Modeling heat and moisture transfer through.pdf

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1、InternationalJournalofHeatandMassTransfer45(2002)4045–4055www.elsevier.com/locate/ijhmtModelingheatandmoisturetransferthroughfibrousinsulationwithphasechangeandmobilecondensatesa,*bJintuFan,XinghuoWenaInstituteofTextilesandClothing,TheHongKongPolytechnicUniversity,HungHom,Kowloon,HongKo

2、ngbLabandEquipmentDivision,TsinghuaUniversity,Beijing100084,ChinaReceived6April2001;receivedinrevisedform10November2001AbstractThispaperreportsonatransientmodelofcoupledheatandmoisturetransferthroughfibrousinsulation,whichforthefirsttimetakesintoaccountofevaporationandmobilecondensates.T

3、hemodelsuccessfullyexplainedtheexper-imentalobservationsofFarnworth[Tex.Res.J.56(1986)653],andthenumericalresultsofthemodelwerefoundtobeingoodagreementwiththeexperimentalresultsofadryingtest.Basedonthismodel,numericalsimulationwascarriedouttobetterunderstandtheeffectofvariousmaterialand

4、environmentalparametersontheheatandmoisturetransfer.Itwasfoundthattheinitialwatercontentandthicknessofthefibrousinsulationtogetherwiththeenvironmentaltemperaturearethethreemostimportantfactorsinfluencingtheheatflux.Ó2002ElsevierScienceLtd.Allrightsreserved.Keywords:Heatandmoisturetransfer

5、;Waterevaporation;Numericalsimulation1.Introductiontomobilecondensate,andpresentedanapproximatesolutionbyneglectingthecondensationduringtheini-Condensationinfibrousinsulationisaseriousprob-tialtransientperiodandeffectsofcondensatemotiononleminclothingandmanyotherapplicationssuchasthetemp

6、eraturedistribution.Thistheoreticalmodelwasbuildinginsulationandrefrigeratedspaceenvelopes,aslaterextendedbyShapiroandMotakef[3]toanalyzetheitcanresultindrasticreductioninthermalinsulationofunsteadyheatandmoisturetransportprocessesthroughthesystem.thecalculationofquasi-steadyfieldsintim

7、e-varyingDespiteofthevastpublishedworkonheatanddomainsandcomparedtheanalyticalresultswithex-moisturetransferinfibrousinsulation,littlehasbeenperimentalonesundersomeverylimitedcircumstances.doneonthecoupledheatandmoisturetransferwithThisanalysiswasonlyappropriatewhenthetimescalephasech