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1、Atwo-stagecuboid-styledthermoelectriccoolerwithswitchedpolarityX.C.Xuan',K.C.Ng',C.Yap',H.T.Chua2'MechanicalEngineeringDepartment,NationalUniversityofSingapore,10KentRidgeCrescent,Singapore119260,SingaporeEmail:mpexxco.nus.edu.sn(XiangchunXuan)'FacultyofEngineering,NationalUniversityofSingap
2、ore,10KentRidgeCrescent,Singapore117576AbstractDimensionsofthermoelements:area,A=1.96x10"mz,Thispaperintroducesatwo-stagecuboid-styledandlength,L=1.14x10"m,andgeometricfactor,thermoelectric(TE)cooler,whichissimplyformedbylinkingG=A/L=1.71xlO-'m;twosimilarsingle-stagecommercialTEmodulesserial
3、lyinthermalcascade.Superiortoaconventionaltwo-stageDimensionsofCeramicendplates:area,pyramid-styledTEcooler,thecuboid-styledcoolerhasAc=1.6x10.'mz,andthickness,1,=7.5xlo4m.switchedpolarity,whichmeansthatthecoolingrateandThermalconductivityk,ofceramicis35.3Wm-'K-l.coefficientofperformance(COP
4、)cankeepconstantwhenitssuppliedelectriccurrentsarealternated.Asanexample,a(a)single-stageTEmoduleofMELCORischosenforperformancecomparisonbetweensingleandtwo-stagecoolers.Practicalconditionsareaccountedforbyconsidering(b)',,,Itheeffectofthermalresistancebetweenstages.TheK.calculationsdemonstr
5、atethatthetwo-stagecuboid-styled(c)7M,zcoolercanattainhighertemperaturedifferencesthanthoseachievedbythesingle-stagemodule.BothCOPandcooling(d3:T,,fluxareimprovedatlargetemperaturedifference.Fig.1.Schematicofatwo-stagecuboid-styledTEcooler1.IntroductionAthermoelectric(TE)cooleremployselectro
6、nstoperformThefollowingassumptionsaremadeintheanalysis,coolingwithnomovingmechanicalparts.Itsdesigncanbea.TEpropertiesofn-andp-typethermoelementsaresimilarminimizedandintegratedaswellasorientationindependent.exceptthattheirSeebeckcoefficientshaveoppositeTherefore,ithasbeenwidelyusedinmanyfie
7、lds,suchaspolarity;military,aerospace,medicineetc.[1-51b.TEpropertiesofthermoelementsaredependentonOnerecentapplicationoftheconventionalTEcooleristotemperature,butwillbereferredtothevaluesataveragerotatethepolarityofsuppliedvoltagesuchthatthehotand
