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Defrost improvement by heat pump refrigerant charge compensating

Author

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  • Zhiyi, Wang
  • Xinmin, Wang
  • Zhiming, Dong

Abstract

During winters, the air-source heat pump often operates with substantial frost formation on the outdoor heat exchanger, and the frost layer has to be melted away periodically to keep a high heat pump coefficient of performance (COP). Otherwise, the unmelted frost layer and water will become high density frost or ice layer in heating mode. However, it is difficult to melt the frost layer in the defrosting cycle, where the effective defrosting time plays an important role in improving the defrosting ability. Generally, the defrosting time can be decreased by the following ways: increasing the refrigerant flow rate effectively, and rapidly establishing the suction pressure, discharge pressure, and the compressor power. A new heat pump defrost system with a refrigerant charge compensator, instead of the accumulator which is a key component for the frosting cycle performance, is developed in this paper. Furthermore, test results showed that the improved frost system with the compensator worked as expected, and its suction and discharge pressures and the power of the compressor during the defrosting were much larger than before.

Suggested Citation

  • Zhiyi, Wang & Xinmin, Wang & Zhiming, Dong, 2008. "Defrost improvement by heat pump refrigerant charge compensating," Applied Energy, Elsevier, vol. 85(11), pages 1050-1059, November.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:11:p:1050-1059
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    References listed on IDEAS

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    1. Tassou, S.A. & Marquand, C.J., 1987. "Effects of evaporator frosting and defrosting on the performance of air-to-water heat pumps," Applied Energy, Elsevier, vol. 28(1), pages 19-33.
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    Cited by:

    1. Xu, Jiamin & Zhang, Caizhi & Wan, Zhongmin & Chen, Xi & Chan, Siew Hwa & Tu, Zhengkai, 2022. "Progress and perspectives of integrated thermal management systems in PEM fuel cell vehicles: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 155(C).
    2. Huang, Dong & Li, Quanxu & Yuan, Xiuling, 2009. "Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump," Applied Energy, Elsevier, vol. 86(9), pages 1697-1703, September.
    3. Jang, Ji Young & Bae, Heung Hee & Lee, Seung Jun & Ha, Man Yeong, 2013. "Continuous heating of an air-source heat pump during defrosting and improvement of energy efficiency," Applied Energy, Elsevier, vol. 110(C), pages 9-16.
    4. Qu, Minglu & Xia, Liang & Deng, Shiming & Jiang, Yiqiang, 2012. "A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments," Applied Energy, Elsevier, vol. 91(1), pages 122-129.
    5. Wang, W. & Feng, Y.C. & Zhu, J.H. & Li, L.T. & Guo, Q.C. & Lu, W.P., 2013. "Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions," Applied Energy, Elsevier, vol. 112(C), pages 1138-1145.
    6. Konrad, Mary Elizabeth & MacDonald, Brendan D., 2023. "Cold climate air source heat pumps: Industry progress and thermodynamic analysis of market-available residential units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).

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    1. Jang, Ji Young & Bae, Heung Hee & Lee, Seung Jun & Ha, Man Yeong, 2013. "Continuous heating of an air-source heat pump during defrosting and improvement of energy efficiency," Applied Energy, Elsevier, vol. 110(C), pages 9-16.
    2. Qu, Minglu & Xia, Liang & Deng, Shiming & Jiang, Yiqiang, 2012. "A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments," Applied Energy, Elsevier, vol. 91(1), pages 122-129.

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