The Effects of R1234ze(E) Replacing R134a on the Two-Stage Compression Cycle Centrifugal Compressor and Refrigeration Performance

LIU dan; XI Guang; DUAN Yafei; CHEN Han; WANG Zhiheng; LI Zhenshan; LIU Zhiyuan

doi:10.7652/xjtuxb202509014

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The Effects of R1234ze(E) Replacing R134a on the Two-Stage Compression Cycle Centrifugal Compressor and Refrigeration Performance

更新时间：2025-09-11

- The Effects of R1234ze(E) Replacing R134a on the Two-Stage Compression Cycle Centrifugal Compressor and Refrigeration Performance
- Journal of Xi’an Jiaotong University Vol. 59, Issue 9, Pages: 142-151(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.重庆美的通用制冷设备有限公司， 401336，重庆
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202509014
  CLC： TB652;O354
- Received：05 March 2025，
  
  Online First：13 May 2025，
  
  Published：10 September 2025
- 稿件说明：
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LIU dan, XI Guang, DUAN Yafei, et al. The Effects of R1234ze(E) Replacing R134a on the Two-Stage Compression Cycle Centrifugal Compressor and Refrigeration Performance[J]. Journal of Xi’an Jiaotong University, 2025, 59(9): 142-151.
DOI：

LIU dan, XI Guang, DUAN Yafei, et al. The Effects of R1234ze(E) Replacing R134a on the Two-Stage Compression Cycle Centrifugal Compressor and Refrigeration Performance[J]. Journal of Xi’an Jiaotong University, 2025, 59(9): 142-151. DOI： 10.7652/xjtuxb202509014.

摘要

为研究制冷剂R1234ze（E）替代R134a后离心压缩机及制冷性能的变化，基于两次节流中间不完全冷却的两级蒸汽压缩制冷循环（VCS-TS-FT），建立制冷循环数学模型及两级串联离心压缩机流动模型，详细分析了R1234ze（E）替代R134a对压缩机及制冷性能的影响。数值计算结果表明：R1234ze（E）替代R134a，在相同冷凝温度条件下，转速不变时，制冷量为R134a的83.7%，压缩机压比较R134a高2%，效率基本不变，排气温度低0.5%，压缩机轴功率低11.6%，制冷性能系数（

cop

）由6.83下降至6.59。通过改变压缩机的转速，压缩机及制冷循环性能发生显著改变，转速提升7%，R1234ze（E）制冷量与R134a设计转速下设计制冷量相同，但压缩机效率下降5.9%，系统

cop

下降至6.15；相反，转速降低3.4%，压缩机容积流量不变，R1234ze（E）制冷量降低为R134a设计转速下设计制冷量的76%，系统

cop

上升至6.87。因此，在不重新设计压缩机的条件下，R1234ze（E）直接替代R134a无法达到

cop

和制冷量同时与R134a相等的水平。另外，为实现相同制冷量，也需对冷凝器和蒸发器进行改进。

Abstract

To investigate the changes in the performance of centrifugal compressors and refrigeration efficiency after the replacement of refrigerant R134a with R1234ze(E)

this study establishes a mathematical model of the refrigeration cycle and a flow model of a two-stage series centrifugal compressor based on a two-stage vapor compression refrigeration cycle with incomplete cooling between two throttling processes (VCS-TS-FT). The influence of the replacement of R134a with R1234ze(E) on compressor and system performance is analyzed in detail. Numerical results show that

after replacing R134a

under the same condensing temperature and unchanged rotational speed

R1234ze(E) achieves 83.7% of R134a's cooling capacity

with a 2% higher pressure ratio

nearly unchanged efficiency

0.5% lower discharge temperature

11.6% lower shaft power

and a decrease in coefficient of performance (

cop

) from 6.83 to 6.59. Adjusting the compressor speed significantly alters the performance of the compressor and refrigeration cycle. A 7% increase in speed results in a refrigeration capacity of R1234ze(E) equal to that of R134a at the designed speed

but the compressor efficiency decreases by 5.9%

and the system

cop

drops to 6.15. Conversely

a 3.4% decrease in speed with unchanged compressor volumetric flow results in the refrigeration capacity of R1234ze(E) being reduced to 76% of that of R134a at the designed speed

while the system

cop

rises to 6.87. Therefore

the direct replacement of R134a with R1234ze(E) without redesigning the compressor cannot achieve equivalent levels of both

cop

and refrige

ration capacity compared to R134a. Additionally

improvements to the condenser and evaporator are required to achieve the same refrigeration capacity.

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Keywords

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