Industrial Ventilation Systems

8/10/2019 Industrial Ventilation Systems

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Thiscourseisadaptedfromt

heUnifiedFacilitiesCriteriao

ftheUnitedStatesgovernment,

whichisinthepublicdomain,

hasunlimiteddistributionandisnotcopyrighted.

J.

PaulGuyer2009

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CONTENTS

1.INTRODUCTION

1.1GENERALCRITE

RIA

1.2DESIGNPROCED

URE

1.3DESIGNCRITERIA

1.4CONTROLS

1.5OPERATIONALC

ONSIDERATIONS

1.6COMMISSIONING

2.WOODSHOPFAC

ILITIES

2.1FUNCTION

2.2OPERATIONALC

ONSIDERATIONS

2.3FLOORPLANLAYOUT

2.4DESIGNCRITERIA

2.5SAFETYANDHE

ALTHCONSIDERATIONS

3.PAINTSPRAYBO

OTHS

3.1FUNCTION

3.2OPERATIONALC

ONSIDERATIONS

3.3DESIGNCRITERIA

3.4FANSANDMOTO

RS

3.5REPLACEMENTAIR

3.6SYSTEMCONTR

OLS

3.7RESPIRATORYP

ROTECTION

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2009

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runn

ing,

istheoffsetstackdesignC,asshow

ninFigure1-1.

Watermaystill

ente

rthesystemwithstraightstackdesignA.P

rovideameanstodrainwater

from

thefanhousing.

Loc

ationandStructuralConsiderations.

RefertoASHRAE(AmericanSociety

ofH

eating,

RefrigerationandAirConditioningE

ngineers)Handbook,

Fun

damentalsforinformationonairflowaround

buildings.

Donotselectstack

loca

tionsbasedonprevailingwinds.Astackm

ustprovideeffluentdispersion

underallwindconditions.RefertoUFC1-200-01,

Design:GeneralRequirements

fore

xhauststackstructuraldesignconsideratio

ns.

Somestructural

considerationsarewindload,

lightningprotection,andstacksupport.

Referto

and

SMACNAGSSDC,

GuideforSteelStackD

esignandConstructionfor

additionalinformation.

1.3.3AirP

ollutionControlEquipment.Requirementsforairpollutionequipmentvary

byprocess

andgeographicalregionintheUnitedStates.Contactthelocal

environmentalmanagertodeterminethepollutioncon

trolrequirementsfortheprocess.

1.3.4ReplacementAir.

Replacementairisasimportantasexhaustairincontrolling

industrialp

rocesscontaminants.

Properlydesignedre

placementairwill(1)ensurethat

exhaustho

odshaveenoughairtooperateproperly,(2)helptoeliminatecross-drafts

throughwindowanddoors,

(3)ensureproperoperatio

nofnaturaldraftstacks,

(4)

eliminatec

olddraftsonworkers,and(5)eliminateexc

essivedifferentialpressureon

doorsand

adjoiningspaces.Themethodofdistributin

greplacementairandthequantity

ofreplacem

entairarecriticalwithrespecttoexhaustair.

Designthereplacementair

systeminaccordancewiththedecisiontreeshownin

Figure1-2.

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yer2009

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ExhaustStackDesigns

Figure1-1

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DecisionTreeforReplacemen

tAirDesign

Figure1-2

1.3.3.1SpacePressureModulation.

Controltheven

tilatedspacepressureby

modulating

thequantityofreplacementair.

Useavariablefrequencydrive(VFD)motor

tocontrolthefanspeed.

Usingbarometricdamperstocontrolreplacementairquantity

isinefficien

tandunreliable.

Sensorcontrolledtransfergrillesareacceptableprovided

therewilln

otbeaproblemwithcontaminatedmigratio

n.

1.3.3.2Ple

numDesign.

Useperforatedplatetocove

rasmuchoftheceiling(orwall

oppositeth

eexhausthood(s))aspractical.Thediame

teroftheperforationshouldbe

between1/4inand3/8in.

Perforatedplenumsworkb

estwhenceilingheightisless

than15ft.

Useeitherofthefollowingtwochoicesforreplacementairplenumdesign:

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Designfor1,00

0fpmreplacementairvelocitythroughthe

openareaofthe

perforatedplateifperforatedductisusedinsidetheplenu

masshowninFigure

1-3.

PlenumDesignwithPerforatedDuct

Figure1-3

Designfor2,00

0fpmreplacementairvelocitythroughthe

openareaofthe

perforatedplateiftheplenumisservedwithductsusingd

iffusers,grillsor

registersasshowninFigure1-4.

PlenumDesignwithoutPerforatedDuct

Figure1-4

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NOTES:

1.

Sizeeac

hplenumtake-offfornomorethan8ftofple

numwidth.

Sizetheexhaust

plenumfor

amaximumplenumvelocityof1,0

00fpm.Sizereplacementairplenumfora

maximump

lenumvelocityof500fpm.

2.

Perforatedplatewith3/8-inholes.

Sizeopenareafor

anairflowvelocityof2,0

00fpm

throughholes.

Drive-throughcrossdraftpaintboothwithm

echanicalreplacementair.

Figure3-2

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NOTES:

1.

Sizeeachplenumtake-offfornomorethan8ftofplenumwidth.

Sizetheexhaust

plenumforamaximumplenumvelocityof1,0

00fpm.

Sizereplac

ementairplenumfora

maximumplenumvelocityof500fpm.

2.

Perforatedplatewith3/8-inholes.

Sizeopenareaforanairflowvelocityof2,0

00fpm

throughholes.

Drive-through

crossdraftpaintboothwithnoMechanica

lreplacementair

Figure3-3

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3.5.2HeatingandAirConditioning.

Mostnewpain

tsprayboothventilationsystems

haveapaintingmodeandacuringmode.

Donotre-circulateairduringthepainting

mode.

Abo

ut10percentoftheboothairflowisfromoutsidetheboothand90percentof

theexhaus

tairisrecycledduringcuring.

Reviewthep

aintdryingrequirementsbefore

specifying

temperatureandhumidityranges.Referto

ANSIZ9.7

forexhaustairre-

circulation

requirements.

3.6SYSTE

MCONTROLS.

Designsystemcontrolsina

ccordancewithparagraph1.4.

3.7RESPIRATORYPROTECTION.

Seeparagraph1.5

.6.

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yer2009

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Industrial Ventilation Systems

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