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An experimental study on even frosting performance of an air source heat pump unit with a multi-circuit outdoor coil

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

Abstract

When the surface temperature of the outdoor coil in an air source heat pump (ASHP) unit is lower than both the air dew point and freezing point of water, frost can be formed and accumulated over outdoor coil’s surface. On the other hand, an outdoor coil normally has multiple parallel circuits on its refrigerant side for minimized refrigerant pressure loss and enhanced heat transfer efficiency. Currently, most attentions were paid to the experimental and numerical studies on defrosting with different methods, without however paying attention to the distribution of frost accumulation on the multi-circuit outdoor coil. The phenomenon of uneven frosting exists, which also maybe the most important reason of uneven defrosting for an ASHP unit with a multi-circuit outdoor coil. Therefore, in this study, a comparative and experimental study on system frosting performance when frost accumulated on a three-circuit outdoor coil’s surface in an ASHP unit at different frosting evenness values (FEVs) has been carried out. Experimental results indicated that, when the FEV was increased from 75.7% to 90.5% for an ASHP unit with a three-circuit outdoor coil, the COP could be increased from 4.10 to 4.26 at a 3600s frosting process, and increased from 3.18 to 4.00 at its last 600s.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:164:y:2016:i:c:p:36-44
    DOI: 10.1016/j.apenergy.2015.11.036
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    References listed on IDEAS

    as
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    4. 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.
    5. Xu, Wei & Liu, Changping & Li, Angui & Li, Ji & Qiao, Biao, 2020. "Feasibility and performance study on hybrid air source heat pump system for ultra-low energy building in severe cold region of China," Renewable Energy, Elsevier, vol. 146(C), pages 2124-2133.
    6. Adnan Rasheed & Jong Won Lee & Hyeon Tae Kim & Hyun Woo Lee, 2022. "Study on Heating and Cooling Performance of Air-to-Water Heat Pump System for Protected Horticulture," Energies, MDPI, vol. 15(15), pages 1-19, July.
    7. Hu, Wenju & Song, Mengjie & Jiang, Yiqiang & Yao, Yang & Gao, Yan, 2019. "A modeling study on the heat storage and release characteristics of a phase change material based double-spiral coiled heat exchanger in an air source heat pump for defrosting," Applied Energy, Elsevier, vol. 236(C), pages 877-892.
    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. 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. Mao, Ning & Hao, Jingyu & Cui, Borui & Li, Yuxing & Song, Mengjie & Xu, Yingjie & Deng, Shiming, 2018. "Energy performance of a bedroom task/ambient air conditioning (TAC) system applied in different climate zones of China," Energy, Elsevier, vol. 159(C), pages 724-736.
    12. Pu, Jihong & Shen, Chao & Zhang, Chunxiao & Liu, Xingjiang, 2021. "A semi-experimental method for evaluating frosting performance of air source heat pumps," Renewable Energy, Elsevier, vol. 173(C), pages 913-925.
    13. Liu, Shengchun & Li, Hailong & Song, Mengjie & Dai, Baomin & Sun, Zhili, 2018. "Impacts on the solidification of water on plate surface for cold energy storage using ice slurry," Applied Energy, Elsevier, vol. 227(C), pages 284-293.
    14. Haolu Liu & Khurram Yousaf & Kunjie Chen & Rui Fan & Jiaxin Liu & Shakeel Ahmed Soomro, 2018. "Design and Thermal Analysis of an Air Source Heat Pump Dryer for Food Drying," Sustainability, MDPI, vol. 10(9), pages 1-17, September.
    15. Xiong, Yongqing & Yang, Xiaohan, 2016. "Government subsidies for the Chinese photovoltaic industry," Energy Policy, Elsevier, vol. 99(C), pages 111-119.
    16. Liu, Zhijian & Liu, Yuanwei & He, Bao-Jie & Xu, Wei & Jin, Guangya & Zhang, Xutao, 2019. "Application and suitability analysis of the key technologies in nearly zero energy buildings in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 101(C), pages 329-345.
    17. Wang, Xinru & Xia, Liang & Bales, Chris & Zhang, Xingxing & Copertaro, Benedetta & Pan, Song & Wu, Jinshun, 2020. "A systematic review of recent air source heat pump (ASHP) systems assisted by solar thermal, photovoltaic and photovoltaic/thermal sources," Renewable Energy, Elsevier, vol. 146(C), pages 2472-2487.
    18. Zhang, Qunli & Zhang, Lin & Nie, Jinzhe & Li, Yinlong, 2017. "Techno-economic analysis of air source heat pump applied for space heating in northern China," Applied Energy, Elsevier, vol. 207(C), pages 533-542.
    19. 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.
    20. 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).

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