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Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena

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  • Wang, W.
  • Xiao, J.
  • Guo, Q.C.
  • Lu, W.P.
  • Feng, Y.C.

Abstract

A study is presented on the characteristics of the air source heat pump (ASHP) under two kinds of typical mal-defrost phenomena. The definition of the “Mal-defrost phenomena” is put forward, and the possible origins of their occurrence are analyzed. It is concluded that the current defrost strategies may cause mal-defrost phenomena due to the lack of the direct control information, frost thickness. Transient characteristics of the tested ASHP under these mal-defrost phenomena are investigated by field tests. Instant frosting images are captured to record the dynamic frosting process. In the first phenomenon of mal-defrost, the defrost control is carried out over an hour after a “critical” level of frosting has been reached. It reduces the COP and heating capacity by about 17.4% and 29%, respectively. In the second phenomenon of mal-defrost, three defrost operations occur while almost no frost is observed on the heat exchanger during 6h testing period. It causes 4.2% decrease for the heating efficiency.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4470-4480
    DOI: 10.1016/j.apenergy.2011.05.047
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    References listed on IDEAS

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    1. Chen, Siliang & Chen, Kang & Zhu, Xu & Jin, Xinqiao & Du, Zhimin, 2022. "Deep learning-based image recognition method for on-demand defrosting control to save energy in commercial energy systems," Applied Energy, Elsevier, vol. 324(C).
    2. Zhengrong Li & Yongheng Du & Yuqin Pan & Fan Zhang & Zhaofeng Meng & Yanan Zhang, 2022. "Experimental Performance Study of Solar-Assisted Enhanced Vapor Injection Air-Source Heat Pump System," Energies, MDPI, vol. 15(20), pages 1-15, October.
    3. O'Hegarty, R. & Kinnane, O. & Lennon, D. & Colclough, S., 2022. "Air-to-water heat pumps: Review and analysis of the performance gap between in-use and product rated performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 155(C).
    4. Kim, Min-Hwan & Lee, Kwan-Soo, 2015. "Determination method of defrosting start-time based on temperature measurements," Applied Energy, Elsevier, vol. 146(C), pages 263-269.
    5. Yang, Seung-Hwan & Rhee, Joong Yong, 2013. "Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating," Applied Energy, Elsevier, vol. 105(C), pages 244-251.
    6. Rafati Nasr, Mohammad & Fauchoux, Melanie & Besant, Robert W. & Simonson, Carey J., 2014. "A review of frosting in air-to-air energy exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 538-554.
    7. Zhang, Lingxi & Good, Nicholas & Mancarella, Pierluigi, 2019. "Building-to-grid flexibility: Modelling and assessment metrics for residential demand response from heat pump aggregations," Applied Energy, Elsevier, vol. 233, pages 709-723.
    8. Wei, Wenzhe & Ni, Long & Li, Shuyi & Wang, Wei & Yao, Yang & Xu, Laifu & Yang, Yahua, 2020. "A new frosting map of variable-frequency air source heat pump in severe cold region considering the variation of heating load," Renewable Energy, Elsevier, vol. 161(C), pages 184-199.
    9. Huang, Wenzhu & Ji, Jie & Xu, Ning & Li, Guiqiang, 2016. "Frosting characteristics and heating performance of a direct-expansion solar-assisted heat pump for space heating under frosting conditions," Applied Energy, Elsevier, vol. 171(C), pages 656-666.
    10. 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.
    11. Amer, Mohammed & Wang, Chi-Chuan, 2017. "Review of defrosting methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 53-74.
    12. Carroll, P. & Chesser, M. & Lyons, P., 2020. "Air Source Heat Pumps field studies: A systematic literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    13. 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.
    14. Wang, Wei & Zhang, Shiqiang & Li, Zhaoyang & Sun, Yuying & Deng, Shiming & Wu, Xu, 2020. "Determination of the optimal defrosting initiating time point for an ASHP unit based on the minimum loss coefficient in the nominal output heating energy," Energy, Elsevier, vol. 191(C).
    15. 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.
    16. Felten, Björn & Weber, Christoph, 2018. "The value(s) of flexible heat pumps – Assessment of technical and economic conditions," Applied Energy, Elsevier, vol. 228(C), pages 1292-1319.
    17. Li, Zhaoyang & Wang, Wei & Sun, Yuying & Wang, Shiquan & Deng, Shiming & Lin, Yao, 2021. "Applying image recognition to frost built-up detection in air source heat pumps," Energy, Elsevier, vol. 233(C).

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