低Re下板式换热器性能的实验研究及热力学分析

6120073JournalofThermalScienceandTechnologyVol.6No.1Mar.2007:167128097(2007)0120038207:2006207217;:2006212228.:(19652),,,,,.Re1,1,1,1,1,1,2(1.,116012;2.,116032):Re(200Re1300),Re,,;,,:;;;:TK124:A019,,,,,,,,,,,,,[1][3],,;[4],,,;Yasar[5],1200Re4000,,Nu,,,,;Focke[6],:60,fjB=6080,fj,7280,;Gut[729](),;Rao[10][2]0.20.6mös,,,,Re,ReAB,1,,1;,,,,,;;,0.1;,0.1kPaAgilent34970,10,,A(GX2749)B(B32052225)Re(2001300)11.2.3.4.5.6.7.8.9.1Fig11Experimentalloop1Tab11GeometricalSpecificationsofPlateheatexchangerömmömmömmömmömmöm2ömmömmö()A837111110.5360.0782.545B625111110.4240.05101.56022.1,Re,:Nu=CõRemõPrn(1)12A1=k1DeõCõRem1õPr0.33331(2)A2=k1DeõCõRem2õPr0.33332(3)931:ReA1A2=k1k2õPr1Pr20.3333Re1Re2m(4)A0,A0=k1k2õPr1Pr20.3333(5)(5)(4)A1=A0õRe1Re2mõA2(6)1K=1A1+1A2+Rp+Rf(7)Rp=Dkp(8):Rp,(m2õK)öW;D,m;kp,Wö(mõK);Rf,(m2õK)öW,,Rp=0(3)(4)(7)1K=1A0õRe1Re2m+1õ1A2+Dkp(9)A2=1+A-10Re1Re2m1K-Dkp(10),,(9)A2m,mC2.2,,Eu,EuRe$p=fõLDeõQu22(11)$p=EuõQu2(12)(11)(12)f=2$põDeLõQu2(13)Eu=$pQu2(14),fEu,Re,,33.123,(0.020.11mös),,,,AB,,;,BA20%,ABA:Nu=0.0089Re1.0851Pr0.3333Eu=53.075Re-0.3612(200Re1300)2Fig12ComparisonofheattransfercoefficientbetweenAandB3Fig13ComparisonofpressuredropbetweenAandB0464,10%,B:Nu=0.0083Re1.166Pr0.3333(200Re800)54(A)Fig14Comparisonofoverallheattransfercoefficientbetweenexperimentalandcalculated(A)5(B)Fig15Comparisonofoverallheattransfercoefficientbetweenexperimentalandcalculated(B)3.2AB,,60,,,,,B45,,PHEB45,,[3]60,,,,60,,,,,,;,,,AB,,,Re,;,44.16,Ac,l,T,p,h,s,qdx,dSgen=qmdS-qdxT+$T(15)qmdh=qdx(16):dh=TdS+Vdp(17)(15)(17)Sgen=dSgendx=q$TT21+$TT2+qmQT-dpdx(18)141:Re$TnT,$TöT06Fig16HeattransferelementofchannelsectionNu=qDelõ$Tõk(19)-dpdx=fõQu22De(20)(19)(20)(18)Sgen=q2T2kõDelNu-1+qmQTõQu22Deõf(21):NufRe,,,Re,Nu,;Re,,SgenRe,(21):$Sgen=52T2kõDeAõNu-1+qmu2TõLDeõf2(22)$Sgen=52T2kõDeAõNu-1+qmu2TõLDeõf21,2(23)4.2,Y=T0$Sö5(24)Y,Y,,YReA,(24)Y=T05õDe0.0089AõT2õkõPr0.3333õRe-1.0751+0.455LDeõAcõL3Tõ5õQ2õD3eRe2.6388(25)YReA7A,,Y,Re8,,,Re,Y,,,A,Y8000W,80Löh,10kPa,A,3.29m2,7,Re335,,Re315,,,7YFig17EffectofheatfluxonY8YFig18EffectofheattransferareaonY5Re246AB,,,Re,,;,,A,,Y,Re;,,Re,Y,,A,m2De,mfk,Wö(mõK)K,kWö(m2õK)l,mL,m$p,kPaqm,kgöhq,WömS,kJö(kgõK)Sgen,kJö(kgõK)u,mösYA,kWö(m2õK)5,W(References):[1],,.[J].,2003,83(2):65268.LIUYan,HEGuo2geng,LAIXue2jiang.Investigationoftheeffectsofthecorrugateddimensiononheattransferperformancesofplateheatexchangers[J].Refrig,2003,83(2):65268.(inChinese)[2].[M].:,1987.ZHUPin2guan.Heatexchangeprinciplesandcalculations[M].Beijing:TsinghuaUniv.Press,1987.(inChinese)[3].[J].,2001(30):123.ZHAOZhen2nan.Effectsofthecorrugatedinclinationangleonheattransferandresistanceperformancesofplateheatexchangers[J].Petro2ChemEquip,2001(30):123.(inChinese)[4],.[J].,1996(8):12215.XUShu2hu,ZHOUMing2lian.Experimentalstudyofthepressuredistribution,flowstokeandflowtypedisplayintheflowpathattheentranceandexitofaplateheatexchanger[J].EnergyConservation,1996(8):12215.(inChinese)[5]ISLAMOGLUAY,PARMAKSIZOGLUC.Theeffectofchannelheightontheenhancedheattransfercharacteristicsinacorrugatedheatexchangerchannel[J].ApplThermalEng,2003,23:9792987.[6]FOCKEWW,ZACHARIADESJ,OLIVIERI.Selectingoptimumplateheat2exchangersurfacepatterns[J].HeatTransfer,1986,108:1532160.[7]GUTJAW,FERNANDESR,PINTOJM,etal.Thermalmodelvalidationofplateheatexchangerswithgeneralizedconfigurations[J].ChemEngSci,2004,59:459124600.[8]GUTJAW,PINTOJM.Modelingofplateheatexchangerswithgeneralizedconfigurations[J].IntJHeatandMassTransfer,2003,46:257122585.[9]GUTJAW,PINTOJM.Optimalconfigurationdesignforplateheatexchangers[J].IntJHeatandMassTransfer,2004,47:483324848.[10]RAOBP,KUMARPK,DASSK.Effectofflowdistributiontothechannelsonthethermal341:Reperformanceofaplateheatexchanger[J].ChemEngandProcessing,2002,41:49258.ExperimentalinvestigationandthermodynamicanalysisofperformanceofplateheatexchangerforlowReynoldsnumberMAXue2hu1,LINLe1,LANZhong1,YUQing2jie1,YUChun2jian1,BAITao1,LINYing2(1.Inst.ofChem.Eng.,DalianUniv.ofTech.,Dalian116012,China;2.Tech.andDevelopmentDept.,DalianPetrochem.Co.,PetroChinaCo.Ltd,Dalian116032,China)Abstract:Heattransferandpressuredropperformancesoftwodifferentkindsofplateheatexchangers(PHE)wereinvestigatedinlowReynolds(200Re1300).Theeffectsofthecorrugatedinclinationangle,heightandintervalofPHEontheheattransferandpressuredropweretheoreticallyanalyzedaccordingtoexperimentaldata.Itisfoundthatthedegreeoftheeffectofintervalonheattransferisgreaterthanthatofinclinationangleandheight;butthepressuredropiflessaffected.ItcanbeobservedthattheheattransferandfrictioncorrelationsobtainedforPHEareintimatelyassociatedwithexperimentaldata.Theoreticalfoundationwasproposedforthedesignofthecorrugatedform,geometricparametersofplates,andsizingPHEintheindustrialapplicationoflowflux,highpressurespecification.Keywords:plateheatexchanger;lowReynoldsnumber;lowpressuredrop;thermodynamicanalysis446