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1、Ventilation(architecture)Anairhandlingunitisusedfortheheatingandcoolingofairinacentrallocation(clickonimageforlegend).Ventilating(theVinHVAC)istheprocessof"changing"orreplacingairinanyspacetoprovidehighindoorairquality(i.e.tocontroltemperature,replenishoxygen,orrem
2、ovemoisture,odors,smoke,heat,dust,airbornebacteria,andcarbondioxide).Ventilationisusedtoremoveunpleasantsmellsandexcessivemoisture,introduceoutsideair,tokeepinteriorbuildingaircirculating,andtopreventstagnationoftheinteriorair.Ventilationincludesboththeexchangeofai
3、rtotheoutsideaswellascirculationofairwithinthebuilding.Itisoneofthemostimportantfactorsformaintainingacceptableindoorairqualityinbuildings.Methodsforventilatingabuildingmaybedividedintomechanical/forcedandnaturaltypes.[1]"Mechanical"or"forced"ventilationisusedtocon
4、trolindoorairquality.Excesshumidity,odors,andcontaminantscanoftenbecontrolledviadilutionorreplacementwithoutsideair.However,inhumidclimatesmuchenergyisrequiredtoremoveexcessmoisturefromventilationair.Kitchensandbathroomstypicallyhavemechanicalexhausttocontrolodorsa
5、ndsometimeshumidity.Kitchenshaveadditionalproblemstodealwithsuchassmokeandgrease(seekitchenventilation).Factorsinthedesignofsuchsystemsincludetheflowrate(whichisafunctionofthefanspeedandexhaustventsize)andnoiselevel.Ifductingforthefanstraverseunheatedspace(e.g.,ana
6、ttic),theductingshouldbeinsulatedaswelltopreventcondensationontheducting.Directdrivefansareavailableformanyapplications,andcanreducemaintenanceneeds.Ceilingfansandtable/floorfanscirculateairwithinaroomforthepurposeofreducingtheperceivedtemperaturebecauseofevaporati
7、onofperspirationontheskinoftheoccupants.Becausehotairrises,ceilingfansmaybeusedtokeeparoomwarmerinthewinterbycirculatingthewarmstratifiedairfromtheceilingtothefloor.Ceilingfansdonotprovideventilationasdefinedastheintroductionofoutsideair.Naturalventilationisthevent
8、ilationofabuildingwithoutsideairwithouttheuseofafanorothermechanicalsystem.Itcanbeachievedwithopenablewindowsortrickleventswhenthespacestoventila
