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A combined Dual Hot-Gas Bypass Defrosting method with accumulator heater for an air-to-air heat pump in cold region

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  • Kim, Jaehong
  • Choi, Hwan-Jong
  • Kim, Kyung Chun

Abstract

The Dual Hot-Gas Bypass Defrosting (DHBD) cycle is an effective defrosting method compared to a Reverse Cycle Defrosting (RCD) method to remove frost from the outdoor heat exchanger (HEX) of an air-to-air heat pump, especially the outdoor temperature is above 0°C. However, the DHBD method has a drawback when the heat pump operates in cold outdoor environment, below 0°C due to rapid decrease in refrigerant temperature followed by lower hot-gas bypass temperature. In order to overcome lower discharge temperature of compressor, a combined defrosting cycle with DHBD and the accumulator heating method is developed. An induction heater (IH) is adopted as the accumulator heater. The dynamic performance and defrosting time are compared between the conventional RCD method and the combined DHBD–IH method using a medium size air-to-air heat pump of 16kW under the condition of −5°C outdoor temperature. Due to the additional heater, the combined DHBD–IH method sustained higher discharge temperature of the compressor and reduced 15% of the defrosting time than that of the RCD method with nonstop indoor heating operation. The overall heating capacity of the DHBD–IH cycle including defrosting mode was 2.5kW higher than that of the RCD cycle.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:147:y:2015:i:c:p:344-352
    DOI: 10.1016/j.apenergy.2015.02.074
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    References listed on IDEAS

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    1. Choi, Hwan-Jong & Kim, Byung-Soon & Kang, Donghoon & Kim, Kyung Chun, 2011. "Defrosting method adopting dual hot gas bypass for an air-to-air heat pump," Applied Energy, Elsevier, vol. 88(12), pages 4544-4555.
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    4. Kaygusuz, Kamil, 1994. "Performance of an air-to-air heat pump under frosting and defrosting conditions," Applied Energy, Elsevier, vol. 48(3), pages 225-241.
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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. 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).
    3. Chen, Siliang & Chen, Kang & Zhu, Xu & Jin, Xinqiao & Du, Zhimin, 2022. "Deep learning-based image recognition method for on-demand defrosting control to save energy in commercial energy systems," Applied Energy, Elsevier, vol. 324(C).
    4. 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.
    5. 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.
    6. 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.
    7. 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.
    8. 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.
    9. 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.
    10. 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.
    11. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    12. 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.
    13. 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.
    14. Konrad, Mary Elizabeth & MacDonald, Brendan D., 2023. "Cold climate air source heat pumps: Industry progress and thermodynamic analysis of market-available residential units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    15. Wang, Jijin & Qv, Dehu & Yao, Yang & Ni, Long, 2021. "The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study," Energy, Elsevier, vol. 221(C).

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