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Comparative Study on the Main Performance Improvement Methods of Transcritical CO2 Heat Pump Air-Conditioning System for New Energy Vehicles
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Mengying Yang1, Jingwen Ding2, Hongsheng Xie1, Yulong Song1, Feng Cao1, Xiangyang Dai3
Journal of Refrigeration | 2025, 46(2) : 28 - 37
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Journal of Refrigeration | 2025, 46(2): 28-37
Comparative Study on the Main Performance Improvement Methods of Transcritical CO2 Heat Pump Air-Conditioning System for New Energy Vehicles
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Mengying Yang1, Jingwen Ding2, Hongsheng Xie1, Yulong Song1, Feng Cao1, Xiangyang Dai3
Affiliations
  • 1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
  • 2.China Automotive Technology & Research Center Co., Ltd., Tianjin, 300300, China
  • 3.Shenzhen Envicool Technology Co., Ltd., Shenzhen, 518110, China
Published: 2025-04-16 doi: 10.12465/j.issn.0253-4339.2025.02.028
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Transcritical CO2 heat pump air-conditioning systems have gained prominence in new energy vehicle thermal management due to their energy-saving and environmentally friendly characteristics. However, the relatively low coefficient of performance (COP) in cooling mode remains a significant obstacle to developing transcritical CO2 heat pump air conditioning systems. To enhance system performance, five technical approaches are proposed: internal heat exchangers (IHX), expanders, vortex tubes, ejectors, and combined multiple evaporation steps with vapor injection. The performances of these methods were evaluated through one-dimensional theoretical calculations under vehicle operating conditions. Results indicate that optimizing discharge pressure is critical for all methods, with varying degrees of COP improvement. Expanders provide the most comprehensive benefits, ejectors perform well under specific design conditions, IHX shows notable enhancements in cooling mode, and vortex tubes and combined multiple evaporation steps with vapor injection exhibit broad adaptability across working conditions. These findings offer valuable insights for practical engineering applications and support the adoption of transcritical CO2 heat pump systems in new energy vehicles.

Mengying Yang, Jingwen Ding, Hongsheng Xie, Yulong Song, Feng Cao, Xiangyang Dai. Comparative Study on the Main Performance Improvement Methods of Transcritical CO2 Heat Pump Air-Conditioning System for New Energy Vehicles[J]. Journal of Refrigeration, 2025 , 46 (2) : 28 -37 . DOI: 10.12465/j.issn.0253-4339.2025.02.028
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.02.028
  • Receive Date：2023-11-11
  • Online Date：2026-03-13
  • Published：2025-04-16
Article Data
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History
  • Received：2023-11-11
  • Revised：2023-12-14
  • Accepted：2024-01-29
Affiliations
    1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
    2.China Automotive Technology & Research Center Co., Ltd., Tianjin, 300300, China
    3.Shenzhen Envicool Technology Co., Ltd., Shenzhen, 518110, China

Corresponding:

Song Yulong, male, associate professor, School of Energy and Power Engineering, Xi'an Jiaotong University, 86-13488264214, E-mail: . Research fields: novel applications of the transcritical CO2 technology.
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https://castjournals.cast.org.cn/joweb/zlxb/EN/10.12465/j.issn.0253-4339.2025.02.028
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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