Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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The performance of a heat pump with 3-piping system at various charging conditions

3관식 시스템 히트펌프의 충전량 변화에 따른 성능 특성에 관한 연구

  • Song, In-Sik (Graduate School of Mechanical Engineering, Hanbat National University) ;
  • Choi, Jong-Min (Department of Mechanical Engineering, Hanbat National University) ;
  • Joo, Young-Ju (Graduate School of Mechanical Engineering, Korea University) ;
  • Chung, Hyun-Joon (Graduate School of Mechanical Engineering, Korea University) ;
  • Kang, Hoon (Graduate School of Mechanical Engineering, Korea University) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
  • 송인식 (한밭대학교 기계공학과 대학원) ;
  • 최종민 (한밭대학교 기계공학과) ;
  • 주영주 (고려대학교 기계공학과 대학원) ;
  • 정현준 (고려대학교 기계공학과 대학원) ;
  • 강훈 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2008.06.25
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Abstract

The cooling load in winter is significant in many commercial buildings and hotels because of the usage of office equipments and the high efficiency of wall insulation. The development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the performance of a multi-heat pump with 3-piping system was investigated as a function of refrigerant charge and its performance was analyzed in cooling mode, heating mode, and heat recovery mode. COP in the heating or cooling mode showed little dependence on refrigerant charge at overcharge conditions, while those were strongly dependent on refrigerant charge at undercharge conditions and outdoor inlet temperature. In the heat recovery mode, the performance of the system was very sensitive to charge amount at all conditions. Optimum charge amount in the heat recovery mode was 14% lower than that in the cooling mode at the standard condition because the refrigerant only passed the indoor units. It is required to store the excessive refrigerant charge in a storage tank to optimize the system performance at operating modes.

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