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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

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

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 downwards flowing of the melted frost over a vertical multi-circuit outdoor coil in an ASHP unit has negative effects on reverse cycle defrosting performance. To quantitatively study the negative effects, an experimental study and a modeling study on draining away locally the melted frost for an experimental ASHP unit with a three-circuit outdoor coil were carried out and separately reported. However, for exiting ASHP units, it is hardly possible to install water collecting trays between circuits. To alleviate uneven defrosting for a vertical multi-circuit outdoor coil in an existing ASHP unit, an effective alternative is to vary the heat supply to each refrigerant circuit by varying the opening values of modulating valves installed at an inlet pipe to each circuit. In this paper, a modeling study on varying heat (via refrigerant) supply to each refrigerant circuit in a three-circuit outdoor coil to alleviate uneven defrosting is reported. Finally, in the designed three study cases, defrosting energy use could be decreased to 94.6%, as well as a reduction of 7s in defrosting duration by fully closing the modulating valve on the top circuit when its defrosting terminated.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:161:y:2016:i:c:p:268-278
    DOI: 10.1016/j.apenergy.2015.10.026
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    References listed on IDEAS

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    1. 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.
    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.
    3. 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.
    4. Huang, Dong & Li, Quanxu & Yuan, Xiuling, 2009. "Comparison between hot-gas bypass defrosting and reverse-cycle defrosting methods on an air-to-water heat pump," Applied Energy, Elsevier, vol. 86(9), pages 1697-1703, September.
    5. 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.
    6. 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.
    7. Yin, Hai-Jiao & Yang, Zhao & Chen, Ai-Qiang & Zhang, Na, 2012. "Experimental research on a novel cold storage defrost method based on air bypass circulation and electric heater," Energy, Elsevier, vol. 37(1), pages 623-631.
    8. Wang, Fenghao & Wang, Zhihua & Zheng, Yuxin & Lin, Zhang & Hao, Pengfei & Huan, Chao & Wang, Tian, 2015. "Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification," Applied Energy, Elsevier, vol. 139(C), pages 212-219.
    9. Kim, Jaehong & Choi, Hwan-Jong & Kim, Kyung Chun, 2015. "A combined Dual Hot-Gas Bypass Defrosting method with accumulator heater for an air-to-air heat pump in cold region," Applied Energy, Elsevier, vol. 147(C), pages 344-352.
    10. 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.
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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. 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.
    3. Tang, Jinchen & Gong, Guangcai & Su, Huan & Wu, Fanhao & Herman, Cila, 2016. "Performance evaluation of a novel method of frost prevention and retardation for air source heat pumps using the orthogonal experiment design method," Applied Energy, Elsevier, vol. 169(C), pages 696-708.
    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. 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.
    7. 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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