板式濕式空冷器濕球溫度遷移特性與優(yōu)化研究.pdf

1、同濟(jì)大學(xué)機(jī)械工程學(xué)院博士學(xué)位論文板式濕式空冷器濕球溫度遷移特性與優(yōu)化研究姓名：許旺發(fā)申請學(xué)位級別：博士專業(yè)：供熱供燃?xì)馔L(fēng)及空調(diào)工程指導(dǎo)教師：張旭20070601AbstractABSTRACTTheplatewetaircoolercombinesthetechnica／advantagesofplateheatexchangerswithdrycoolingandevaporativecoolingWhenhotclimatesin

2、summerwatersprayingrun$andoutlettemperatureofhotfluidsplaysdownbecauseheattransferisenhancedbyevaporativecoolingTheplatewetaircoolersaren州typeofcoolingequipmentsandhaveagreatmarketforegroundBytheoreticalandexperimentalme

3、thodssomekeyproblemswerelucubratedsuchasheatandmasstransfertransfercharacteristicofthewetbulbtemperatureoptimizationfortheframeandrunningfortheplatewetaircoolerTheresearchresults∞nbeusedtopopularizetheplatewetaircoolerTr

4、ansfermodelsweredevelopedwithoverallwettingconditionandpartoverallwettingand8)mewaterdropletslardinginairconditionTherelativeelTor8ofefficiencypredictionaresmallthan2percentbecauseLewisfactorisequalto|Themethodtodetermin

5、ethemeausaturatedlineslopeofmoistairWaspresentedwhichcauapplytohotwaterandairThewailwettingratehasremarkableeffectoncoolingefficiencyButwaterdropletsinaireffectsarcsmallandCanbeignoredinengineeringcalculationsInVoducingt

6、hewetbulbspecificheatcapacityandthewetbulbheat缸ansfercoefficientanewmathematicalmodelfortheplatewetaircoolerwasdevelopedbasedonthewetbulbtemperaturetransfercharacteristicAnaly(icalsolutionsfortheparallel—flowandapproxima

7、teanalyticalsolutionsforthecrossflowwerepresentedTheSolutionswerefoundtobegoodagreeswitllexperimentalresultsThetransfercharacteristicofairdry／wetbulbtemperatureandsprayingwatertemperaturewerediscussedTheLMTDmethodbasedOI

8、lthismathematicalmodelisapplicabletodesignandveri母fortheplatewetaircoolerTheratioofthewetbulbheattransfercoe伍cieattotheheathansfercoe伍cientunderaircooledconditionswasinvestigatedtheoreticallyandexperimentallyTherelativee