Thermodynamic Analysis of Vapor Injection Heat Pump Cycle with Dry Working Fluid

Liu Jiaxin; Chen Jianyong; Chen Ying; Luo Xianglong; Liang Yingzong; He Jiacheng; Yang Zhi

doi:10.12465/j.issn.0253-4339.2024.06.041

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Thermodynamic Analysis of Vapor Injection Heat Pump Cycle with Dry Working Fluid

更新时间：2024-12-13

- Thermodynamic Analysis of Vapor Injection Heat Pump Cycle with Dry Working Fluid
- Journal of Refrigeration Vol. 45, Issue 6, Pages: 41-49(2024)
- 作者机构：
  
  1.广东工业大学材料与能源学院　广州　 510006
  2.广东省功能软凝聚态物质重点实验室　广州　 510006
- 作者简介：
  
  Chen Jianyong, male, associate professor, School of Materials and Energy, Guangdong University of Technology, 86-13544552233, E-mail: jianyong@gdut.edu.cn. Research fields: enhanced heat transfer technology of air conditioning system.
- 基金信息：
  
  the Natural Science Foundation of Guangdong Provincial Basic and Applied Basic Research Foundation(2022A1515012035);the Characteristic Innovation Research Project of University Teachers(2021JNHB07)
- DOI：10.12465/j.issn.0253-4339.2024.06.041
  CLC： TB61⁺1;TB657.5
- Published：16 December 2024，
  
  Received：12 September 2023，
  
  Revised：07 December 2023，
  
  Accepted：2023-12-08
- 稿件说明：
移动端阅览
LIU JIAXIN, CHEN JIANYONG, CHEN YING, et al. Thermodynamic Analysis of Vapor Injection Heat Pump Cycle with Dry Working Fluid. [J]. Journal of refrigeration, 2024, 45(6): 41-49.
DOI：

LIU JIAXIN, CHEN JIANYONG, CHEN YING, et al. Thermodynamic Analysis of Vapor Injection Heat Pump Cycle with Dry Working Fluid. [J]. Journal of refrigeration, 2024, 45(6): 41-49. DOI： 10.12465/j.issn.0253-4339.2024.06.041.

摘要

利用高温热泵回收工业余热具有巨大的节能潜力。高温热泵要求高临界温度，可选工质以干工质居多，但干工质从饱和气相开始压缩时，压缩过程在两相区，带来液击风险，不利于压缩机和高温热泵运行。提出了2种改进的补气增焓热泵循环（循环A和循环B），以Isohexane、R1336mzz(Z)和R1233zd(E)为工质，分析了压缩机等熵效率、蒸发温度和冷凝温度对最小过热度及热泵性能的影响。结果表明：对于循环B，蒸发温度自50 ℃升至80 ℃，对于R1336mzz(Z)，COP最高可提高2.56%，VHC（单位容积制热量，volumetric heating capacity）最高可提高3.18%；对于R1233zd(E)，COP最高可提高0.44%，VHC最高可以提高0.54%。循环A对等熵效率的适应性较好；对于循环B，当等熵效率超过0.6时，不宜采用Isohexane作为工质，而当等熵效率超过0.95时，R1336mzz(Z)也不宜采用。

Abstract

The use of high-temperature heat pumps to recover industrial waste heat has a high potential for energy conservation. High-temperature heat pumps require high critical temperatures

and the majority of the available working fluids are dry. However

when the dry working fluid is compressed from the saturated vapor phase

the compression process enters the two-phase region

resulting in a risk of liquid slugging that is detrimental to the operation of the compressor and high-temperature heat pump. Two improved vapor injection heat pump cycles (Cycle A and Cycle B) using isohexane

R1336mzz (Z)

and R1233zd (E) as working fluids are proposed. The effects of compressor isentropic efficiency

evaporating temperature

and condensing temperature on the minimum superheating degree and heat pump performance are analyzed. The results indicate that

for cycle B

the evaporation temperature increases from 50 ℃ to 80 ℃. For R1336mzz(Z)

the maximum COP(coefficient of performance) can be increased by 2.56%

and the maximum volumetric heating capacity (VHC) can be increased by 3.18%. For R1233zd(E)

the maximum COP can be increased by 0.44%

and the maximum VHC can be increased by 0.54%. Cycle A has good adaptability to the isentropic efficiency. For cycle B

when the isentropic efficiency is higher than 0.6

isohexane is not suitable as a working fluid. When the isentropic efficiency is higher than 0.95

R1336mzz (Z) is also not suitable.

关键词

高温热泵干工质补气增焓最小过热度

Keywords

high-temperature heat pumpdry working fluidvapor injectionminimum superheating degree

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