Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation

doi:10.11949/j.issn.0438-1157.20161422

CIESC Journal ›› 2016, Vol. 67 ›› Issue (S2): 107-112.DOI: 10.11949/j.issn.0438-1157.20161422

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Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation

TAN Yingying^1,2, WANG Lin¹, BAI Depo¹, YAN Xiaona¹

1. Institute of Heat Pump, Air-Conditioning and Refrigeration, Henan University of Science and Technology, Luoyang 471023, Henan, China;
2. School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China

Received:2016-10-09 Revised:2016-10-19 Online:2016-12-30 Published:2016-12-30
Supported by:
supported by the National Natural Science Foundation of China (U1204525,50906021,U1504524) and Henan Province Office of Education(15A480001).

R23/R134a一级分凝和二级分凝自复叠喷射制冷循环性能理论分析

谈莹莹^1,2, 王林¹, 白得坡¹, 闫晓娜¹

1. 河南科技大学热泵空调技术研究所, 河南洛阳 471003;
2. 湖南大学土木工程学院, 湖南长沙 410082

通讯作者: 王林
基金资助:
国家自然科学基金项目（U1204525，50906021，U1504524）；河南省高等学校重点科研项目计划项目（15A480001）。

Abstract

Abstract:

Theoretical analyses on auto-cascade ejector refrigeration cycle with one-step dephlegmation and two-step dephlegmation were performed to discuss the influence of mixed refrigerant composition, condensing temperature and refrigeration temperature on the cycle performance using zeotropic mixture refrigerant R23/R134a.The results show that when the mass fraction of the low boiling point component in the mixed refrigerant increases, the ejector pressure ratios decrease and the cycle COP increases, when condensing temperature increases, the ejector pressure ratios increase and COP decreases significantly, and when evaporating temperature increases, the ejector pressure ratios decrease, and the cycle COP increases.Under the same working conditions, COP of two-step dephlegmation cycle is greater than that of one-step dephlegmation cycle.Two-step dephlegmation cycle can obtain lower refrigeration temperature at -15℃ under the pressure ratio of ejector is about 1.8.

Key words: R23/R134a, ejector refrigeration, auto-cascade refrigeration, dephlegmation

摘要：

基于非共沸混合工质自复叠原理应用于喷射制冷循环的研究，对一级分凝和二级分凝自复叠喷射循环进行了理论分析，研究了使用R134a/R23非共沸混合工质时制冷剂的配比、冷凝温度和蒸发温度对两种循环性能的影响，结果表明：随着低沸点组分R23质量分数由0.10增至0.20，一级分凝循环喷射器压比在3.4附近变化，而二级分凝循环喷射器压比在1.8附近变化，两种循环COP均增大；随着冷凝温度由18℃升至23℃，一级分凝循环喷射器压比由3.242增至3.792，而二级分凝循环喷射器压比由1.860升至1.867，两种循环COP均降低；随着蒸发温度由-10℃降至-15℃，一级分凝循环喷射器压比由3.454降至2.832，而二级分凝循环喷射器压比由1.870降至1.840，两种循环COP均升高，并且在相同工况下，二级分凝循环COP远高于一级分凝循环；二级分凝循环在喷射器压比为1.8时，可获得-15℃温区的制冷温度。

关键词: R23/R134a, 喷射制冷, 自复叠制冷, 分凝

CLC Number:

TB657.4

TAN Yingying, WANG Lin, BAI Depo, YAN Xiaona. Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation[J]. CIESC Journal, 2016, 67(S2): 107-112.

谈莹莹, 王林, 白得坡, 闫晓娜. R23/R134a一级分凝和二级分凝自复叠喷射制冷循环性能理论分析[J]. 化工学报, 2016, 67(S2): 107-112.

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Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation

R23/R134a一级分凝和二级分凝自复叠喷射制冷循环性能理论分析

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