污水热利用的相变换热器强化换热分析

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1、·重庆大学硕士学位论文theinfluencetoperformancecausedbydifferentheattransferstructureandfluidinletway.Thispaperfoundtheoptimumheatexchangerperformanceconditionsbyanalyzingthedataofexperimentalgroupandthecontrol.Alsotheflow-heattransferperformanceoftheevaporator,condensersectionoftheexchangerwastestedundert

2、heconditionofvariableflow.Theexperimentaldataandthetheoreticalcalculationswascomparedandexperimenterrorwasanalyzedafterthisexperiment.Followingconclusionsdrawninthispapercomparedtheexperimentaldataandthecontrol.1)Wayfluidinlethasaneffectontheperformanceofheatexchangerincontrolgroup.Theoptimalper

3、formanceofcontrolgroupappearsintheworkingconditionofthesewageandthewaterflowsfromtheupperpartofheatexchanger.2)Flowrateinthecondensationsectionisinfluentialtotheperformanceoftheheatexchangerintheexperimentalgroup.Heattransferandheattransfercoefficientwiththesewageflowrateincreases.Theratioofevap

4、orationsectionlengthandcondensationsectionlengthhasquiteaneffectontheperformanceofheatexchanger.Theoverallheattransfercoefficientincreasedby35%and56%respectivelyastheratioofllchangesfrom1/2480/220to1and220/480.3)Performanceimprovedsignificantlyaftertheinstallationofbaffles.4)Theoptimalperformanc

5、eofexperimentalgroupwithvariableflowoperationinevaporationandcondensationappearsinminimumwaterflow.ThevalueofEequalsto2.19and415.39respectivelyatthismoment.hfand1Keywords:UrbanSewage,PhaseChangeExchanger,HeatTransferEnhancement,Baffle···IV···目录目录中文摘要..............................................

6、............................................................................................I英文摘要.......................................................................................................................................III1绪论..........................................................

7、...............................................................................11.1研究背景..................................................................................................................................11.2城市污