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Evaluation of the impacts of high stage refrigerant charge on cascade heat pump performance

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  • Chae, Jung-Hoon
  • Choi, Jong Min

Abstract

Heat pump systems offer economical alternatives for recovering heat from different sources for use in domestic and industrial refrigeration, space heating, and air conditioning. Some of these domestic and industrial applications require very low evaporating temperatures and very high condensing temperatures which induce high compressor pressure ratios beyond the practical range for single-stage heat pump cycles. This challenge can be overcome by adopting cascade heat pump cycles. In this study, a water-to-water cascade heat pump is tested to investigate the effects of high stage refrigerant charge amount on the performance in a steady state and heating mode operation. The temperature difference between the condensing temperature of the LS cycle and the evaporating temperature of the HS cycle at cascade heat exchanger was increased by reducing the HS refrigerant charge amount, while the heat transfer rate between HS and LS cycles decreased due to a decreasing of refrigerant flow rate. Finally, COP showed lower value at the undercharged condition than that at the fully charged condition. The slope of the capacity with a HS charge amount was much steeper at undercharged conditions than that at overcharged conditions. For HS undercharged conditions, the heating capacity decreased greatly, because heat transfer rate from LS cycle to HS cycle reduced.

Suggested Citation

  • Chae, Jung-Hoon & Choi, Jong Min, 2015. "Evaluation of the impacts of high stage refrigerant charge on cascade heat pump performance," Renewable Energy, Elsevier, vol. 79(C), pages 66-71.
    • Handle: RePEc:eee:renene:v:79:y:2015:i:c:p:66-71
    DOI: 10.1016/j.renene.2014.07.042
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    References listed on IDEAS

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    1. Choi, J.M & Kim, Y.C, 2002. "The effects of improper refrigerant charge on the performance of a heat pump with an electronic expansion valve and capillary tube," Energy, Elsevier, vol. 27(4), pages 391-404.
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    Cited by:

    1. Gao, Peng & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Pressure boost thermochemical sorption heat pump cycle," Energy, Elsevier, vol. 169(C), pages 1090-1100.
    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. Samuel Boahen & Kwang Ho Lee & Jong Min Choi, 2019. "Refrigerant Charge Fault Detection and Diagnosis Algorithm for Water-to-Water Heat Pump Unit," Energies, MDPI, vol. 12(3), pages 1-25, February.
    4. Liu, Jiangyan & Wang, Jiangyu & Li, Guannan & Chen, Huanxin & Shen, Limei & Xing, Lu, 2017. "Evaluation of the energy performance of variable refrigerant flow systems using dynamic energy benchmarks based on data mining techniques," Applied Energy, Elsevier, vol. 208(C), pages 522-539.
    5. Kang Li & Jun Yu & Mingkang Liu & Dan Xu & Lin Su & Yidong Fang, 2020. "A Study of Optimal Refrigerant Charge Amount Determination for Air-Conditioning Heat Pump System in Electric Vehicles," Energies, MDPI, vol. 13(3), pages 1-18, February.

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