相變傳熱增強及相變貯能系統(tǒng)研究.pdf

1、中國科學技術大學碩士學位論文相變傳熱增強及相變貯能系統(tǒng)研究姓名：程丹鵬申請學位級別：碩士專業(yè)：制冷與低溫工程指導教師：葉宏20060601中國科學技術大學碩士學位論文ABSTRACTPhasechangematerialswillbewidelyutilizedduetoadifferentialpricingsystemforpeakandoffpeakperiodsofenergyuseBasedontheneedsofapplic

2、ations，theoreticalanalysisstudiesweredoneasfollows1BasedontheexperimentsdoneinBeijing，themodelofradiantfloorheatingsystemwithform—stablePCMasthethermalmasssetupbeforewasmodifiedThethermalperformanceofthesystemWassimulate

3、dbyusingthemodifiedmodelThecalculatedresultsagreewellwiththoseoftheexperimentsThenthemodelwasusedtoinvestigatetheeffectsofthemeltingpoint，thephasechangelatentheat，thephasechangeradiusandtheheatingpoweroftheform—stablePCM

4、ontheperformanceofthesystem2Thethermalresistanceofthephasechangematerialinthetubeismuchlargerthanthatbetweenthetubeandthewaterflowingintheshell—side，physicalmodelofphasechangeheatstoragetubewithfinswassetuptoexploretheen

5、hancementoftheheattransferofthetubeNumericalsimulationstudyontheheattransferprocessofthephasechangematerialinsidetubewascarriedouttoanalyzetheinfluencesofdifferentparametersoffintotheheattransferinsidetubeAschemefordesig

6、ningthefinsintubeundercertainexternalconditionswasproposed3Selectingarepresentativeschemeofthearrangementoftheheatstoragetubes，physicalmodelofshell—and—tubephasechangeheatexchangerwassetupNumericalsimulationstudyonthehea

7、ttransferprocessoftheheatexchangerWascarriedouttoanalyzetheinfluencesofdifferentparameterssuchasthermalconductivitymassflowrate，entrancetemperatureandlengthtothecapabilityoftheexchangerKeywords：radiantfloorheatingsystem；