自复叠制冷系统非共沸混合制冷剂特性研究.pdf

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1、自复叠制冷系统非共沸混合制冷剂特性研究1,22111芮胜军张华梁坤峰董彬李健(1河南科技大学制冷技术研究所洛阳471003；2上海理工大学制冷技术研究所上海200093)摘要非共沸混合工质冷凝是温度不断降低的变温冷凝过程，气相和液相的组分也不断变化。当冷凝器出口温度为300K时，液相混合工质R600a/R23/R14的质量比例为78.04/12.62/9.34，冷凝液大部分为R600a，但含有相当数量的中低沸点工质。冷凝温度降低至280K时R600a在气相中的比例为9.8%，即使冷凝温度降低到组分配比35/35/30的泡点温度249.

2、49K，R600a在气相的质量百分含量仍然占2.67%。相分离器I能够分离78.04%的高沸点工质R600a，但低沸点工质R14在液相中占9.34%。相分离器II只能分离30.27%的R23，12.62%依靠相分离器I分离，其余的R23都带入到蒸发器。R600a在蒸发器内仍然有6.31%的含量，低沸点工质R14在蒸发器内仅占45.64%。关键词自动复叠制冷R600a/R23/R14组分变化特性非共沸混合制冷剂CHARACTERISTICSSTUDYONNON-AZEOTROPICMIXTUREOFAUTO-REFRIGERATINGC

3、ASCADESYSTEM1,22111RuiShengjunZhangHuaLiangKunfengDongBinLiJian(1.InstituteofRefrigerationTechnology,HenanUniversityofScienceandTechnology,Luoyang,471003;2.InstituteofRefrigerationTechnology,ShanghaiUniversityofScienceandTechnology,Shanghai,200093)AbstractThecondensatio

4、nprocessofnon-azeotropicmixedrefrigerantisatemperaturedecreasingprocess.Meanwhile,theconcentrationsofvaporandliquidcontinuouslychange.Whentheoutlettemperatureofcondenserwas300K,themassratioofR600a/R23/R14inliquidphasemixturewas78.04/12.62/9.34,respectively.TheR600awasth

5、edominatecomponentintheliquidmixture.However,italsocontainedconsiderableamountsofmiddleandlowboilingrefrigerant.Whenthecondensingtemperaturewasreducedto280K,themassratioofR600ainvaporwas9.8%.Evenifthecondensingtemperaturewasdecreasedto249.49K(thebubblepointtemperatureof

6、35%R600a/35%R23/30%R14),themassratioofR600ainvaporstillreached2.67%.Thevapor-liquidequilibriumgravityseparationmethodcouldn’tseparatemixed-refrigerantcompletely.TheseparationratioofR23byphaseseparatorIandphaseseparatorIIwere12.62%and30.27%,respectively.TherestoftheR23we

7、ntintotheevaporator.PhaseseparatorIcouldseparate78.04%oftherefrigerantR600awithhighboilingpointtemperature.Therewere9.34%R14(lowboilingrefrigerant)inliquid.ThemassratioofR600ainevaporatorstillreached6.31%.ThelowboilingrefrigerantR14onlyaccountedfor45.64%init.KeywordsAut

8、o-refrigeratingcascadesystemR600a/R23/R14CompositionchangecharacteristicsNon-azeotropicmixture基金项目：国家自然科学基金项目(