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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 II: Modeling analysis

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

Abstract

The experimental part of the study of the reverse cycle defrosting performance on a four-circuit outdoor coil unit in an experimental 6.5kW heating capacity residential ASHP has been reported in Part I of a two-part series. The experimental results indicated that downwards flowing of the melted frost along a multi-circuit outdoor coil surface would have negative effects on defrosting performance. In order to quantitatively analyze the effects, this paper, the second part of the two-part series, reports on a modeling analysis where a semi-empirical model of the airside defrosting in the four-circuit outdoor coil unit was developed. The model was validated by comparing the predicted defrosting duration and temperature variation of collected melted frost with the corresponding experimental data presented in Part I of the two-part series. Using the validated model, the frost-melting rate and the temperature of melted frost on the surface of each circuit were predicted. The effects of the downwards flowing melted frost along the entire outdoor coil surface on defrosting performance were quantitatively analyzed.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:91:y:2012:i:1:p:274-280
    DOI: 10.1016/j.apenergy.2011.08.036
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    Citations

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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. Xiong, Tong & Chen, Qi & Xu, Shijie & Liu, Guoqiang & Gao, Qiang & Yan, Gang, 2024. "A new defrosting model for microchannel heat exchanger heat pump system considering the effects of drainage and water retention," Energy, Elsevier, vol. 289(C).
    13. 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).
    14. 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.
    15. 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.
    16. 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.
    17. 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.
    18. 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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