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1、SaelensD.,CarmelietJ.,andHensH.,2003,EnergyPerformanceAssessmentofMultipleSkinFacades,InternationalJournalofHVAC&RResearch.,vol.9,nr.2,pp.167-186.EnergyPerformanceAssessmentofMultipleSkinFacadesDirkSaelens,Ph.D.JanCarmeliet,Ph.D.HugoHens,Ph.D.MemberASHRAEABSTRACTInthispaper,theenergyperf
2、ormanceofanofficerespectivelyequippedwithaconventionalinsulatedglazingunitwithexteriorshadingandwiththreemultipleskinfacadetypologies(anairflowwindow,asupplyairwindowandanaturallyventilatedwindow)ismodelledanddiscussedundertypicalBelgianweatherconditions.Itisfoundthatmultipleskinfacadesm
3、ayimprovetheenergyefficiency.However,theanalysisshowsthatvariantsperformingwellinwinterarenotnecessarilybeneficialinsummer.Combiningtypologiesorchangingthesystemssettingsaccordingtotheparticularsituationwillbenecessarytoobtainanoverallallyearroundimprovement.Theresultsfurtherindicatethat
4、evaluatingtheenergyefficiencyofmultipleskinfacadescannotbeperformedbyanalysingthetransmissionlossesandgainssolely.Itisimperativetotakeintoaccounttheenthalpychangeofthecavityairandtoperformawholebuildingenergyanalysis.1.INTRODUCTIONThesensibilityforenvironmentalfriendlyandenergyconsciousb
5、uildingdesignurgedtheneedtodevelopnewfacadetechnologies.Inthesearchtowardsenergyefficientandvisuallyattractivefacades,multipleskinfacades(MSFs)areregularlypresentedasbeingvaluablesolutionstofollowthedesiresofmodernarchitecture.MSFs(alsoknownasactiveenvelopes,secondskinfacades,twin-facade
6、s,etc.)consistoftwopaneswithinbetweenacavitythroughwhichairflows.Thedrivingforcefortheairflowisnaturalormechanicalventilation.Inthecavity,usuallyashadingdeviceisprovided.Generally,distinctionismadebetweennaturallyandmechanicallyventilatedMSFs.ExtensiveliteratureonMSF-typologiescan,forexa
7、mplebefoundinCompagno[1995],Gertis[1999],Ziller[1999],Bakeretal[2000],Oesterleetal[2001]andAronsandGlicksman[2001].Inliterature,numerouspapersdescribehowMSFsshouldworktoimprovethebuilding’senergyefficiency.Asmanyvariantsexist,theprinciplestoreducetheenergydemandstronglyde
