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Frosting of heat pump with heat recovery facility

Author

Listed:
  • Liu, Di
  • Zhao, Fu-Yun
  • Tang, Guang-Fa

Abstract

This paper aims to prolong the heat pump frost time and reduce its growth with heat recovery facility, which should mix the exhausted indoor and outdoor air before entering the evaporator. An ideal mathematic model is developed for heat transfer, frost generation and airside pressure drop. The properties of the mixture would be obtained by solving the mass and energy conservation equations. A parametric analysis is performed to investigate the effects of air inlet temperature, relative humidity and air mass flow rate on total heat transfer coefficient, frost thickness and airside pressure drop, respectively. The results show that rationalizing the ratio of indoor and outdoor air could prolong frosting time and reduce the frost thickness greatly. The total heat transfer coefficient, frost thickness and airside pressure drop increase monotonically with time going, but are not proportional. Decreasing the mixture inlet air temperature and relative humidity could essentially reduce frost growth on the tube surfaces. This can also be observed when increasing the air mass flow rate.

Suggested Citation

  • Liu, Di & Zhao, Fu-Yun & Tang, Guang-Fa, 2007. "Frosting of heat pump with heat recovery facility," Renewable Energy, Elsevier, vol. 32(7), pages 1228-1242.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:7:p:1228-1242
    DOI: 10.1016/j.renene.2006.03.019
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    References listed on IDEAS

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    1. Wang, S.W. & Liu, Z.Y., 2005. "A new method for preventing HP from frosting," Renewable Energy, Elsevier, vol. 30(5), pages 753-761.
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    Citations

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    Cited by:

    1. Liu, Di & Zhao, Fu-Yun & Tang, Guang-Fa, 2010. "Active low-grade energy recovery potential for building energy conservation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(9), pages 2736-2747, December.
    2. Liu, Di & Zhao, Fu-Yun & Yang, Hong-Xing & Tang, Guang-Fa, 2015. "Thermoelectric mini cooler coupled with micro thermosiphon for CPU cooling system," Energy, Elsevier, vol. 83(C), pages 29-36.
    3. 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.
    4. Amer, Mohammed & Wang, Chi-Chuan, 2017. "Review of defrosting methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 53-74.
    5. Jadav, Chirag & Chowdhury, Kanchan, 2021. "Minimizing weight of ambient air vaporizer by using identical and different number of fins along the length," Renewable Energy, Elsevier, vol. 163(C), pages 398-413.
    6. Wang, W. & Xiao, J. & Guo, Q.C. & Lu, W.P. & Feng, Y.C., 2011. "Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena," Applied Energy, Elsevier, vol. 88(12), pages 4470-4480.
    7. Byrne, Paul & Miriel, Jacques & Lenat, Yves, 2011. "Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique," Applied Energy, Elsevier, vol. 88(9), pages 3072-3078.
    8. 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.

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