Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Performance Characteristics of Water-Chilling Heat Pump Using CO2 on Variation of Refrigerant Charge Amount

냉매 충전량에 따른 CO2용 수냉식 열펌프의 성능 특성에 관한 연구

  • 손창효 (부경대학교 냉동공조공학) ;
  • 유태근 (부경대학교 냉동공조공학) ;
  • 장승일 (부경대학교 냉동 공조공학 대학원) ;
  • 오후규 (부경대학교 냉동공조공학)
  • Published : 2007.07.31
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Abstract

The performance characteristics of water-chilling heat pump using $CO_2$ with respect to variation of refrigerant charge amount was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter-flow-type heat exchangers with concentric dual tubes, which are made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2400 mm length. The experimental results summarize as the followings : As the refrigerant charge ratio of $CO_2$ heat pump system increases, the discharge pressure and compressor ratio increases, but mass flow rate of refrigerant decreases. Also the compressor work increases with the increase of refrigerant charge ratio. However, the heating and cooling capacity of $CO_2$ heat pump decreases as the refrigerant charge ratio increases. The maximum heating COP of $CO_2$ heat pump system presented at 0.25 refrigerant charge ratio. It is possible to confirm the optimum charge ratio of $CO_2$ heat pump system by the viewpoint of heating COP.

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References

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