Performance of Low-temperature Two-stage Transcritical CO<sub>2</sub> Compression Refrigeration System with Ejector

Fu Bing; Zhang Liang; Ye Fangping; Jiao Xingrong; Yang Yuqi

doi:10.3969/j.issn.0253-4339.2024.04.124

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Performance of Low-temperature Two-stage Transcritical CO₂ Compression Refrigeration System with Ejector

更新时间：2024-09-02

- Performance of Low-temperature Two-stage Transcritical CO₂ Compression Refrigeration System with Ejector
- Journal of Refrigeration Vol. 45, Issue 4, Pages: 124-130(2024)
- 作者机构：
  
  1..上海理工大学能源与动力工程学院　上海　 200093
  2..浙江新劲空调设备有限公司　龙泉　 323700
- 作者简介：
  
  Zhang Liang, male, associate professor, School of Energy and Power Engineering, University of Shanghai for Science and Technology, 86-13816670326, E-mail: L_zhanghk@163.com. Research fields: air conditioning, heat exchange performance of refrigeration system equipment, cryogenic refrigeration.
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2024.04.124
  CLC： TB61⁺1;TB61⁺7
- Received：11 April 2023，
  
  Revised：2023-08-24，
  
  Accepted：11 September 2023，
  
  Published：16 August 2024
- 稿件说明：
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Fu Bing, Zhang Liang, Ye Fangping, et al. Performance of Low-temperature Two-stage Transcritical CO₂ Compression Refrigeration System with Ejector[J]. Journal of Refrigeration, 2024, 45(4): 124-130.
DOI：

Fu Bing, Zhang Liang, Ye Fangping, et al. Performance of Low-temperature Two-stage Transcritical CO₂ Compression Refrigeration System with Ejector[J]. Journal of Refrigeration, 2024, 45(4): 124-130. DOI： 10.3969/j.issn.0253-4339.2024.04.124.

摘要

针对低蒸发温度下跨临界CO

制冷系统实验研究较少的现状，设计搭建了带喷射器的跨临界CO

两级压缩制冷实验台，在蒸发温度为-33~-29 ℃，气冷器出口温度为30~40 ℃，高压压力为8.20~9.70 MPa的实验工况下研究制冷系统的性能变化，并将实验结果与理论计算结果进行对比。研究结果表明：实验结果与理论热力学计算结果变化趋势一致，喷射器的应用可显著提升跨临界CO

两级压缩制冷系统的性能，其对制冷系统COP的最大提升率可达29.37%；在实验工况下，带喷射器的跨临界CO

两级压缩制冷系统的最优高压压力为8.80 MPa，对应的最优COP为1.63；带喷射器的跨临界CO

两级压缩制冷系统的制冷量和COP随蒸发温度的升高而增大；气冷器出口温度对制冷系统的性能影响显著，随着气冷器出口温度从30 ℃升至40 ℃，制冷系统的COP降低61.4%。这些研究成果可为带喷射器的跨临界CO

两级压缩制冷系统的研究提供参考。

Abstract

Because of the limited experimental studies on transcritical CO

refrigeration systems at low evaporating temperatures

an experimental platform of a two-stage transcritical CO

compression refrigeration system with an ejector was designed and built. We evaluated the performance of the proposed refrigeration system under the following experimental conditions: evaporating temperature within the range of -33 ℃--29 ℃

gas cooler outlet temperature of 30 ℃-40 ℃

and high pressure of 8.20 MPa-9.70 MPa. The results show that th

e variation trend of the experimental results is consistent with that of the theoretical thermodynamic calculation results

and the application of the ejector can significantly improve the performance of the two-stage transcritical CO

compression refrigeration system. The maximum increase rate of the coefficient of performance (COP) of the refrigeration system by the ejector is 29.37%. Under experimental conditions

the optimal high pressure of the two-stage transcritical CO

compression refrigeration system with an ejector is 8.80 MPa

and the corresponding optimal COP is 1.63. The cooling capacity and COP of the two-stage transcritical CO

compression refrigeration system with an ejector increase with increasing evaporating temperature

and the gas cooler outlet temperature significantly affected the performance of the refrigeration system. As the gas cooler outlet temperature increases from 30 ℃ to 40 ℃

the COP of the refrigeration system decreases by 61.4%. The research results provide a reference for research on two-stage transcritical CO

compression refrigeration systems with ejectors.

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Performance of Low-temperature Two-stage Transcritical CO2 Compression Refrigeration System with Ejector

DOI：10.3969/j.issn.0253-4339.2024.04.124

摘要

Abstract

关键词

Keywords

references

Performance of Low-temperature Two-stage Transcritical CO₂ Compression Refrigeration System with Ejector