U型地埋管换热器热短路特性研究

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1、西南交通大学硕士学位论文U型地埋管换热器热短路特性研究姓名：杨正武申请学位级别：硕士专业：供热、供燃气、通风及空调工程指导教师：秦萍20090401西南交堕奎堂堕主塑窒竺堂垡垒窒笺!!戛—————————————————————————————————————————————————————一一AbstractGroundsourceheatPumP(GSHP)airconditioningsystemutilizegroundsoilasaheatsource／sink,achieveheattransferbetweenth

2、egroundsoilandaworkingfluidfwatcroranflfreezesolution)circulatinginaclosedloopburiedintheground·Comparedtootherconventionalalternatives，thegroundsourceheatpumpsystc：mmakesfulluseofrenewableenergy,andboaststhefeaturesofprotectingtheenviro姗entandreducingelectricpowerco

3、nsumption．IthasbeenappliedmEuropeandAmericantoalsoinChina，andafewGSHPpilotprojcotshavebeencompletedU．tubegroudheatexchangeringroundsourceheatpumpsystemusestheneattransferbetweenU．tubeandtheearthtoachieveheatingandcoolingrequirements·Bvusingtheearthasaheatsourceandhea

4、tsink，thehotheatwasremovedfromthesvstemtothesoilthroughtheheattransferbetweenthefluidofU-tubeandthesoilinsummer，whilethehotheatwasremovedfromthesoiltothesystemmwinter．Infact．becausethespacebetweenthetwoU—tubesissmall，thetemperaturedifferencesexistbetweenthetwopipes，t

5、herefluxheatsituationisboundtohappenbetweenthetwopipeswhenthefluidflowfromonepipe，afterheatexchangewiththesoil，tothe0therpipe．Thephenomenonhavetheeffectoftheheatexchangewhichiscalledhotshort．circm“situation．Hotshort．circuitsituationshouldbepayspecialattentiontointhed

6、esignandinstallationoftheverticalU—tubeheatexchanger．Buttherearelessstudiesoftheeffectofhotshort·circuitsituation．lnthepaper'basedontestdataofaU．tubeheatexchangersingroundsourceheatpumpprojectinChengdu，analysethetestresultsoftheeffectofhotshort．circuitsituationinsumm

7、erandwinterconditions，setuphethree’dimensionalheattransfermodelofU—tubeheatexchangerusingtheenergybalancemethod．dividetheheatexchangeoftheverticalU-tubeheatexchangerintotw0zones．0neiscaliedboreholes，theotheriscalledboreholesoutsidetotheunlimiteddistance．Throughacompa

8、rativeanalysisiofthesimulationresultsandthemeasured西南交通大学硕士研究生学位论文第1II页results，correctionmodelrepeatedlytoverifythemodelmethodandth