污水源热泵机组换热器强化传热性能的分析与cfd设计

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1、AbstractIntheworld'sgrowingenergycrisis,energyconservationandenvironmentalprotectionistheresponsibilitythatweshouldassume.SpecifictotheHVACindustry,Wetrytofindawaythatnotonlytoachievethecomfortofthelivingenvironment,butalsotosaveenergyandreducepollutionandprotecttheen

2、vironment.Sewagesourceheatpumpissuchawaythatitisadevicewhichtransferthecoldandtheheatofsewagetotheairconditioningsystem.Theuseofresourcesistheurbansewage,andurbansewageisineverydayproductionandinexhaustible.Becausesewageisboundtobedischargedintotheenvironment,itisenvi

3、ronmentallyfriendlyandenergy-efficientintheapplicationofthewastewaterre-use.Sewagesourceheatpumpwillinevitablybecomethehottrendofenergysaving.Ofcoursethesewagepumpsystemhasthegreatadvantage,butifthequantityandqualityoftheheattransferinheatpumpunitsisnotinagoodsituatio

4、n,everythingisofnopracticalsignificance.Thenweneedtolookingforawaytoenhancetheheattransferprocesswhichcouldmakethehighestutilizationoftheheatandcoldextractedfromsewage,whileatthesametimeitistoachievethepurposeofenergysavingandenvironmentalprotection.Thepowerofheatpump

5、operationwillbeelectricityandheat.Consumptionofheat-poweredabsorptionheatpumphastheadvantagesofenergysavingandenvironmentalprotectioncomparedtotheelectricity-poweredcompressionheatpump.Usingthecombinationofsewagesourcedrivenabsorptionheatpumpunitmakesenergy-savingande

6、nvironmentaleffectsbetterTheheatexchangerofabsorptionsewagesourceheatpumpismainlyoccurintheevaporatorandabsorber.Tostrengthentheheattransferinordertomaximizetheenergyutilization,wemustmakeoptimumdesignintheformofheatexchangerandheattransfertube.Withthecontrastanalysis

7、wefoundthatthesprayheatexchangerenablesfluidtotop-downflowoftheliquidfilmintheformandtheeffectofheattransferisthebestinthemembraneflowsituation.However,iftheheatexchangetubesaresmoothsurfaces,theliquidfilmwhichformedfromtheliquiddistributoruniformflowintotheheatexchan

8、gerfluidwillunevenonareaandliquidholdup,itwillaffecttheheattransferperformance.Ifwecoatedwithalayerofcoppermeshintheheattran