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《R134a空气源热泵热水器实验研究与性能分析-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第230S14卷年第63月期R134a空气源热泵热水器实验研究与性能分析Vo1.35,No.3June。2014文章编号:0253—4339(2014)03—0071—07doi:10.3969/j.issn.0253—4339.2014.03.071R134a空气源热泵热水器实验研究与性能分析王志华郑煜鑫郝吉波李晶超王沣浩(1西安交通大学能源与动力工程学院西安710049;2西安交通大学人居环境与建筑工程学院西安710049)摘要对一台工质为R134a的空气源热泵热水器样机进行了实验测试,研究了在环境温度为20/15℃工况下.最佳充灌量(1500g)的70%,85%,100%和
2、115%下的系统特性,并在最佳充灌量下研究了膨胀阀开度分别为30%,45%,60%时的系统性能。结果表明系统性能随充灌量增加呈先增大后减小趋势。膨胀阀开度对系统逐时COP影响较大,在水箱温度超过32时.增大膨胀阀的开度可以提高系统的COP。此外,基于实验研究,论文对系统l煳损失进行了分析。结论表明系统主要的焖损失分布在压缩机和冷凝器。系统煳效率随着水箱温度的升高而不断减小,在开度为30%和60%下,系统炯效率分别下降约8%和10%左右。关键词空气源热泵热水器;充灌量;膨胀阀开度;R134a;炯分析中图分类号:TB657;TB614文献标识码:AExperimentalInvest
3、igationandPerformanceAnalysisonR134aAirSourceHeatPumpWaterHeaterWangZhihuaZhengYuxinHaoJiboLiJingchaoWangFenghao(1.SchoolofEnergyandPowerEngineering,Xi’anJiaotongUniversity,Xi’an,710049,China;2.SchoolofHu—manSettlementsandCivilEngineering,Xi’anJiaotongUniversity,Xi’an,710049,China)AbstractExp
4、erimentsofanairsourceheatpumpwaterheater(ASHPWH)prototypeusingR134awerecarriedoutandtheefectsofim—properrefrigerantchargeandincorrectTXVopeningonthesystemwereanalyzed.Theperformanceofthesystemweremeasuredincombi—nationsoffourrefrigerantcharges,i.e.70%,85%,100%and115%oftheoptimalvalue,andthree
5、TXVopening,i.e.30%,45%and60%offullopeningatambienttemperatureof20/15oC.TheresultsshowedthatthesystemCOPwasincreasedtoapointandthenten—dedtodecreasewiththeincreaseofrefrigerantcharge;theexpansionvalveopeninghadasignificantimpactonperformance,andinereas—ingtheTXVopeningcanenhanceCOPwhenwatertem
6、peratureisabove32℃.Basedontheexperimentalinvestigations.anexergyanaly—siswasconductedtoevaluatethethermodynamicperformanceofthesystemandcomponentsinthisstudy.Itwasfoundthatexergylosingofthesystemmainlyoccuredinthecompressorandcondenser.Thesystemexergyeficiencywasdecreasedwiththeincreaseofwate
7、rtemperature.anditwasdecreasedby8%and10%respectivelywhentheexpansionvalveopeningwas30%and60%.KeywordsASHPWH;refrigerantcharge;TXVopening;R134a;exergyanalysis空气源热泵热水器根据逆卡诺循环从较低温度优化研究将对热泵热水器系统性能改善起到重要作的空气中吸取热能,通过压缩机做功,将热能供给用一。较高温度的热源即储热水箱,其系统具有
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