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Energy transfer procession in an air source heat pump unit during defrosting

Author

Listed:
  • Song, Mengjie
  • Xu, Xiangguo
  • Mao, Ning
  • Deng, Shiming
  • Xu, Yingjie

Abstract

Air source heat pump units have found their wide applications in recent decades due to their high efficiency and low environmental pollution. To solve their undesired frosting problem, reverse cycle defrosting is always employed. As a transient and nonlinear heat and mass transfer procession, defrosting performance directly affects the occupants’ thermal comfort. During defrosting, the metal energy storage values of indoor and outdoor coils are varied as their temperature fluctuations. It is therefore necessary to investigate the energy transfer procession in an air source heat pump unit and the effect of metal energy storage during defrosting. However, scarce of attentions were paid to this fundamental problem. In this study, two experimental cases with two-working-circuit and three-working-circuit outdoor coils were conducted basing on frost evenly accumulated on their surfaces. After four types of energy supply and five types of energy consumption during defrosting were calculated, a qualitative and quantitative evaluation on the metal energy storage effect was then given. As concluded, after the outdoor coil enlarged 50%, the metal energy storage effect can be changed from positive (0.33%) to negative (−2.18%). The percentages of energy consumed on melting frost and vaporizing retained water were both increased. Defrosting efficiency was improved about 6.08%, from 42.26% to 48.34%. Contributions of this study can effectively guide the design optimization of indoor and outdoor coils and promote the energy saving for air source heat pump units.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:204:y:2017:i:c:p:679-689
    DOI: 10.1016/j.apenergy.2017.07.063
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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.
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    3. 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.
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    9. 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.
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    1. 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).
    2. 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.
    3. 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.
    4. 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.
    5. Shao, Suola & Zhang, Huan & You, Shijun & Zheng, Wandong & Jiang, Lingfei, 2019. "Thermal performance analysis of a new refrigerant-heated radiator coupled with air-source heat pump heating system," Applied Energy, Elsevier, vol. 247(C), pages 78-88.
    6. 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.
    7. Rong, Xiangyang & Long, Weiguo & Jia, Jikang & Liu, Lianhua & Si, Pengfei & Shi, Lijun & Yan, Jinyue & Liu, Boran & Zhao, Mishen, 2023. "Experimental study on a multi-evaporator mutual defrosting system for air source heat pumps," Applied Energy, Elsevier, vol. 332(C).
    8. Wang, Jidong & Liu, Jianxin & Li, Chenghao & Zhou, Yue & Wu, Jianzhong, 2020. "Optimal scheduling of gas and electricity consumption in a smart home with a hybrid gas boiler and electric heating system," Energy, Elsevier, vol. 204(C).
    9. Sun, Zhili & Wang, Qifan & Xie, Zhiyuan & Liu, Shengchun & Su, Dandan & Cui, Qi, 2019. "Energy and exergy analysis of low GWP refrigerants in cascade refrigeration system," Energy, Elsevier, vol. 170(C), pages 1170-1180.
    10. Li, Gang & Du, Yuqing, 2018. "Performance investigation and economic benefits of new control strategies for heat pump-gas fired water heater hybrid system," Applied Energy, Elsevier, vol. 232(C), pages 101-118.
    11. Yi Zhang & Guanmin Zhang & Aiqun Zhang & Yinhan Jin & Ruirui Ru & Maocheng Tian, 2018. "Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review," Energies, MDPI, vol. 11(10), pages 1-36, October.
    12. Xiang Gou & Shian Liu & Yang Fu & Qiyan Zhang & Saima Iram & Yingfan Liu, 2018. "Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater," Energies, MDPI, vol. 11(10), pages 1-18, October.

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