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Influence of Heat Exchanger Structure on System Performance in Trans-Critical CO2 Heat Pump Air Conditioning Systems for Trains
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Hongsheng Xie1, Gang Bai2, Mengying Yang1, Yulong Song1, Feng Cao1
Journal of Refrigeration | 2025, 46(4) : 36 - 43
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Journal of Refrigeration | 2025, 46(4): 36-43
Influence of Heat Exchanger Structure on System Performance in Trans-Critical CO2 Heat Pump Air Conditioning Systems for Trains
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Hongsheng Xie1, Gang Bai2, Mengying Yang1, Yulong Song1, Feng Cao1
Affiliations
  • 1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
  • 2.CRRC Dalian Locomotive Research Institute Co., Ltd., Dalian, 116000, China
Published: 2025-08-16 doi: 10.12465/j.issn.0253-4339.2025.04.036
Outline
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To further study the influence of heat exchanger structures on system performance and overall power consumption in transcritical CO2 heat pump air conditioning systems for high-speed trains to improve performance and reduce power consumption, this study builds a numerical simulation model based on the AMEsim simulation platform. The simulation results show that, in the high-speed train heat pump air conditioning system, the influence of the gas cooler structure on system performance is greater than that of the evaporator structure. In terms of the selection of heat exchanger structure, the optimal structure is that during refrigeration, the outdoor heat exchanger adopts the countercurrent arrangement and the indoor heat exchanger adopts the concurrent arrangement (vice versa for heating). At the rated cooling condition of 35 ℃ ambient temperature, the COP is increased by 20.38% compared to the concurrent arrangement in outdoor heat exchangers, and at a rated heating condition of 7 ℃ ambient temperature, the COP is increased by 68.04% compared to the concurrent arrangement of indoor heat exchangers. Considering both the degree of backflow and fan power consumption, in the "fully heat exchange state", system COP increases with backflow degree, while system COP decreases with backflow degree when the air flow rate is insufficient.

transcritical CO2 heat pump air conditioning  /  rail vehicles  /  heat exchanger co-current and counter-current  /  optimal structure
Hongsheng Xie, Gang Bai, Mengying Yang, Yulong Song, Feng Cao. Influence of Heat Exchanger Structure on System Performance in Trans-Critical CO2 Heat Pump Air Conditioning Systems for Trains[J]. Journal of Refrigeration, 2025 , 46 (4) : 36 -43 . DOI: 10.12465/j.issn.0253-4339.2025.04.036
Funding
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  • National Natural Science Foundation of China(52006161)
Appendix
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Year 2025 volume 46 Issue 4
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.04.036
  • Receive Date：2024-03-01
  • Online Date：2026-03-13
  • Published：2025-08-16
Article Data
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History
  • Received：2024-03-01
  • Revised：2024-07-25
  • Accepted：2024-08-01
Funding
National Natural Science Foundation of China(52006161)
Affiliations
    1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
    2.CRRC Dalian Locomotive Research Institute Co., Ltd., Dalian, 116000, China

Corresponding:

Song Yulong, male, associate professor, School of Energy and Power Engineering, Xi'an Jiaotong University, 86-13488264214, E-mail: . Research fields: new energy vehicle heat pump air conditioning and thermal management technology, transcritical CO2 refrigeration and heating technology.
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表12种不同金属材料的力学参数
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Number 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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