汽车空调层叠式与管带式蒸发器性能模拟分析比较Ξ

X(),,,,15%,50%,,Theperformencesimulationcomparisonoftheautomotivelaminatedandtheband2tubeevaporatorHaoLiangKanJieLiTaoLiQiangYuanXiuling(XianJiaotongUniversity)ABSTRACTTheheattransferandpressuredropcharacteristicsoftheautomotiveair2condi2tionlaminatedevaporatoriscomparedwiththeband2tubeevaporatorusingnumericalsimulationmethodunderA/Ccondition.Theresultshowsthatthecapacityofthelaminatedevaporatorislargerthantheband2tubeevaporatorby15%,whilethepressuredropislowerby50%.Andbecauseofthecompactstructurecharacteristicofthelaminatedevaporator,theperformanceofthelaminatedevaporatorisbetterwhentherefrigerantfluxislarger.KEYWORDSlaminatedevaporator;band2tubeevaporator;heattransfer;pressuredrop,,,,,,,,,,,,,,1,,,(1),,7120072REFRIGERATIONANDAIR-CONDITIONING61265X:2005210210:,Email:[e-mail],U,180,,,,,,,122.1,,:;,;;,;,2.2,,23,,42,:34:9(u)9z=0u9u9z=-9P9z-fu9h9z=CiAiq,q=i(Tw-Tr):madhadydy=oAoCpa(ha-hs)madadydy=Ao(wa-ws)(kg/m3);u(m/s);h(kJ/kg);(W/(m2K));(g/kg);P(Pa);z(m);Cp(kJ/(kgK));m(kg/s);f(Pa/m);y(m);,:a;r;i;o;in;out,180,,,,,,2.3R134a,REF2PROPFORTRAN2672.4,,,,20%30%,80%,,,,,Lockhart2Martinelli[1],YangWebb[2];Dittus2Boelter,Blasius[3]U,,,[4],Kandlikar[5],Dittus2Boelter,[6][7],Blasius[2],,Davenportjf[2],,,[8]3,0.2m,0.24m,65mm;,8.0mm2.8mm5,,3.1565,,,,,,,,15%,50%,563.278,,,,,,,,,,361:,783.3,910,39,16%;,50%,,11,,,,,,12,2.08%1.36%,,,,912,,91011124674,,,,15%,50%,,,,[1]FeldmanaA,MarvilletbC,LeboucheM.NucleateandConvectiveBoilinginPlateFinHeatExchangers.Int.J.HeatandMassTransfer,2000(43):343323442.[2],..:,2003.[3]OuldDidiMB,KattanN,ThomeJR.Predictionoftwo2phasepressuregradientsofrefrigerantsinhorizontaltubes.Int.J.Refrigeration,2002(25):9352947.[4]HanJC,ChandraPR,LauSC.Localheat/masstransferdistributionsaroundsharpl802degturnsintwo2passsmoothandrib2roughenedchannels.JournalofHeatTransfer,1988,(110):9128.[5]KandlikarSG.AGeneralCorrelationforSaturatedTwo2PhaseFlowBoilingHeatTransferInsideHorizon2talandVerticalTubes.JournalofHeatTransfer,1992,(112):2192228.[6]GarciaValladaresO.ReviewofIn2TubeCondensationHeatTransferCorrelationsforSmoothandMicro2finTubes.HeatTransferEngineering.2003,(24):6224.[7]CavallliniA,DelColD,DorettiL,etal.HeatTransferandPressureDropDuringCondensationofRefrigerantInsideHorizontalEnhancedTubes.IntJRefrigeration,2000,(23):4225.[8],..:,2000.(55)0.004(m2K)/W3.4m20.0008(m2K)/W1.069m33.53W/(m2K)1010.5126564.58m3/h2500W3.554m24.5%3,,,,3R134a,Cavallini2Zecchin,Vampola,,[1]ShahMM.Ageneralcorrelationforheattransferdur2ingfilmcondensationintubes.InternationalJournalofHeatandMassTransfer,1979,1852196.[2]CavalliniA,ZecchinR.Adimensionlesscorrelationforheattransferinforcedconvectioncondensation6thInternationalHeatTransferCongress,1974,(3):3092313.[3]DobsonMK,ChatoJC.Condensationinsmoothhori2zontaltubes.InternationalJournalofHeatTransfer,1998,120:1932213.[4]GiovanniLozza,UmbertoMerlo.Anexperimentalin2vestigationofheattransferandfrictionlossesofinter2ruptedandwavyfinsforfin2and2tubeheatexchangers.InternationalJournalofRefrigeration,2001,24:4092416.[5]RBassi,PKBansal.In2tubecondensationofmixtureofR134aandesteroil:empiricalcorrelations.Interna2tionalJournalofRefrigeration,2003,26:4022409.[6],,.R134a.,2006,6(6):54256.561: