自流对流与强制换热的热进联供的改进

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1、ARTICLEINPRESSRenewableEnergy32(2007)623–637www.elsevier.com/locate/reneneImprovedPV/TsolarcollectorswithheatextractionbyforcedornaturalaircirculationJ.K.Tonui,Y.TripanagnostopoulosDepartmentofPhysics,UniversityofPatras,Patra26504,GreeceReceived15September2005;ac

2、cepted3March2006Availableonline4May2006AbstractThephotovoltaic(PV)cellssufferefficiencydropastheiroperatingtemperatureincreasesespeciallyunderhighinsolationlevelsandcoolingisbeneficial.Air-cooling,eitherbyforcedornaturalflow,presentsanon-expensiveandsimplemethodofPVc

3、oolingandthesolarpreheatedaircouldbeutilizedinbuilt,industrialandagriculturalsectors.However,systemswithheatextractionbyaircirculationarelimitedintheirthermalperformanceduetothelowdensity,thesmallvolumetricheatcapacityandthesmallthermalconductivityofairandmeasures

4、forheattransferaugmentationisnecessary.Thispaperpresentstheuseofasuspendedthinflatmetallicsheetatthemiddleorfinsatthebackwallofanairductasheattransferaugmentationsinanair-cooledphotovoltaic/thermal(PV/T)solarcollectortoimproveitsoverallperformance.Thesteady-statethe

5、rmalefficienciesofthemodifiedsystemsarecomparedwiththoseoftypicalPV/Tairsystem.Dailytemperatureprofilesoftheoutletair,thePVrearsurfaceandchannelbackwallarepresentedconfirmingthecontributionofthemodificationsinincreasingsystemelectricalandthermaloutputs.Thesetechniquesa

6、reanticipatedtocontributetowardswiderapplicationsofPVsystemsduetotheincreasedoverallefficiency.r2006ElsevierLtd.Allrightsreserved.Keywords:PV/Tcollector;BIPV;Thermalenergy;Airheater;Performanceimprovement1.IntroductionThephotovoltaic(PV)moduleshavebeendeployedtopro

7、videelectricityinvarioustypesofbuildingsacrosstheworldandtherecentdevelopmentonphotovoltaic/thermalCorrespondingauthor.Tel./fax:+302610997472.E-mailaddress:yintrip@physics.upatras.gr(Y.Tripanagnostopoulos).0960-1481/$-seefrontmatterr2006ElsevierLtd.Allrightsreser

8、ved.doi:10.1016/j.renene.2006.03.006ARTICLEINPRESS624J.K.Tonui,Y.Tripanagnostopoulos/RenewableEnergy32(2007)623637Nomenclature2AaapertureareaofPVmodule(