Experimental Study on a Transcritical CO<sub>2</sub> Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid

Dai Baomin Miao Ronghua Zhao Weiqi Liu Chenghao Han Jilei Wang Yu; Zhang Tong Liu Shengchun

doi:10.12465/issn.0253-4339.20251103003

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Experimental Study on a Transcritical CO₂ Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid

更新时间：2026-05-06

- Experimental Study on a Transcritical CO₂ Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid
- Journal of Refrigeration Pages: 1-8(2026)
- 作者机构：
  
  天津商业大学天津市制冷技术重点实验室天津 300134
- 作者简介：
- 基金信息：
  
  the National Natural Science Foundation of China(52576017;52476085)
- DOI：10.12465/issn.0253-4339.20251103003
  CLC： TB657.2;TQ051.5
- Received：03 November 2025，
  
  Revised：2025-11-26，
  
  Accepted：01 December 2025，
  
  Online First：06 May 2026，
- 稿件说明：
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代宝民,苗荣华,赵未淇等.采用R290机械过冷的跨临界CO₂热泵系统实验研究[J].制冷学报,

Dai Baomin Miao Ronghua Zhao Weiqi Liu Chenghao Han Jilei Wang Yu,Zhang Tong Liu Shengchun.Experimental Study on a Transcritical CO₂ Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid[J].Journal of Refrigeration,
代宝民,苗荣华,赵未淇等.采用R290机械过冷的跨临界CO₂热泵系统实验研究[J].制冷学报, DOI：10.12465/issn.0253-4339.20251103003.

Dai Baomin Miao Ronghua Zhao Weiqi Liu Chenghao Han Jilei Wang Yu,Zhang Tong Liu Shengchun.Experimental Study on a Transcritical CO₂ Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid[J].Journal of Refrigeration, DOI：10.12465/issn.0253-4339.20251103003.

摘要

搭建了R290机械过冷跨临界CO

热泵系统（DMS）的实验测试装置，并对其与常规CO

热泵系统（Base）进行了实验研究及对比分析。结果表明，系统存在最优排气压力和最优过冷度。在蒸发温度为5 ℃，供回水为50/30 ℃工况下，最大COP为3.89，最优排气压力和过冷度分别为8.4 MPa和17.3 ℃。随着供回水温度的升高，DMS和Base系统最大COP均呈逐渐降低趋势，DMS系统相对Base系统的COP提升率逐步增大，对应的最优排气压力也逐步增大。DMS系统的COP高于Base系统，最优排气压力低于Base系统。当供回水温度从50/30 ℃升至58/38 ℃时，COP提升率从9.6%提高至16.7%，R290压缩机与CO

压缩机的功耗比呈现近似增加的趋势，由21.0%提高至27.7%。本研究可为CO

热泵系统的能效提升提供实验参考。

Abstract

An experimental setup that uses R290 as the working fluid for the dedicated mechanical subcooling of a transcritical CO₂ heat pump system （DMS） was developed and evaluated in this study. The results were compared with those of the conventional baseline C

heat pump system （base）. The results revealed that there is an optimal discharge pressure and subcooling degree for the system. Under the operating conditions of an evaporation temperature of 5 ℃ and supply/return water temperature of 50/30 ℃， the DMS system achieved the maximum coefficient of performance（COP） of 3.89， with the corresponding optimal discharge pressure and subcooling degree being 8.4 MPa and 17.3 ℃， respectively. With an increase in the supply/return water temperature， the maximum COP values of both the DMS and base systems exhibited a gradually decreasing trend. Further， the relative COP improvement rate of the DMS system with respect to the base system increased progressively， and the corresponding optimal discharge pressure increased gradually for both systems. The COP of the DMS system remained consistently higher than that of the base system， whereas the optimal discharge pressure was consistently lower than that of the base system. As the supply/return water temperature was increased from 50/30 ℃ to 58/38 ℃， the COP improvement rate increased from 9.6% to 16.7%. Additionally， the power consumption ratio of the R290 compressor to that of the CO

compressor exhibited an increasing trend， rising from 21.0% to 27.7%. This study provides an experimental reference for enhancing the energy efficiency of CO

heat pump systems.

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references

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Related Institution

Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce

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Experimental Study on a Transcritical CO2 Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid

DOI：10.12465/issn.0253-4339.20251103003

摘要

Abstract

关键词

Keywords

references

Experimental Study on a Transcritical CO₂ Heat Pump System Integrated with Mechanical Subcooling Using R290 as the Working Fluid