地源热泵的套管式地下换热器传热研究

X,,,,(,300072):,,,,1:;;:TU11111:A:049322137(2001)0420345203,,.,,.[1,2],.11.1,Ts.,Ts,.,.Ts(x,S)xSKusuda[3]ts(x,S)=tm+Amexp(-w2Asx)coswS2w2Asx(1):x,m;S,h;ts(x,S)Sx,;tm,;Am,;w,w=2PöT=0.00071725;T,T=8760h;As,m2ös.1.2[4],,RG=I(Xr4)Ks(2),I(Xr4)=Xr4e-x2xdx;Xr4=r42asSRF:F,F=1,F;S0,s;Ks,Wö(m).1.32.,,.3.23,,Wadt1=KW(t2-t1)dX+KF(ts-t1)dXWadt2=KW(t2-t1)dX(3):X=xöL0;Wa=maCp;KF=kFPd4L0;KW=kPXd2L0;Wa,Wö;Cp,Jö(kg);ma,kgös;L0,m;x,m;d2d4,m(1);t1t2ts,;Jw,Wö(m2);JF,Wö(m),,35320026JOURNALOFTIANJINUNIVERSITYVol135No13May2002X:2001209230.:(59776015)1:(1964-),,,.©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1Fig11Thecrosssectionofverticalheatexchanger2Fig.2Modelofverticalheatexchanger3Fig13ThermalfieldoffluidintubeJw=11A1d2d1+d22Kp1ilnd2d1+1A2JF=1d4RG2+d42Kp1olnd4d3+d4A3d3(4):d1d3,m(1);Kp1iKp1o,Wö(m);A1A2A3,Wö(m2),([5]):Nu=01018Re0182Pr0152Nu=01023Re0180Pr0140Nu=01016Re0182Pr0152(5):H1=ts-t1,H2=ts-t2,a=KWöWa,b=(KW+KF)öWa:H,;ab.(3)dH1ödX=aH2-bH1dH2ödX=aH2-AH1(6)d’Alambert’s,H1=C31exp(M21X)-C32exp(M22X)(7)H2=C32q23p2exp(M22X)-C31q1p1exp(M21X)(8):H1(X=0)=H1(9)H1(X=0)=H2(X=1)(10)C31C32C32=H1(1+q1p1)exp(M21)-(1+q1p1)exp(M21)+(1+q2p2)exp(M22)C31=H1+C32:M2i=015KFWa(-11+4KWKF)(i=1,2)piqi=v2i-aa(i=1,2):H2(X=0)=H2Qa=Wa(t2-t1)=Wa(H1-H2)[W](11)2,,:1);2)643353©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.;3);4);5).4H2H1=f(KWKF,KFWa)1Qa,4H2H1,Qa=WaH1(1-H2H1),.,4KW=0.4H2öH1=f(KFöWa,KWöKF)Fig14H2öH1=f(KFöWa,KWöKF)5,$tWa5$t=f(Wa,KF)Fig15$t=f(Wa,KF);,KF,,$t,.3,,,..,,,.0,,,,1,..:[1]YanGu,DennisLONeal.Modellngtheeffectofback2fillsonU2tubegroundcoilperformance[J]1ASHRAETrans11998,104(2):356-365.[2]ThorntonJeffW,HughesPatrickJetal.Residentialver2ticalgeothermalheatpumpsystemmodels:calibrationtodata[J].ASHRAETrans,1997,103(2):660-674.[3].[M].:,1983.[4]CaneRLD.EngP,ForgasDA1Modelingofground2sourceheatpumpperformance[J].ASHRAETrans,1997,(2):909-925.[5]BurmeisterLC1Convectiveheattransfer[M]1JohnWil2ley&Sons,NewYork,1983.HeatTransferResearchonUndergroundCoaxialPipeHeatExchangerforGroundSourceHeatPumpZHAOJun,YUANWei2feng,ZHUQiang,ZHOUQian,GONGYu2lie(SchoolofElectricalEngineeringandEnergy,TianjinUniversity,Tianjin300072,China)Abstract:Inthispaper,accordingtoenergybalance,theheattransferbalanceformulafortheheatexchangerun2dershallowgroundisestablished,andthesolutionisobtained,thenthefactorsaffectingheattransferprocessareanalyzed,theheattransferenhancementmeasuresarealsoproposed1Accordingtothesolution,thecorrespondingfunctiongraphsofrelationsaregiven1Keywords:groundsourceheatpump;coaxialpipeheatexchanger;heattransferunderground74320025:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.