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Enhancing Heating Performance of Low-Temperature Air Source Heat Pumps Using Compressor Casing Thermal Storage

Author

Listed:
  • Zhongbao Liu

    (Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan Road, Chaoyang, Beijing 100124, China)

  • Fengfei Lou

    (Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan Road, Chaoyang, Beijing 100124, China)

  • Xin Qi

    (China Household Electric Appliance Research Institute, 6 Yuetan beixiao Str, Xicheng, Beijing 100037, China)

  • Yiyao Shen

    (Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China)

Abstract

Air source heat pumps (ASHPs) are widely recognized as energy-saving and environmentally friendly heating and air-conditioning equipment with broad applications. However, when conventional ASHPs are operated at a low ambient temperature, they suffer from problems such as high discharge temperature and low heating efficiency. To address these problems, this study designed a new type of dual evaporator combined with a compressor casing thermal storage heat pump system (DE-CCTS) on the basis of a low-temperature air source heat pump water heater with enhanced vapor injection (EVI). The proposed DE-CCTS used thermal storage phase change material (PCM), which was filled in the secondary evaporator (the thermal storage heat exchanger), to recover the waste heat of the compressor casing. Unlike that in the original system under different ambient temperatures, the suction temperature increased by 0.1–1 °C, the discharge temperature decreased by 0.1–0.5 °C, and the coefficient of performance (COP) of DE-CCTS increased by 0.85–4.72% under the proposed system. These effects were especially evident at low temperatures.

Suggested Citation

  • Zhongbao Liu & Fengfei Lou & Xin Qi & Yiyao Shen, 2020. "Enhancing Heating Performance of Low-Temperature Air Source Heat Pumps Using Compressor Casing Thermal Storage," Energies, MDPI, vol. 13(12), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3269-:d:375784
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    References listed on IDEAS

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    1. Zhang, Long & Jiang, Yiqiang & Dong, Jiankai & Yao, Yang, 2018. "Advances in vapor compression air source heat pump system in cold regions: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 353-365.
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    Cited by:

    1. Rendall, Joseph & Elatar, Ahmed & Nawaz, Kashif & Sun, Jian, 2023. "Medium-temperature phase change material integration in domestic heat pump water heaters for improved thermal energy storage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).
    2. Jiefeng Liu & Shangxin Yu & Shichang Yang & Yiyi Zhang & Xianhao Fan & Bing Gao, 2020. "Numerical Studies on the Performance of the PCM Mesh-Finned Heat Sink Base on Thermal-Flow Multiphysics Coupling Simulation," Energies, MDPI, vol. 13(18), pages 1-17, September.
    3. Win Jet Luo & Kun Ying Li & Jeng Min Huang & Chong Kai Yu, 2020. "Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump," Energies, MDPI, vol. 13(18), pages 1-25, September.

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