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1、RelatedCommercialResourcesCHAPTER44BUILDINGAIRINTAKEANDEXHAUSTDESIGNExhaustStackandAirIntakeDesignStrategies...........................................................................44.1GeometricMethodforEstimatingStackHeight.......................................
2、....................................44.5Exhaust-To-IntakeDilutionCalculations.....................................................................................44.6FRESHairentersabuildingthroughitsairintake.Likewise,Fig.1FlowRecirculationRegionsandParametersbuild
3、ingexhaustsremoveaircontaminantsfromabuildingsowindcandilutetheemissions.Iftheintakeorexhaustsystemisnotwelldesigned,contaminantsfromnearbyoutsidesources(e.g.,vehicleexhaust)orfromthebuildingitself(e.g.,laboratoryfumehoodexhaust)canenterthebuildingwithinsufficientd
4、ilution.Poorlydilutedcontaminantsmaycauseodors,healthimpacts,andreducedindoorairquality.Thischapterdiscussesproperdesignofexhauststacksandplacementofairintakestoavoidadverseairqualityimpacts.Chapter16ofthe2005ASHRAEHandbook—Fun-damentalsmorefullydescribeswindandair
5、flowpatternsaroundbuildings.RelatedinformationcanalsobefoundinChapters7,15,30,31,and32ofthisvolume,Chapters12and13ofthe2005ASHRAEHandbook—Fundamentals,andChapters24,25,and30ofthe2004ASHRAEHandbook—HVACSystemsandEquipment.Fig.1FlowRecirculationRegionsandExhaustParam
6、eters(Wilson1982)EXHAUSTSTACKANDAIRINTAKEdistancefromthestack.Petersenetal.(1999)foundthatexhaustDESIGNSTRATEGIESdispersionimproveswithincreasedscreenporosity.StackDesignStrategiesLargebuildings,structures,andterrainclosetotheemittingbuild-ingcanadverselyaffectstac
7、kexhaustdilution,becausetheemittingThedilutionastackexhaustcanprovideislimitedbythedisper-buildingcanbewithintherecirculationflowzonesdownwindofsioncapabilityoftheatmosphere.Beforedischarge,exhaustcon-thesenearbyflowobstacles(Wilsonetal.1998a).Inaddition,anairtamin
8、ationshouldbereducedbyfilters,collectors,andscrubbers.intakelocatedonanearbytallerbuildingcanbecontaminatedbyCentralexhauststhatcombineflowsfromm
