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跨临界CO_2水-水热泵热水器的系统性能初步研究.docx

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跨临界CO_2水-水热泵热水器的系统性能初步研究 Abstract Inrecentyears,thedevelopmentofenergy-efficientandenvironmentallyfriendlyheatingtechnologyhasattractedconsiderableattention.TheCO2-watercross-criticalheatpumpwaterheatersystemhasemergedasapromisingsolutionforprovidinghotwaterinresidentialandcommercialapplications.ThispaperdiscussesthesystemperformanceandenergyefficiencyoftheCO2-watercross-criticalheatpumpwaterheatersystem.Theresultsshowthatthesystemhashighenergyefficiency,lowcarbonemissions,andexcellentwaterheatingperformance. Introduction Theadoptionofrenewableenergysourcesandenergy-efficienttechnologiesisessentialinreducingcarbonemissionsandachievingsustainabledevelopment.Amongthevariousheatingtechnologies,heatpumpsystemshavegainedincreasingpopularityduetotheirhighenergyefficiency,easymaintenance,andlowcarbonemissions.TheCO2-watercross-criticalheatpumpwaterheatersystemisanewlydevelopedtechnologythatoffersseveraladvantagesoverconventionalheatingsystems.ThissystemutilizesCO2astheworkingfluidandoperatesatahigh-pressurecriticalpointtoachievehighenergyefficiency. SystemComponents TheCO2-watercross-criticalheatpumpwaterheatersystemcomprisesanevaporator,acompressor,acondenser,anexpansionvalve,andawaterstoragetank.Thesystemworksontheprincipleofvaporcompressionrefrigeration,wheretherefrigerantabsorbsheatfromthewaterintheevaporator,andthecompressorthenincreasesthepressureoftherefrigerant,causingittobecomeahigh-temperatureandhigh-pressuregas.Thishigh-temperaturegasistransferredtothecondenser,whereitreleasesheattothewaterinthestoragetank.Therefrigerantthenpassesthroughtheexpansionvalve,reducingitspressureandtemperature,andreturnstotheevaporatortocompletethecycle. SystemPerformance TheenergyefficiencyoftheCO2-watercross-criticalheatpumpwaterheatersystemismeasuredbytheCoefficientofPerformance(COP).TheCOPisdefinedastheratioofheatoutputtotheenergyinput.TheCOPofthesystemcanbeimprovedbyadjustingtheoperatingparameters,suchastheevaporatorandcondensertemperaturesandpressures.Inaddition,thewaterheatingp