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《地源熱泵地理埋管換熱器不同運(yùn)行模式實(shí)驗(yàn).研究與模擬》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、摘要differentflowrateandoperatingmodewereappliedforexperimentaltesting，accordingtothedifferentoperatingmode，threephasesofexperimentaltestinghadbeendivided，theywereall—daycontinuousoperation，daytimeoperationonly,andall—dayintermittentoperation．All—daycontinuousoperationmodewasseparatedintothreep
2、artsbasedontheflowrateof0．65m3／h，0．7m3／h，and0．8m3／h．Theresultsshowed，thebestaveragequalityofheattransferpermeterofboreholeandcoefficientofsystemperformanceare53．66W／mand3．91W／Wrespectivelyatthe0．8m3／hflowrate．So0．8m3／hwaschosenastheexcellentflowrateoftheexperimentaltesting，intermofdifferentra
3、tioofon—offtime，daytimeoperationonly,anliall-dayintermittentoperationweredeployed．Itfoundthatthequalityofheattransferbecameincreasinglyreducedalongwiththetimeprolonged．Underthesamecondition，thesystemperformanceofintermittentoperationisbetterthantheall—daycontinuousoperation，thedaytimeoperatio
4、nonlywasthebestamongthem，theaveragequalityofheattransferpermeterofboreholeandcoefficientofsystemperformanceare55．14W／mand3．96W／Wrespectively．Finally,basedonheattransfermechanismofU-tubeunderground，forasingleborehole，atransientone—dimensionalline-sourcemodeloutsideboreholeandquasi·-three--dime
5、nsionalsteady-·statemodelinsideboreholewerepresented．InviewofdifferentoperationmodeofGSHPVI南京師范大學(xué)碩士學(xué)位論文systemwouldcausetime—varyingloads，heatpulseanalysistheorywasused．Underthecontinuousoperationmode，aseriousofcontinuousrectangularheatpulseswasapproximatedbyaseriousstepheatpulse；undertheinter
6、mittentoperationmode，aperiodofcyclicheatingofthegroundwasapproximatedbythesummationofacontinuousmeanloadandasingleheatingpulse．Then，superpositionwasappliedtodealwithsuchvariableanddiscontinuousloads．Combinedwiththermalresistanceinsideborehole，theinlet&outletwatertemperatureofU-tubeexchangerco
7、uldbesimulated．Comparedthesimulatedvalueswithexperimentalresults，theaverageabsoluteerrorandaveragerelativeerrorisSOlittle．Thiscomparisonsuggestedthemodelinghashighaccuracyandrationality,andcanbeusedtoinstructpeopletodesign，simulatetheU—tubehe
