Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Study on the Performance Improvement of a Simultaneous Heating and Cooling Heat Pump in the Heating-main Operating Mode

난방주체 운전모드에서의 동시냉난방 열펌프 성능향상에 관한 실험적 연구

  • Kang, Hoon (Department of Mechanical Engineering, Korea University) ;
  • Jung, Hyen-Joon (Graduate School of Mechanical Engineering, Korea University) ;
  • Joo, Young-Ju (Graduate School of Mechanical Engineering, Korea University) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University) ;
  • Choi, Jong-Min (Department of Mechanical Engineering, Hanbat National University)
  • 강훈 (고려대학교 기계공학과) ;
  • 정현준 (고려대학교 기계공학과 대학원) ;
  • 주영주 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과) ;
  • 최종민 (한밭대학교 기계공학과)
  • Published : 2008.04.10
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Abstract

The cooling load in winter is significant in buildings and hotels because of the usage of office equipments and the high efficiency of wall insulation. Hence, the development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the operating characteristics and performance of a simultaneous heating and cooling heat pump in the heating-main operating mode were investigated experimentally. The system adopted a variable speed compressor with four indoor units and one outdoor unit with R-410A. In the heating-main mode, the cooling capacity was lower than the design cooling capacity due to the reduction of the flow rate in the indoor unit for the cooling, with the increase of the heating capacity. To solve these problems, the performance characteristics of the simultaneous heating and cooling heat pump in the heating-main mode were investigated by varying the flow rate to the indoor unit for the cooling and the compressor rotating speed. In addition, the adequate control methods were suggested to improve the system efficiency.

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References

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