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Ejector optimization and performance analysis of electric vehicle CO2 heat pump with dual ejectors

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  • Zou, Huiming
  • Yang, Tianyang
  • Tang, Mingsheng
  • Tian, Changqing
  • Butrymowicz, Dariusz

Abstract

The performance of fixed ejector is limited by working conditions, so it is difficult to meet the operating requirements of electric vehicle heat pump system under varying conditions and wide temperature range. In this paper, a transcritical CO2 refrigeration cycle with dual ejectors in parallel (DEP) for electric vehicle heat pump system is established and its operation condition weight statistics method in all climate is proposed. On this basis, a fixed ejector optimization method based on the genetic algorithm is proposed, which takes the increment of integrated part load value (ΔIPLV) compared to the conventional transcritical CO2 refrigeration cycle (CON) system as the evaluation index. The performance analysis results show that under the cooling conditions, the coefficient of performance (COP) of DEP system with the optimized ejector for cooling is increased by 17.32%–23.42% compared to the CON system, and the COP of the transcritical CO2 refrigeration cycle with a single ejector (SEJ) system is increased by 7.31%–9.47%. In the heating mode, the COP of DEP system with the optimized ejector for heating is increased by 18%–19.79%, while the COP of SEJ system with the unoptimized ejector is decreased by 0.07%–2.43%.

Suggested Citation

  • Zou, Huiming & Yang, Tianyang & Tang, Mingsheng & Tian, Changqing & Butrymowicz, Dariusz, 2022. "Ejector optimization and performance analysis of electric vehicle CO2 heat pump with dual ejectors," Energy, Elsevier, vol. 239(PE).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pe:s0360544221027018
    DOI: 10.1016/j.energy.2021.122452
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    References listed on IDEAS

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    Cited by:

    1. Lixing Zheng & Yiyan Zhang & Lifen Hao & Haojie Lian & Jianqiang Deng & Wei Lu, 2022. "Modelling, Optimization, and Experimental Studies of Refrigeration CO 2 Ejectors: A Review," Mathematics, MDPI, vol. 10(22), pages 1-23, November.
    2. Jiang, Ziqi & Tian, Yafen & Li, Kang & Zhao, Zhaorui & Liu, Ni & Zhang, Hua, 2024. "Research on refrigerant charge determination under different compressor speed and its effects on the performance of transcritical CO2 air-conditioning heat pump system in electric vehicle," Energy, Elsevier, vol. 296(C).
    3. Sven Gruber & Klemen Rola & Danijela Urbancl & Darko Goričanec, 2024. "Recent Advances in Ejector-Enhanced Vapor Compression Heat Pump and Refrigeration Systems—A Review," Energies, MDPI, vol. 17(16), pages 1-50, August.
    4. Hongzeng Ji & Jinchen Pei & Jingyang Cai & Chen Ding & Fen Guo & Yichun Wang, 2023. "Review of Recent Advances in Transcritical CO 2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field," Energies, MDPI, vol. 16(10), pages 1-21, May.
    5. Yu, Binbin & Long, Junan & Zhang, Yingjing & Ouyang, Hongsheng & Wang, Dandong & Shi, Junye & Chen, Jiangping, 2024. "Life cycle climate performance evaluation (LCCP) of electric vehicle heat pumps using low-GWP refrigerants towards China's carbon neutrality," Applied Energy, Elsevier, vol. 353(PA).

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    Keywords

    CO2; Ejector optimization; Electric vehicle; Heat pump;
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