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作 者:芮胜军[1,2] 张华[2] 贺滔[1] 罗浩[1]
机构地区:[1]河南科技大学车辆与交通工程学院,洛阳471003 [2]上海理工大学制冷技术研究所,上海200093
出 处:《制冷学报》2016年第4期39-45,共7页Journal of Refrigeration
基 金:国家自然科学基金(51176124)资助项目;河南省重点攻关项目(152102210279);河南省高等学校重点科研项目(15A470001);河南科技大学青年科学基金(2015QN014)项目资助~~
摘 要:非共沸混合工质冷凝是温度不断降低的等压冷凝过程,气相和液相组分不断变化。当冷凝器出口温度为300 K时,液相混合工质R600a/R23/R14的质量分数为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280 K时,R600a在气相中的比例为9.8%,即使冷凝温度降低到质量分数35/35/30的泡点温度249.49 K,R600a在气相的质量分数仍然占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都被带入到蒸发器。R600a在蒸发器内仍然有6.31%的含量,低沸点工质R14在蒸发器内占45.64%。The condensation process of non-azeotropie mixed refrigerant is a isobaric process. Meanwhile, the concentrations of vapor and liquid continuously change. When the outlet temperature of condenser is 300 K, the mass fraction of R600a/R23/R14 in liquid phase mixture is 78.04/12.62/9.34, respectively. The R600a is the dominant component in the liquid mixtures. However, it also contained considerable amounts of middle and low boiling refrigerants. When the condensing temperature is reduced to 280 K, the mass fraction of R6OOa in vapor is 9.8%. Even if the condensing temperature is decreased to 249.49 K ( the bubble point temperature of 35% R6OOa/ 35% R23/30% R14) , the mass fraction of R600a in vapor phase still reaches 2.67%. The vapor-liquid equilibrium gravity separation method couldn't separate mixed refrigerants completely. The separation ratio of R23 by phase separator I and phase separator II are 12. 62% and 30.27%, respectively. The rest of the R23 goes into the evaporator. Phase separator I could separate 78.04% of the refrigerant R600a with high boiling point temperature. There are 9.34% RI4 (low boiling refrigerant) in liquid phase. The mass fraction of R600a in evaporator still reaches 6.31%, the low boiling refrigerant R14 accounts for 45.64%.
关 键 词:自动复叠制冷 R600a/R23/R14 组分变化特性 非共沸混合工质
分 类 号:TB657[一般工业技术—制冷工程] TB64
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