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

TAN Yingying; WANG Lin; BAI Depo; YAN Xiaona

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

更新时间：2025-11-26

- Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation
- CIESC Journal Issue S2, Pages: 107-112(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161422
  CLC： B657.4
- Online First：30 December 2016，
  
  Published：30 December 2016
- 稿件说明：
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TAN Yingying, WANG Lin, BAI Depo, et al. Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation[J]. CIESC Journal, 2016, (S2): 107-112.
DOI：

TAN Yingying, WANG Lin, BAI Depo, et al. Performance of R23/R134a auto-cascade refrigeration cycle with one-step dephlegmation and two-step dephlegmation[J]. CIESC Journal, 2016, (S2): 107-112. DOI： 10.11949/j.issn.0438-1157.20161422.

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。

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.

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