欢迎来到天天文库
浏览记录
ID:31952708
大小:7.69 MB
页数:74页
时间:2019-01-29
《地源热泵地理埋管换热器不同运行模式实验.研究与模拟》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
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南京师范大学硕士学位论文systemwouldcausetime—varyingloads,heatpulseanalysistheorywasused.Underthecontinuousoperationmode,aseriousofcontinuousrectangularheatpulseswasapproximatedbyaseriousstepheatpulse;undertheinter
6、mittentoperationmode,aperiodofcyclicheatingofthegroundwasapproximatedbythesummationofacontinuousmeanloadandasingleheatingpulse.Then,superpositionwasappliedtodealwithsuchvariableanddiscontinuousloads.Combinedwiththermalresistanceinsideborehole,theinlet&outletwatertemperatureofU-tubeexchangerco
7、uldbesimulated.Comparedthesimulatedvalueswithexperimentalresults,theaverageabsoluteerrorandaveragerelativeerrorisSOlittle.Thiscomparisonsuggestedthemodelinghashighaccuracyandrationality,andcanbeusedtoinstructpeopletodesign,simulatetheU—tubehe
此文档下载收益归作者所有