Price Ufad

7/29/2019 Price Ufad

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www.price-hvac.com/green

UNDERFLOOR & DISPLACEMENT VENTILATIONA Product Guide for Sustainable Design

PRICE WORKS HARD TO PROMOTE THE USE OF SUSTAINABLE BUILDING

materials and innovative air distribution technologies to improve the air quality

and environment integrity of buildings. Price has a long history of designing

and promoting products that are energy efficient and ideal for Green Buildingdesigns. Price is committed to the continual introduction of new products and

systems that further the goals outlined by the USGBC.


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GREEN INITIATIVES

Price has been a member of the United States Green Building Council

(USGBC) for almost three years. This membership allows us to com-

ment on new green building programs, such as the LEED program,

and take an active role in the maintenance of such programs.

Price is committed to sustainable design and has made efforts to

design products and employee manufacturing techniques thatpromote these ideals. This support is obvious in the development

of products for Displacement Ventilation, Underfloor Air Distribution,

Personal Control (Prodigy, Varitherm) and Fan Terminals with ECM

Motors, but also in the way that Price conducts business everyday.

Some of the efforts E.H. Price has recently made to reduce

environmental impact of the manufacturing processes are:

Our high tech paint line allows us to consistently paint product

with a durable finish, free of volatile organic compounds

(VOCs), while producing nearly zero waste. The powder that

does not make it onto a product is collected and used for the

next batch.Increasing the speed of the paint line has allowed us to turn

off the ovens for hours at a time. Price has begun converting

the cooling of our spot welders from a continuous flow of

potable city water to dedicated chillers; a big win for water

efficiency.

We are installing T5 lighting in our new building, which is

expected to reduce lighting energy consumption by 30%.

Price has recently been involved in two green events. First, Price

had a booth at the USGBCs annual conference, Greenbuild.

Price is well on its way to becoming the leading manufacturer

of air distribution equipment in the green market. We were the onlymanufacturer of displacement ventilation products to have a booth

at the show. This product line was a shining star at Greenbuild,

boosted by several technical sessions discussing the merits of

displacement ventilation systems, one speaker even mentioned

how happy he is with the Price displacement outlets he specified

and were installed last year.

Look for more information on Prices Green Journey and be sure to

stop by our booth at next years conference in Denver, November

15 - 17, 2006.

Second, in mid November, Price held a Sustainable Building

Seminar in Las Vegas, NV which focused on DisplacementVentilation and Underfloor Air Distribution. This event was tailored

to the local market and much of the discussion focused on how

these technologies relate to the markets for casinos and large

public spaces such as theaters, libraries and lobbies. This event

The Edgewater Casino in Vancouver, BC Canada

DF1Rs are installed along the wall near the gaming tables on the upper level

Radio Shack Headquarters in Fort Worth, Texas USA

was a great success with an attendance of over 90 engineers,

architects, mechanical reps and contractors from California and

Nevada to Michigan and New Jersey. Attendees learned about the

advantages of DV and UFAD, with emphasis on the local building

issues. As such, a lot of time was spent on the Indoor AirQuality advantages offered by DV and UFAD systems. DV and

UFAD are the perfect air distribution solutions to buildings that per-

mit smoking or have other IAQ considerations due to the general

upward air flow.


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AIR DISTRIBUTION TECHNOLOGIES

ENERGY AND ATMOSPHEREEnergy PerformanceUFAD

UFAD provides many opportunities for reducing the energy

consumption typical of a traditional overhead air delivery system.

Due to the air outlets being at floor level, the mixing zone usuallyonly extends from the floor to approximately 6ft above the floor.

ASHRAE standard 55 limits the combination of air velocity and

temperature according to Figure 4. Additionally, when an underfloor

plenum is used, conduction through the floor causes the floor

surface temperature to be slightly warmer than the supply air

temperature. As a result, the typical cooling supply air temper-

atures should be approximately 10oF higher than with overhead

mixing flows in order to maintain comfort conditions and ensure

that the floor is not so cold as to cause discomfort. The decreased

mixing zone, (Figure 1), dramatically reduces the cooling air

capacity required to satisfy the cooling load as the warm-est air has naturally risen to the ceiling level and remains

there, outside of the mixed zone. The lesser cooling requirements

and higher supply air temperatures often lead to similar

supply air volumes as in overhead air distribution. The total room

loads have not changed, and therefore, due to the higher supply

air temperature and stratification above the mixing zone, the

return air temperature of a UFAD system is substantially higher

than for a mixed system. The increased return air temperature and

supply air temperature contribute to an increased chiller COP,

providing energy savings.

Higher supply temperatures extend the free cooling band, the hours

in the day where the ventilation system can use outdoor air to coolthe building; in some climates (where humidity is less of an issue)

this leads to increased use of the economizer, an excellent way to

reduce energy consumption. Further energy savings are realized with

the reduced air pressure required for the system. UFAD installations

typically work at a plenum pressure of < .1" wg, reducing duct static

pressure and the fan requirements for the system. Reducing the fan

requirements usually means that smaller equipment can be

sized. A secondary benefit is a reduction in the cost of the HVAC

equipment.

Displacement Ventilation

Displacement Ventilation affords many of the energy savingsof UFAD. Due to the diffusers being at floor level and their low

velocity and low induction supply, the mixing zone is virtually

eliminated. With little or no entrainment of room air, the supply air

flows along the floor until it is caught in a thermal plume from a

person, machinery or other heat source, delivering air only to the

areas that require it (Figure 2), dramatically reducing the cooling

load.

As there is limited entrainment of room air, the temperatures at

the floor level are often very near supply air temperature. Thermal

comfort criteria stipulate that the supply air temperature be

similar to those of UFAD, leading to the same types of energy savingsdue to equipment size and efficiencies. Displacement diffusers

generally have low face velocities and very low static pressure

losses. Further energy savings can be realized by lower duct

static pressures as discussed in the UFAD section.

As with a UFAD system, there is an increased opportunity for free

cooling and use of an economizer due to the higher supply

temperatures. These provide an excellent opportunity for energy

savings because the ventilation air can be used for conditioning the

space directly, so long as the relative humidity of the outdoor air is

acceptable. Many displacement ventilation systems are using

auxiliary cooling to manage the majority of the cooling load in theoccupied zone; this allows the displacement system to supply

enough air to meet the ventilation requirements only. These

much lower supply air volumes can lead to significant reduction in

energy consumption on the air side of the mechanical system.

FIGURE 2 Displacement Ventilation

FIGURE 1 Typical UFAD Room Air Dynamics


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FIGURE 3 RFTDA & RFID

AIRVELOCITY,m/s

TEMPERATURE DIFFERENCE, K

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

AIRVELOCITY,

m/s

TEMPERATURE DIFFERENCE, K

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

ECM Motors

Electrically Commutated Motors have a minimum efficiency of 70%

throughout their entire operating range. Conventional induction

motors become less efficient at the reduced speeds that are

typically selected for fan-powered applications. Energy savings of

50 - 60% can be achieved with the ECM motor at normal operating

conditions. The ECM motor life is extended due to its low

operating temperature and ball bearing design.

Price Industries offers ECM motors on all fan-powered terminals

for overhead and underfloor systems.

Control of Systems

UFAD

Price offers many options for local air delivery control. The Price

RFTDA and RFID allow occupants to adjust the flow out of each

outlet in the interior zone or direction of primary jet, respectively.

These units are typically installed at each workstation, allowing

employees to individually control the supply air to their space.

Overhead Air Distribution

The Price Prodigy personal VAV diffuser allows personal control of

a zone by use of an optional thermostat or infrared remote control.

These diffusers are an ideal solution to providing personal control

in an office environment.

Thermal ComfortUFAD

Underfloor air distribution swirl diffusers are designed to have highinduction rates with short penetration into the room. They also tend

to cause little disturbance of the surrounding air, allowing them to

be located in the work area. The mixing that occurs in the occupied

zone causes consistent temperature throughout the occupied zone

and a thermally comfortable environment.

FIGURE 4 Percentage of Occupants Objecting to Draft in Air-Conditioned Rooms


Due to the fact that air is introduced at low velocity and at floor

level, there is minimal entrainment of room air. Displacement

diffusers are designed to introduce air at a higher temperature than

typical air distribution systems. This is in consideration of ASHRAE

55 which limits the combination of temperatures and velocities

which can occur in the occupied zone according to Figure 4.

The intent of introducing the supply air at low velocities and levels

in the space is to stratify the zone. Another stipulation in ASHRAE

55 is that the maximum temperature gradient allowed from ankleto head level is 5oF (3oC); the ideal temperature gradient in the

occupied zone is approximately 4oF (2oC). Care must be taken

when designing these types of systems not to over-stratify the

zone by underestimating the cooling load or to sub cool the space

by overestimating the load.



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Temperature, Contamination, Croom

0

2

3.55

6.5

8Croom

TroomTplane1

Tplane2

Heightabovef

loor,z(m)

INDOOR ENVIRONMENTAL QUALITYUFAD

Generally, underfloor air distribution mixes the occupied zone, while

having sufficiently low penetration levels to cause a stratification

layer above it. This promotes a general upward movement of air as

warm, contaminated air is removed from the stratified zone, being

replaced by fresh supply air from below.


Displacement ventilation presents an opportunity to improve both

the thermal comfort and indoor air quality (IAQ) of the occupied

space. Displacement ventilation takes advantage of the difference

in air density between an upper contaminated zone and a lower

clean zone as illustrated in Figure 5. Cool air is supplied at low

velocity into the lower zone. Convection from heat sources creates

vertical air motion into the upper zone where high level return

outlets extract the air. In most cases these convection heat sources

are also the contamination sources, (people or equipment) thereby

carrying the contaminants into the upper zone, away from the

occupants (Figure 2).

Increased Ventilation Effectiveness

According to ASHRAE Standard 62, Addendum n, Appendix E,

Displacement Ventilation and UFAD both provide a ventilation

effectiveness which exceeds that of OHAD.

ASHRAE 62.1 requires that the ventilation airflow be divided by the

ventilation effectiveness. Displacement ventilation and underfloor

air distribution have typical ventilation effectivenesses ranging

from 1.2 to 4 in cooling mode. This can cause a dramatic reduc-

tion in the outdoor air requirement and significant energy savings

through reduced conditioning load.FIGURE 5 Typical Contamination Concentration in an Environment that employs


The Center for the Built Environment

Price is pleased to announce its support of and participation in the Center for the

Built Environment. The Center for the Built Environment (CBE) is a consortium of

industry partners including consulting firms, manufacturers, utilities, the Univer-

sity of California, Berkeley and governmental regulatory bodies. It is a dynamic,

collaborative place where people can share ideas for improving the design and

operation of commercial buildings. Based in Berkeley, California, the CBE is in the

San Francisco Bay area, a hotbed of innovative building design.

The CBE is dedicated to furthering our understanding of thermal comfort and

innovative design technologies in buildings of all types. These include advanced

metrics for human occupancy satisfaction as well as years of research in Underfloor

Air Distribution.



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Product

DF1/DF3 Rectangular

Displacement Diffuser

DF1W Rectangular 1-WayIn-Wall Displacement

Diffuser

DF1R 1-Way Diffuser forRecessed Applications

DF1C Rectangular 1-WayCorner Displacement

Diffuser

DR360 Full Round

Displacement Diffuser

DR180 Half RoundDisplacement Diffuser

DR180U Round 180Displacement Diffuser

DR90 Round 90 Displacement

Diffuser

DLE/DLE-H Displacement LinearEnclosure

Description

Flat face diffuser supported by a rigid aluminum frame

Easily installs against structural columns

Wall mounted displacement diffuser

Provided with engineered plenum

Fits into standard wall stud spacing

Architecturally pleasing & discreetly designed

Low air mixing is coupled with low noise levels

Flat faced diffuser creates appealing 45 corner detail

Nests within corner, ideal for office applications

Low turbulence flow with low velocities

Available in Duct Hanging (DH) configurations

Low turbulence flow with low velocities

Typically placed against a wall or other flat surface

High capacity half round diffuser

High air volumes with minimized induction

Round face corner displacement outlet

Ideal for office and classroom applications

Architecturally appealing perimeter diffuser

Can be supplied with integrated auxiliary heat

Image

DisplacementVentilation

PRODUCT LIST


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ImageProduct

RFTD/ Round Floor RFTDA Turbulant Diffuser

RFID Round Floor InclinedDiffuser

ARFHD Aluminum Round FloorHorizontal Flow Diffuser

DBV Round Floor Variable AirVolume Basket

RPN Relative Pressure Node

RFB Round Floor Boot

LFG Linear Floor Grille

UMC Underfloor ModulatingController

UMCB

Underfloor ModulatingController - Box Control

FDBU Underfloor Fan Powered

Terminal Unit

FDCU

Underfloor Fan Powered

Terminal Unit

Underfloor

PRODUCT LIST

Description

High induction, short throw diffuser promotes stratification

Face adjustable supply air volume (RFTDA only)

Inclined jet allows control of supply air direction

High induction, short throw diffuser

Displacement floor outlet

Horizontal air pattern minimizes induction

VAV control of round floor diffusers

Plug and play connector to Price UFAD controllers

Monitors room pressure

Hides under standard floor diffusers to keep

consistant look

Controls air volume through floor diffusers

Available in CAV Heating and VAV Cooling as well

as CAV models

Well suited for perimeter applications

Allows for the supply and control of warm and cold

supply air from raised floor systems

Cooling only VAV controller

Controls up to 14 RFBs/LFGs/DBVs

Advanced control of UFAD terminals

BACnet compliant UFAD controller

Clean and efficient design

Low noise generation for quiet operation

Low noise generation for quiet operation

Compact configuration makes for easy install


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A I R D I S T R I B U T I O N P R O D U C T S F O R W O R L D - C L A S S C I T I E S

2975 Shawnee Ridge Court

Suwanee, Georgia USA 30024

Ph: 770.623.8050 Fax: 770.623.6404

I N T H E U N I T E D S T A T E S

US Head Office, Laboratory & Testing

Facilities, Manufacturing Facilities &

Distribution Warehouse in Atlanta, Georgia

Representation in major US cities

Manufacturing Facilities & Distribution

Warehouse in Phoenix, Arizona

Representation in major US cities

Head Office, Export Sales Office,

Laboratory & Testing Facilities,

Manufacturing Facilities & Distribution

Warehouse in Winnipeg, Manitoba

Sales Offices or Representation in all

major Canadian cities

638 Raleigh Street

Winnipeg, Manitoba Canada R2K 3Z9

Ph: 204.669.4220 Fax: 204.663.2715

999 North Thornton Road

Casa Grande, Arizona USA 85222-3809

Ph: 520.423.0515 Fax: 520.423.0517

I N T H E U N I T E D S T A T E S

I N C A N A D A

Product Improvement is a continuing endeavour at Price. Therefore, specifications are subject to change without notice. Consult your Price sales representative

for current specifications or more detailed information.

Price is a registered trademark of E.H. Price Limited. 2006.

Lithographed in Canada 2006

The founding principles of our company have never changed - business integrity, first-class service and a commitment to people. Price manufacturing endeavoursarose from our belief that we could supply superior products and services at a reasonable price. Our mission is to become the worldwide supplier of

preference for air distribution products and services. You can rely on Price our products and services with confidence.

w w w . p r i c e - h v a c . c o m

Displacement VentilationTerminal Units Underfloor Products Security ProductsGrilles, Registers & Diffusers

Warranty: The Company warrants and guarantees that all goods within this brochure that have been manufactured by the Company have been manufactured in accordance with

the spec ifications published herein an d will be free from defe cts in material and work manship for a period o f twelve (12) mon ths from the Bill of Ladin g issued by the Company. T he

Company will replace defective product at its option, but will not be responsible for labor or material charges in replacing product or consequential damages. Any installation not

conforming with the Companys specifications, manuals, bulletin s or instructions or any misuse or any modification not authorized by the Company voids this warranty. This warranty

is in lieu of all Provincial, State, and Federal statutory warranties and the conditions herein are in substitution and replacement of which warranties, statutory or otherwise.

Y O U R L O C A L P R I C E R E P R E S E N T A T I V E :

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