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U形垂直埋管直接膨胀式地源热泵的性能分析(英文).docx

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U形垂直埋管直接膨胀式地源热泵的性能分析(英文) PerformanceAnalysisofU-ShapedVerticalBuriedTubeDirectExpansionGroundSourceHeatPump Introduction Theincreasingdemandforrenewableenergyhasledtothedevelopmentofgroundsourceheatpumps(GSHPs)asaviablealternativetotraditionalheatingandcoolingsystems.AmongthevarioustypesofGSHPs,U-shapedverticalburiedtubedirectexpansion(UVB-DE)systemshavegainedpopularityduetotheirhighefficiency,reliability,andcost-effectiveness.Inthispaper,weanalyzetheperformancecharacteristicsofaUVB-DEsystemanddemonstrateitseffectivenessforvariousheatingandcoolingrequirements. SystemDescription TheUVB-DEGSHPsystemconsistsofaheatpumpunit,agroundheatexchanger(GHEX),andadistributionsystem.TheheatpumpunitisresponsibleforthetransferofheatenergyfromtheGHEXtothebuildingduringheatingmodeandfromthebuildingtotheGHEXduringcoolingmode.TheGHEX,whichistypicallymadeofhigh-densitypolyethylene(HDPE)pipes,isburiedverticallyinthegroundandcontainsarefrigerantthatcarriesthethermalenergy.Duringoperation,therefrigerantabsorbsheatenergyfromtheGHEXintheheatingmodeandreleasesitinthecoolingmode. PerformanceAnalysis ToanalyzetheperformancecharacteristicsoftheUVB-DEsystem,weconductedexperimentsundervariousoperatingconditionsandevaluateddifferentperformanceparameters.Theresultsoftheanalysisaresummarizedbelow. CoefficientofPerformance(COP) TheCOPisameasureoftheheatpump'sefficiencyandisdefinedastheratiooftheheatingorcoolingoutputtotheelectricityinput.TheCOPfortheUVB-DEGSHPsystemwasfoundtobeintherangeof3.5to4.5,whichishigherthanthatoftraditionalsystems,indicatingitshighefficiencyandsuitabilityforresidentialandcommercialapplications. HeatTransferRate TheheattransferrateisanimportantperformanceparameterthatdeterminestheamountofheatthatcanbetransferredbetweentheGHEXandtherefrigerant.WeevaluatedtheheattransferratebyvaryingtherefrigerantflowrateandthetemperaturedifferencebetweentheGHEXandtherefrigerant.Theresultsshowedthattheheattransferrateincreasedwithanincreaseintherefrigerantflowrateandtemperaturedifference,indicati