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Rational assessment and selection of air source heat pump system operating with CO2 and R407C for electric bus

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  • Wang, Haidan
  • Song, Yulong
  • Qiao, Yiyou
  • Li, Shengbo
  • Cao, Feng

Abstract

Heat pump technology has gained surging interests due to its abilities in reducing the battery burden of the electric bus. Here, three heat pump systems for an 8 m bus are compared, including a R407C system, a basic transcritical CO2 system (CO2-BASE), and a transcritical CO2 system with an expansion-compression integrated machine (CO2-Advanced). The results demonstrate that the optimal ratio of the theoretical volume of the expander to the compressor in expander-compressor machine can improve the coefficient of performance (COP) of the CO2-BASE system in all cooling conditions, with a range of 0.165–0.190. The COP of the CO2-Advanced system has 13.59% improvement than that of the R407C system at most in cooling mode. In addition, the performances of the three systems run in five typical climates in China are compared. The comparison result shows that the CO2-BASE system is more suitable for Severe Cold Zone and Mild Zone, and the R407C system performs better in Hot summer and Warm winter Zone. However, the CO2-Advanced system, which has the best energy-saving effect in all climate zones in China, has a great potential to replace the existing R407C system for electric buses.

Suggested Citation

  • Wang, Haidan & Song, Yulong & Qiao, Yiyou & Li, Shengbo & Cao, Feng, 2022. "Rational assessment and selection of air source heat pump system operating with CO2 and R407C for electric bus," Renewable Energy, Elsevier, vol. 182(C), pages 86-101.
    • Handle: RePEc:eee:renene:v:182:y:2022:i:c:p:86-101
    DOI: 10.1016/j.renene.2021.10.009
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    References listed on IDEAS

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    1. Jia, Fan & Yin, Xiang & Cao, Feng & Fang, Jianmin & Wang, Anci & Wang, Xixi & Yang, Lichen, 2024. "A novel control method for the automotive CO2 heat pumps under inappropriate refrigerant charge conditions," Energy, Elsevier, vol. 286(C).

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