dry bulb temperature, F DP Dew point temperature, F WB Wet bulb temperature, F
WS Wind speed, mph Enth Enthalpy, Btu/lb HR Humidity ratio, grains of moisture per lb of dry air
MCDB Mean coincident dry bulb temperature, F MCDP Mean coincident dew point temperature, F MCWB Mean coincident wet bulb temperature, F
MCWS Mean coinc ident w ind speed , mph PCWD Preva il ing coinc ident wind di rect ion, , 0 = Nor th, 90 = East
Time zone
code
Coldest month WS/MCDB
0.4% 1%
Period
1a
Hours +/-
UTCElevLong
n-Year Return Period Values of Extreme DB
2%
MCWS/PCWD
to 0.4% DB
Standard deviation n=50 years
0.4% 1% 2%
Enthalpy/MCDB
Cooling DB/MCWB
MCWS/PCWD
to 99.6% DB
StdP
Humidification DP/MCDB and HR
Station name WMO#
Coldest
month
Heating DB99.6%
Lat
99%
2% 0.4%
Evaporation WB/MCDB
0.4% 2%1%
Dec
%
Jan
Feb Mar
Feb Mar
% Aug
Jun
Extreme
Max
WB
Hottest
month1%
Extreme Annual DB
Mean
Dehumidification DP/MCDB and HR
0.4% 1%
Extreme Annual WS
Hottest
month
DB range
n=5 years
JunMay
n=20 yearsn=10 years
Apr May
%
Jan
NovJul
Apr
Design conditions for LONG BEACH, CA, USA
Aug Sep Oct Nov
Dec
%
Jul
Sep Oct
8/6/2019 425 1 Design Temps Lecture and HW
16/17
2005 ASHRAE Handbook - Fundamentals (IP) 2005 ASHRAE, Inc.
Station Information
1b 1c 1d 1e 1f 1g 1h 1i
QUANTICO MCAS 724035 38.50N 77.30W 13 14.689 -5.00 NAE 8401
Annual Heating and Humidification Design Conditions
99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD
2 3a 3b 4a 4b 4c 4d 4e 4f 5a 5b 5c 5d 6a 6b
1 15.8 19.8 -2.0 4.9 19.2 2.8 6.4 24.9 23.4 39.4 19.9 36.5 5.9 320
Annual Cooling, Dehumidification, and Enthalpy Design Conditions
DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD
7 8 9a 9b 9c 9d 9e 9f 10a 10b 10c 10d 10e 10f 11a 11b
7 17.5 93.0 76.5 90.6 75.8 88.3 74.5 79.4 89.5 77.9 87.8 76.6 85.6 5.6 170
DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB
12a 12b 12c 12d 12e 12f 12g 12h 12i 13a 13b 13c 13d 13e 13f
76.6 138.8 85.3 75.0 131.2 83.6 73.5 124.7 81.8 35.1 89.9 33.6 88.0 32.2 85.5
Extreme Annual Design Conditions
1% 2.5% 5% Max Min Max Min Max Min Max Min Max Min Max Min
14a 14b 14c 15 16a 16b 16c 16d 17a 17b 17c 17d 17e 17f 17g 17h
18.5 16.2 13.6 90.0 97.6 7.6 3.0 7.5 99.8 2.2 101.5 -2.2 103.2 -6.4 105.4 -11.8
Monthly Design Dry Bulb and Mean Coincident Wet Bulb Temperatures
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18a 18b 18c 18d 18e 18f 18g 18h 18i 18j 18k 18l
0.4% 63.4 54.5 71.7 57.7 81.5 62.3 87.3 65.6 90.9 72.9 94.3 75.7
1% 60.8 52.3 67.4 57.0 77.0 59.6 83.1 63.9 88.5 72.0 92.3 75.1
2% 57.4 50.2 63.6 55.0 72.9 58.8 80.0 62.5 86.2 70.7 90.5 75.1
DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB DB MCWB
18m 18n 18o 18p 18q 18r 18s 18t 18u 18v 18w 18x
0.4% 97.5 78.2 95.1 76.9 92.0 76.4 83.2 70.1 74.8 62.3 70.3 60.4
1% 95.7 77.5 93.0 77.3 89.0 74.6 81.0 69.4 72.3 60.9 67.0 57.1
2% 93.6 77.2 91.3 76.8 86.7 73.4 78.6 67.9 69.1 58.4 63.6 55.6
Monthly Design Wet Bulb and Mean Coincident Dry Bulb Temperatures
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19a 19b 19c 19d 19e 19f 19g 19h 19i 19j 19k 19l
0.4% 57.6 61.2 61.5 69.7 63.8 78.0 69.7 79.7 77.5 88.2 79.4 88.7
1% 55.1 58.3 58.8 65.3 62.1 75.0 67.7 78.1 75.7 84.8 78.3 87.6
2% 53.0 56.0 55.9 63.0 60.2 70.9 65.7 75.3 73.8 81.8 77.6 86.9
WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB WB MCDB
19m 19n 19o 19p 19q 19r 19s 19t 19u 19v 19w 19x
0.4% 82.0 90.0 81.5 88.8 78.3 87.1 72.9 79.3 64.7 72.2 61.7 67.3
1% 80.8 90.2 80.0 89.0 77.1 85.2 71.2 77.3 63.3 68.6 59.3 66.2
2% 79.9 90.1 78.8 88.3 76.0 83.8 70.0 76.4 61.6 66.0 57.0 61.9
Monthly Mean Daily Temperature Range
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
20a 20b 20c 20d 20e 20f 20g 20h 20i 20j 20k 20l
15.9 16.8 18.6 20.2 19.2 18.2 17.5 16.8 17.5 19.7 18.2 16.1
WMO# World Meteorological Organization number Lat Latitude, Long Longitude,
Elev Elevation, ft StdP Standard pressure at station elevation, psi
DB Dry bulb temperature, F DP Dew point temperature, F WB Wet bulb temperature, F
WS Wind speed, mph Enth Enthalpy, Btu/lb HR Humidity ratio, grains of moisture per lb of dry air
MCDB Mean coincident dry bulb temperature, F MCDP Mean coincident dew point temperature, F MCWB Mean coincident wet bulb temperature, F
MCWS Mean coinc ident w ind speed , mph PCWD Preva il ing coinc ident wind di rect ion, , 0 = Nor th, 90 = East
Time zone
code
Coldest month WS/MCDB
0.4% 1%
Period
1a
Hours +/-
UTCElevLong
n-Year Return Period Values of Extreme DB
2%
MCWS/PCWD
to 0.4% DB
Standard deviation n=50 years
0.4% 1% 2%
Enthalpy/MCDB
Cooling DB/MCWB
MCWS/PCWD
to 99.6% DB
StdP
Humidification DP/MCDB and HR
Station name WMO#
Coldest
month
Heating DB99.6%
Lat
99%
2% 0.4%
Evaporation WB/MCDB
0.4% 2%1%
Dec
%
Jan
Feb Mar
Feb Mar
% Aug
Jun
Extreme
Max
WB
Hottest
month1%
Extreme Annual DB
Mean
Dehumidification DP/MCDB and HR
0.4% 1%
Extreme Annual WS
Hottest
month
DB range
n=5 years
JunMay
n=20 yearsn=10 years
Apr May
%
Jan
NovJul
Apr
Design conditions for QUANTICO MCAS, VA, USA
Aug Sep Oct Nov
Dec
%
Jul
Sep Oct
8/6/2019 425 1 Design Temps Lecture and HW
17/17