newplateheatexchangeroptimizationselection-外文文獻(已修改)
2025-05-31 12:50 本頁面
【正文】 Newplatehatexchangeroptim entofMechanicalEngiering,ScholofEngieringandDesign,BrunelUniversity,Uxbridge,Midlesx,UK.Abstract:TheplateheatexchangerSelctionisbasedontheoptim zationoftheuseofheatexchangersandintheprocesoftheparm etrsandNTU=KA/MC=△t/△tm ,thatis,transferunitsofNTUandthetm peraturediferncethan(theaveragetm peraturedifernceHeatransferinpower)choseplateshapes,:theaveragetm peraturediferncebtwenNTUplatevaporatorcondenser1averagetmperaturedifernce△tmWhentheeatexchangertoheatdQ,whenthetm peraturerosetodt,C=dQ/dt,Cwilbedefinedasheatcapcity,itsaidunitsoftim ethroughtexchangeofheatperunitare,dQ=K(thtc)dA=K△tdA,twofthefluidtem praturechangeswerdth=dQ/Ch,dtc=dQ/Cc,d△t=d(thtc)dQ(1/Cc1/Ch),whiledA=[1/k(1/Cc1/Ch)]?(d△t/△t),whentheA=0pointstoAA0when,A0=[1/k(1/Cc1/Ch)]?㏑[(thotci)/(thitco)],becauseoftwofluidexchangebetentheeatequivalent,thatis,Q=Ch(thitho)=Cc(tcotci),thesim plifedKnow,Q=KA0([thotci)(thitco)]/㏑[(thotci)/(thitco)],if△t1=thitco,△t2=thotci,Q=0[(△t1△t2)/㏑(△t1/△t2)]=KA0△tm ,in△tm =(△t1△t2)/㏑(△t1/△t2).Down△tm =[(thitci)(thotco)]/㏑[(thitci)/(thotci)]Countercurent△tm =[(thitco)(thotci)]/㏑[(thitco)/(thotci)]Forvariousflowpaternsinthesam eim port,exportundertheconditonsoftem prature,theaveragetm peraturediferncebtwenthelargestcountercurent.Whentheplateheatexchangerim portandexportofthefluidtem praturediferncebetwenthetwo△t1andthediferncebetwen△t2notavilablewhenarithm eticaveragetem prature(△t1+△t2)/2,Genral△t1/△,Maybe,i
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