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1、EnergyConversionandManagement51(2010)2698–2706ContentslistsavailableatScienceDirectEnergyConversionandManagementjournalhomepage:www.elsevier.com/locate/enconmanEffectofdooropeninganddefrostcycleonafreezerwithphasechangepanelsa,*abB.Gin,M.M.Farid,P.K.BansalaDepartme
2、ntofChemicalandMaterialsEngineering,TheUniversityofAuckland,20SymondsSt,Auckland1142,NewZealandbDepartmentofMechanicalEngineering,TheUniversityofAuckland,20SymondsSt,Auckland1142,NewZealandarticleinfoabstractArticlehistory:Aninvestigationintotheeffectivenessofphase
3、changematerial(PCM)panelsplacedagainsttheinternalReceived20September2009wallsofafreezertomaintainstabletemperaturesinthepresenceofheatloadssuchasdooropenings,Accepted1June2010defrosting,andlossofelectricalpowerwascarriedout.TemperatureresponsewasstudiedduringlossAv
4、ailableonline22June2010ofpower,adefrostcyclelasting30min,andadooropeningschemeof13dooropeningsoveran11hperiod.ThisPCMsystemhassignificantlydecreasedtherateoftemperatureincreaseinsidethefreezerKeywords:duringdefrostingandpowerloss.Energyconsumptionwasmeasuredduringst
5、eadyoperation,adefrostPhasechangematerialcycleof30min,andaschemeofeightdooropeningsat40minintervals.ItwasfoundthatheatloadsFreezercausedgreaterenergyconsumption,andthatthepresenceofPCMduringdefrostinganddooropeningsEnergyconsumptionDooropeningresultedinslightlylowe
6、renergyconsumptioncomparedtowithoutPCM.DefrostÓ2010ElsevierLtd.Allrightsreserved.Powerloss1.IntroductionLossofpowertotherefrigerationsystemmayalsooccur,andheatloadsthatcomethroughthewallscannolongerberemoved.ControlledtemperatureenvironmentscanbeimportantduringThis
7、canhappeninrefrigeratedtrucksiftherefrigerationsystemisthestorageandtransportationofmanyperishablesincludingfoodsturnedofftoconservefuel,orforcoldstoresanddomesticfreezersandpharmaceuticals.Manyperishablesneedtobekeptatlowinlessdevelopednationswherepowermaybecutoff
8、forloadtemperaturesandalsowithinstricttemperaturebands.Fluctua-sheddingpurposes.Manyoftheseheatloadsareunavoidabletionsintemperaturecanadverselya
