rgyconsumedworldwide(MaloandSilva,)..MathematicalformulationIngeneral,condensersandevaporatorsforrefrigerationapplicationsaredesignedconsideringthecoilfloodedwithtwo-phaserefrigerant,andalsoawalltemperatureequaltotherefrigeranttemperature(BarbarossaandHermes,),insuchawayasthetemperatureprofilesalongthestreamsarethoserepresentedinFig..Inaddition,theouter(e.g.,air,water,brine)sideheattransfercoefficientandthephysicalpropertiesareassumedtobeconstant.Therefore,theheattransferrateifcalculatedfrom:()whereisthemassflowrate,Ti,ToandTsaretheinlet,outletandsurfacetemperatures,respectively,QhAs(TseTm)istheheattransferrate,Tmisthemeanflowtemperatureovertheheattransferarea,As,andεistheheatexchangereffectiveness,calculatedfrom(KaysandLondon,):()whereNTUhAs/mcpisthenumberoftransferunits.Thepressuredrop,ontheotherhand,canbecalculatedfrom(KaysandLondon,):()w流体性质与温度无关。
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