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A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments

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  • Qu, Minglu
  • Xia, Liang
  • Deng, Shiming
  • Jiang, Yiqiang

Abstract

When an air source heat pump (ASHP) unit operates in heating mode, frost can be accumulated on the surface of its finned outdoor coil which normally has multiple parallel circuits on its refrigerant side for minimized refrigerant pressure loss and enhanced heat transfer efficiency. On its airside, however, there is usually no segmentation corresponding to the number of refrigerant circuit. Frosting deteriorates the operation and energy efficiency of the ASHP unit and periodic defrosting becomes necessary. Currently the most widely used standard defrosting method for ASHPs is reverse cycle defrost. This paper, the first part of a two-part series, reports on the experimental part of a study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an experimental 6.5kW heating capacity residential ASHP unit. Firstly the experimental ASHP unit is described and experimental procedures detailed. Secondly, the experimental results are reported. This is followed by the discussion on the effects of downwards flowing of the melted frost along a multi-circuit outdoor coil surface on defrosting performance. Finally, the evaluation of the defrosting efficiency for the experimental ASHP unit is provided. In the second part of the series, a modeling analysis on the effects of downwards flowing of the melted frost along the multi-circuit outdoor coil surface on defrosting performance of the experimental ASHP unit will be presented.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:91:y:2012:i:1:p:122-129
    DOI: 10.1016/j.apenergy.2011.08.034
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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.
    2. Choi, Hwan-Jong & Kim, Byung-Soon & Kang, Donghoon & Kim, Kyung Chun, 2011. "Defrosting method adopting dual hot gas bypass for an air-to-air heat pump," Applied Energy, Elsevier, vol. 88(12), pages 4544-4555.
    3. 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.
    Full references (including those not matched with items on IDEAS)

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    Cited by:

    1. Sheng, Wei & Liu, Pengpeng & Dang, Chaobin & Liu, Guixin, 2017. "Review of restraint frost method on cold surface," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 806-813.
    2. 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.
    3. Ma, Jiacheng & Kim, Donghun & Braun, James E. & Horton, W. Travis, 2023. "Development and validation of a dynamic modeling framework for air-source heat pumps under cycling of frosting and reverse-cycle defrosting," Energy, Elsevier, vol. 272(C).
    4. 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.
    5. 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.
    6. Long, Zhang & Jiankai, Dong & Yiqiang, Jiang & Yang, Yao, 2014. "A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump," Applied Energy, Elsevier, vol. 133(C), pages 101-111.
    7. Minglu, Qu & Rao, Zhang & Jianbo, Chen & Yuanda, Cheng & Xudong, Zhao & Tongyao, Zhang & Zhao, Li, 2020. "Experimental analysis of heat coupling during TES based reverse cycle defrosting method for cascade air source heat pumps," Renewable Energy, Elsevier, vol. 147(P1), pages 35-42.
    8. 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.
    9. 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.
    10. Yang, Bowen & Dong, Jiankai & Zhang, Long & Song, Mengjie & Jiang, Yiqiang & Deng, Shiming, 2019. "Heating and energy storage characteristics of multi-split air source heat pump based on energy storage defrosting," Applied Energy, Elsevier, vol. 238(C), pages 303-310.
    11. Song, Mengjie & Pan, Dongmei & Li, Ning & Deng, Shiming, 2015. "An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting," Applied Energy, Elsevier, vol. 138(C), pages 598-604.
    12. 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).
    13. Haihui Tan & Xiaofeng Zhang & Li Zhang & Tangfei Tao & Guanghua Xu, 2019. "Ultrasonic Guided Wave Phased Array Focusing Technology and Its Application to Defrosting Performance Improvement of Air-Source Heat Pumps," Energies, MDPI, vol. 12(16), pages 1-18, August.
    14. 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.
    15. 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.
    16. 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.
    17. Tan, Haihui & Xu, Guanghua & Tao, Tangfei & Sun, Xiaoqi & Yao, Wudong, 2015. "Experimental investigation on the defrosting performance of a finned-tube evaporator using intermittent ultrasonic vibration," Applied Energy, Elsevier, vol. 158(C), pages 220-232.

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