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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Numerical Study of the Performance Characteristics of a Cascade Heat Pump Water Heater at Low Ambient Temperatures

저온 외기조건에서 케스케이드 급탕열펌프의 성능특성에 관한 해석적 연구

  • Song, Jaehyun (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Jung, Haewon (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Park, JaeWoo (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Kang, Hoon (Department of Mechanical Engineering, Korea University) ;
  • Kim, Yongchan (Department of Mechanical Engineering, Korea University)
  • 송재현 (고려대학교 기계공학과 대학원) ;
  • 정해원 (고려대학교 기계공학과 대학원) ;
  • 박재우 (고려대학교 기계공학과 대학원) ;
  • 강훈 (고려대학교 기계공학과) ;
  • 김용찬 (고려대학교 기계공학과)
  • Received : 2012.11.08
  • Published : 2013.05.10
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Abstract

Heat pump systems have been widely adopted in buildings for cooling and heating, due to their higher energy efficiency. Recently, the demand for hot water supply from the heat pump system has been increasing. To increase the water supply temperature with higher system efficiency and reliability, a heat pump water heater adopting cascade cycle was investigated in this study. The cascade heat pump water heater consisted of a low-stage cycle using R410A, and a high-stage cycle using R134a. A simulation program for the cascade heat pump water heater was developed, and verified by comparison with experimental data. The performance of the cascade heat pump water heater was optimized, by varying the compressor rotating speeds of the low- and high-stage cycles. At low ambient temperatures, the performance of the cascade cycle was compared with that of the single-stage cycle. The system efficiency of the cascade cycle was higher than that of the single-stage cycle, showing a lower compression ratio and compressor discharge temperature.

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References

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