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Investigation of defrosting water retention on the surface of evaporator impacting the performance of air source heat pump during periodic frosting–defrosting cycles

Author

Listed:
  • Li, L.T.
  • Wang, W.
  • Sun, Y.Y.
  • Feng, Y.C.
  • Lu, W.P.
  • Zhu, J.H.
  • Ge, Y.J.

Abstract

To investigate the impact of defrosting-water retention on the surface of heat exchangers of the air source heat pump (ASHP) performance during frosting–defrosting cycles, an experimental study has been conducted. Testing was carried out in a controlled-environment chamber with ASHP operational data collected over 16 periodic frosting–defrosting cycles spanning a 360-min period. It was found that the defrosting-water retention undergoes three stages: single-phase water, a mixture of water and ice, followed by a predominance of ice. In this study, the third stage appears after the unit has been in operation for 256min. A “permafrost area” forms on the lower quadrant of the heat exchanger, which occupies over 20% of the total heat exchanger surface. This area remained continuously occupied regardless of whether the unit was in a frosting or defrosting cycle. The appearance of this “permafrost area” not only impacts the performance of the ASHP, it also indicates the beginning of repetitive “shutdown accidents” for the ASHP units. It is the first time that these phenomena, originally caused by the defrosting-water retention have been revealed. And a quantitative analysis is presented for the resulting performance degradation of the ASHP related to the “permafrost area” conditions and the related “repetitive shutdown accidents”.

Suggested Citation

  • Li, L.T. & Wang, W. & Sun, Y.Y. & Feng, Y.C. & Lu, W.P. & Zhu, J.H. & Ge, Y.J., 2014. "Investigation of defrosting water retention on the surface of evaporator impacting the performance of air source heat pump during periodic frosting–defrosting cycles," Applied Energy, Elsevier, vol. 135(C), pages 98-107.
    • Handle: RePEc:eee:appene:v:135:y:2014:i:c:p:98-107
    DOI: 10.1016/j.apenergy.2014.07.028
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    References listed on IDEAS

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    1. Wang, W. & Xiao, J. & Guo, Q.C. & Lu, W.P. & Feng, Y.C., 2011. "Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena," Applied Energy, Elsevier, vol. 88(12), pages 4470-4480.
    2. 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.
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    Cited by:

    1. Song, Mengjie & Gong, Guangcai & Mao, Ning & Deng, Shiming & Wang, Zhihua, 2017. "Experimental investigation on an air source heat pump unit with a three-circuit outdoor coil for its reverse cycle defrosting termination temperature," Applied Energy, Elsevier, vol. 204(C), pages 1388-1398.
    2. Song, Mengjie & Xia, Liang & Deng, Shiming, 2016. "A modeling study on alleviating uneven defrosting for a vertical three-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting," Applied Energy, Elsevier, vol. 161(C), pages 268-278.
    3. Wang, Feng & Liang, Caihua & Zhang, Xiaosong, 2018. "Research of anti-frosting technology in refrigeration and air conditioning fields: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 707-722.
    4. Song, Mengjie & Xia, Liang & Mao, Ning & Deng, Shiming, 2016. "An experimental study on even frosting performance of an air source heat pump unit with a multi-circuit outdoor coil," Applied Energy, Elsevier, vol. 164(C), pages 36-44.
    5. Song, Mengjie & Deng, Shiming & Dang, Chaobin & Mao, Ning & Wang, Zhihua, 2018. "Review on improvement for air source heat pump units during frosting and defrosting," Applied Energy, Elsevier, vol. 211(C), pages 1150-1170.
    6. Song, Mengjie & Deng, Shiming & Mao, Ning & Ye, Xianming, 2016. "An experimental study on defrosting performance for an air source heat pump unit with a horizontally installed multi-circuit outdoor coil," Applied Energy, Elsevier, vol. 165(C), pages 371-382.
    7. Xiuli Liu & Hua Chen & Xiaolin Wang & Gholamreza Kefayati, 2020. "Study on Surface Condensate Water Removal and Heat Transfer Performance of a Minichannel Heat Exchanger," Energies, MDPI, vol. 13(5), pages 1-17, March.

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