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 Cooling-main Operating Mode

냉방주체 운전모드에서 동시냉난방 열펌프 성능향상에 관한 실험적 연구

  • Chung, Hyun-Joon (Graduate School of Mechanical Engineering, Korea University) ;
  • Joo, Young-Ju (Graduate School of Mechanical Engineering, Korea University) ;
  • Kang, Hoon (Department of Mechanical Engineering, Korea University) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University) ;
  • Choi, Jong-Min (Department of Mechanical Engineering, Hanbat National University)
  • 정현준 (고려대학교 기계공학과 대학원) ;
  • 주영주 (고려대학교 기계공학과 대학원) ;
  • 강훈 (고려대학교 기계공학과) ;
  • 김용찬 (고려대학교 기계공학과) ;
  • 최종민 (한밭대학교 기계공학과)
  • Published : 2008.05.10
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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 improved wall insulation. Hence, a multi~heat pump is required to cover heating and cooling simultaneously for each indoor unit. In this study, the operating characteristics and performance of a simultaneous heating and cooling heat pump in the cooling-main operating mode were investigated experimentally. The system adopted a variable speed compressor using R410A with four indoor units and one outdoor unit. In the cooling-main mode, the heating capacity decreased due to reduction of flow rate to the indoor unit under heating mode operation. The EEV opening was adjusted to increase flow rate to the indoor unit under heating mode operation. The total capacity and COP in the cooling-main mode increased by 20.5% and 29.2%, respectively, compared with those in the cooling-only mode.

Keywords

References

  1. Nagatomo, S., 1998, Positive displacement compressor technology for air conditioners, Transactions of the JSRAE, Vol. 15, No. 4, pp. 305-326
  2. Han, D. and Kwon, H., 1999, Zone temperature control of the multi-type heat pump system, Proceedings of the SAREK, pp. 611-616
  3. Outtagarts, A., 1997, The transient response of an evaporator feed through an electronic expansion valve, Int. J. of Energy Research, Vol. 21, pp. 793-807 https://doi.org/10.1002/(SICI)1099-114X(199707)21:9<793::AID-ER297>3.0.CO;2-P
  4. Murphy, F. T., Low, R. E., Gilbert, B. E., Linton, J. W., Snelson, W. K. and Hearty, P. E., 1995, Comparison of R407C and R410A with R22 in a 10.5 kW residential central air-conditioner, Proceeding of International CFC and Halon Alternative Conference, pp. 31-40
  5. Park, T. J., Lee, M. K., Jeong, J. H. and Chang, K. S., 2003, Comparison of performance variation between R-22 and R410A refrigeration systems, Korean Journal of Air-Conditioning and Refrigeration Eng- ineering, Vol. 15, No. 3, pp. 166-176
  6. ASHARE Standard, 1975, Laboratory methods of testing fans for rating, pp. 51-75
  7. ASHRAE Standard, 1978, Methods of testing for rating unitary air conditioning and heat pump equipment, pp. 37-78
  8. ISO/DIS 15042, 2005, Multi-split air conditioners and air-to-air heat pumps-Testing and rating for performance