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Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions

Author

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  • Wang, W.
  • Feng, Y.C.
  • Zhu, J.H.
  • Li, L.T.
  • Guo, Q.C.
  • Lu, W.P.

Abstract

To quantify the performance drop of the air source heat pump (ASHP) system under a special kind of mal-defrost phenomenon appearing in moderate climate conditions, a field test was conducted for 8days at the initial stage of a heating season in Beijing, China. The mal-defrost was found with the more than 60% frosted area of the outdoor heat exchanger after the system running 5days. During this frosting period, the system COP was significantly degraded, only 2.3 under an environment temperature of 7.9°C. Comparing the test data before and after frosting, it was found that the mal-defrost decreased the COP up to 40.4% and the heating capacity to 43.4%. Such low energy efficiency continued quite a long time until the defrost control was started up manually by the authors. After defrosting, the COP reclaimed to the normal level of 5.0. The origins of this special mal-defrost phenomenon were discussed. And some suggestions were proposed to modify the current defrosting control strategy, which were helpful to avoid the mal-defrost problem in the current ASHP system and therefore improve the system performances.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:112:y:2013:i:c:p:1138-1145
    DOI: 10.1016/j.apenergy.2012.12.054
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    References listed on IDEAS

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