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High-efficiency cooling solution for exhaust air heat pump: Modeling and experimental validation

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  • Li, Wuyan
  • Wang, Jue
  • Shi, Wenxing
  • Lu, Jun

Abstract

The cooling performance of exhaust air heat pumps is limited by the high condensing temperatures owing to insufficient exhaust air volume. In this study, a high-efficiency solution for an exhaust air heat pump was developed and numerically studied. In this novel system, the exhaust air is stepped energy recovered by an indirect evaporative cooler and a heat pump with an evaporative condenser. It is considered that the combination of these two heat transfer components can provide a system with a significantly high cooling efficiency. To explore the application potential of this system further, a detailed mathematical model was established. Meanwhile, a prototype based on this design was developed, and its performance in four operating modes was tested for model validation. When the test results are compared with those of a conventional system of the same size, they show that the cooling capacity and energy efficiency ratio of the novel system increased by 53% and 135%, respectively. Subsequently, to clarify the principles underlying the design of this system, parameter sensitivity analysis and system matching optimization were conducted numerically.

Suggested Citation

  • Li, Wuyan & Wang, Jue & Shi, Wenxing & Lu, Jun, 2022. "High-efficiency cooling solution for exhaust air heat pump: Modeling and experimental validation," Energy, Elsevier, vol. 254(PB).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pb:s0360544222012993
    DOI: 10.1016/j.energy.2022.124396
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    References listed on IDEAS

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    1. Li, Wuyan & Li, Yongcai & Shi, Wenxing & Lu, Jun, 2021. "Energy and exergy study on indirect evaporative cooler used in exhaust air heat recovery," Energy, Elsevier, vol. 235(C).
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    6. Chen, Yi & Yang, Hongxing & Luo, Yimo, 2017. "Parameter sensitivity analysis and configuration optimization of indirect evaporative cooler (IEC) considering condensation," Applied Energy, Elsevier, vol. 194(C), pages 440-453.
    7. Liang, Cai-Hang & Zhang, Li-Zhi & Pei, Li-Xia, 2010. "Performance analysis of a direct expansion air dehumidification system combined with membrane-based total heat recovery," Energy, Elsevier, vol. 35(9), pages 3891-3901.
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    Cited by:

    1. Song, Zhiying & Ji, Jie & Zhang, Yuzhe & Cai, Jingyong, 2023. "Numerical exploration and experimental validation of a tri-generation heat pump system in cooling mode," Energy, Elsevier, vol. 273(C).
    2. Li, Wuyan & Li, Xianting & Gao, Yijun & Shi, Wenxing, 2022. "Thermo-economic evaluation for energy retrofitting building ventilation system based on run-around heat recovery system," Energy, Elsevier, vol. 260(C).

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