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Continuous heating of an air-source heat pump during defrosting and improvement of energy efficiency

Author

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  • Jang, Ji Young
  • Bae, Heung Hee
  • Lee, Seung Jun
  • Ha, Man Yeong

Abstract

During winter operation, an air-source heat pump extracts heat from the cold outside air and releases the heat into the living space. At certain outside air conditions, when it operates in heating mode, frost can form on the air-cooled heat exchanger, decreasing the heating performance. Conventionally, reverse-cycle defrosting (RCD) has been the common method of frost removal. But this method requires the interruption of heating during defrosting, as well as a period of time to reheat the cooled pipes of the indoor units after defrosting. In this study, a new technology called continuous heating was developed, which utilize only a hot gas bypass valve to remove the frost from the outdoor heat exchanger and thus enabling the supply of hot air to indoors without any interruption. For this, a new high temperature and low pressure gas bypass method was designed, which is differentiated from the common high pressure hot gas bypass methods by its use of low pressure. Various refrigerant mass flow distributions were examined, and the most effective defrosting mass flow was 50% in this case. Heating capacity was increased by 17% because of continuous heating, and the cumulated energy efficiency was increased by 8% compared to the traditional reverse cycle defrosting over 4h including two defrost operations. Also, cumulated energy efficiency was increased by 27% compared to electronic heaters that supply the same heating capacity during defrosting. By this new technology, it has been proved that continuous heating and energy savings could be achieved without adopting expensive technologies.

Suggested Citation

  • Jang, Ji Young & Bae, Heung Hee & Lee, Seung Jun & Ha, Man Yeong, 2013. "Continuous heating of an air-source heat pump during defrosting and improvement of energy efficiency," Applied Energy, Elsevier, vol. 110(C), pages 9-16.
  • Handle: RePEc:eee:appene:v:110:y:2013:i:c:p:9-16
    DOI: 10.1016/j.apenergy.2013.04.030
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    References listed on IDEAS

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    1. Tassou, S.A. & Marquand, C.J., 1987. "Effects of evaporator frosting and defrosting on the performance of air-to-water heat pumps," Applied Energy, Elsevier, vol. 28(1), pages 19-33.
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    Cited by:

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    4. 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.
    5. 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.
    6. Lee, Joo Seong & Song, Kang Sub & Ahn, Jae Hwan & Kim, Yongchan, 2015. "Comparison on the transient cooling performances of hybrid ground-source heat pumps with various flow loop configurations," Energy, Elsevier, vol. 82(C), pages 678-685.
    7. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    8. Zhao, Han & Liu, Zihan & Sang, Yufeng & Chang, Junzhi & Zheng, Xuejing & Jurasz, Jakub & Zheng, Wandong, 2024. "A visual defrosting control method for air source heat pump system based on machine vision," Energy, Elsevier, vol. 302(C).
    9. 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.
    10. Rafati Nasr, Mohammad & Kassai, Miklos & Ge, Gaoming & Simonson, Carey J., 2015. "Evaluation of defrosting methods for air-to-air heat/energy exchangers on energy consumption of ventilation," Applied Energy, Elsevier, vol. 151(C), pages 32-40.
    11. Kofi Owura Amoabeng & Kwang Ho Lee & Jong Min Choi, 2019. "Modeling and Simulation Performance Evaluation of a Proposed Calorimeter for Testing a Heat Pump System," Energies, MDPI, vol. 12(23), pages 1-22, December.
    12. 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).
    13. 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.
    14. Bottarelli, M. & Bortoloni, M. & Su, Y., 2019. "On the sizing of a novel Flat-Panel ground heat exchanger in coupling with a dual-source heat pump," Renewable Energy, Elsevier, vol. 142(C), pages 552-560.

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