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A semi-empirical modeling study on the defrosting performance for an air source heat pump unit with local drainage of melted frost from its three-circuit outdoor coil

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  • Song, Mengjie
  • Deng, Shiming
  • Xia, Liang

Abstract

Reverse cycle defrosting is the most widely used standard defrosting method for air source heat pump (ASHP) units. It was suggested in previous experimental studies that during reverse cycle defrosting, downwards flowing of the melted frost due to gravity over a vertically installed multi-circuit outdoor coil in an ASHP unit has negative effects on defrosting performance. Therefore, an experimental study on draining away locally the melted frost for an experimental ASHP unit having three refrigerant circuits using water collecting trays was carried out and the study results were separately reported. To enable further quantitative analysis on the effects of local draining away the melted frost on reverse cycle defrosting performance of the ASHP unit, a modeling study on the defrosting process, at the two experimental settings of with and without the use of water collecting trays between circuits was carried out and is reported in this paper. Two semi-empirical mathematical models, corresponding to the two settings, were developed. In this paper, firstly the detailed development of the two semi-empirical models is presented. This is followed by reporting the validations of the two models using the experimental data previously reported. Finally, detailed discussions on the potential uses of the two models developed and the limitations of the modeling work reported are included.

Suggested Citation

  • Song, Mengjie & Deng, Shiming & Xia, Liang, 2014. "A semi-empirical modeling study on the defrosting performance for an air source heat pump unit with local drainage of melted frost from its three-circuit outdoor coil," Applied Energy, Elsevier, vol. 136(C), pages 537-547.
    • Handle: RePEc:eee:appene:v:136:y:2014:i:c:p:537-547
    DOI: 10.1016/j.apenergy.2014.09.012
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    References listed on IDEAS

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    1. Qu, Minglu & Pan, Dongmei & 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 II: Modeling analysis," Applied Energy, Elsevier, vol. 91(1), pages 274-280.
    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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    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. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    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. Wang, Chenguang & Gong, Guangcai & Su, Huan & Wah Yu, Chuck, 2015. "Efficacy of integrated photovoltaics-air source heat pump systems for application in Central-south China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 1190-1197.
    7. Han, Binglong & Xiong, Tong & Xu, Shijie & Liu, Guoqiang & Yan, Gang, 2022. "Parametric study of a room air conditioner during defrosting cycle based on a modified defrosting model," Energy, Elsevier, vol. 238(PA).
    8. 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.
    9. Song, Mengjie & Xu, Xiangguo & Mao, Ning & Deng, Shiming & Xu, Yingjie, 2017. "Energy transfer procession in an air source heat pump unit during defrosting," Applied Energy, Elsevier, vol. 204(C), pages 679-689.

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