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1、4531ReprintedfromtheInternationalJournalofHeating,Ventilating,Air-ConditioningandRefrigeratingResearch.NumericalStudyofConvectiveandRadiativeHeatTransferfromaWindowGlazingwithaVenetianBlindJ.Phillips,M.E.Sc.,P.Eng.D.Naylor,Ph.D.,P.Eng.MemberASHRAEP.H.Oosthuizen,
2、Ph.D.,P.Eng.S.J.Harrison,Ph.D.,P.Eng.MemberASHRAEAtwo-dimensionalnumericalsolutionhasbeenobtainedoftheeffectofavenetianblindontheconjugateheattransferatanindoorwindowglazing.Asolutionhasbeenobtainedtothecou-pledlaminarfreeconvectionandradiationheattransferproble
3、m,includingconductionalongtheblindslats.ThelocalconvectiveNusseltnumberdistributionswerefoundtocomparewellwithpublishedexperimentaldataforanaluminumblind.Also,therewasgoodqualitativeagreementwithtemperatureandflowfieldvisualizationphotographs.Theresultsshowthat,
4、overawiderangeofRayleighnumbers,analuminumvenetianblindcanhaveastrongeffectontheheattransferratefromtheindoorwindowglazing.Dependinguponthespecificconditions,theaverageconvectiveheattransferratecaneitherincreaseordecrease.However,forallcasesstudied,theblindwasfo
5、undtosubstantiallyreducetheradiativeheattransferratefromthewindow,evenwhentheslatswerefullyopen.INTRODUCTIONWindowshadingdevicesareusedinbuildingsprimarilytoprovideanaestheticallypleasingmeansofcontrollinglightingconditionsandoccupantprivacy.Inadditiontotheseint
6、endedfunctions,ashadealsoaffectsthethermalperformanceofafenestration.Shadingdevices,suchasvenetianblinds,affectthefreeconvectiveandradiativeheattransferratesattheindoorglaz-ingsurfaceandcanhaveasubstantialinfluenceontheoverallheattransferratethroughthefen-estrat
7、ion.Atpresent,thecomplexthermalinteractionbetweenavenetianblindandanadjacentwindowisnotwellunderstood.Anumericalsolutionispresentedofthisinteractionforsummernighttimeconditions(i.e.,fornoheatingoftheblindbysolarradiation).Apreviousstudythatiscloselyrelatedtothec
8、urrentworkhasbeendonebyMachinetal.(1998).Inthatexperimentalstudy,analuminumvenetianblindwasplacednexttoaheatedisothermalaluminumplate,whichapproximatedthecenter-of-gl
