Experimental Study on the Heating Performance of a $CO_2$ Heat Pump Water Heater

이산화탄소 급탕 열펌프의 난방 성능에 관한 실험적 연구

  • 백창현 (고려대학교 기계공학과 대학원) ;
  • 이응찬 (고려대학교 기계공학과 대학원) ;
  • 강훈 (고려대학교 기계공학과) ;
  • 김용찬 (고려대학교 기계공학과) ;
  • 조홍현 (조선대학교 기계공학과) ;
  • 조성욱 (삼성전자 DA연구소)
  • Published : 2008.11.21

Abstract

In this study, experimental study on the heating performance of a $CO_2$ heat pump water heater with a variation of operating conditions such as refrigerant charge amount, outdoor temperature, compressor frequency, EEV opening and water mass flow rate. Based on the test results, the optimum charge amount was 1800 g. At the water mass flow rates of 75, 85, 95 kg/hr, the water heating temperature was 62, 67, $74^{\circ}C$ and COP was 2.6, 2.8, 3.0, respectively. Besides, the water mass flow rate and compressor frequency were varied to maintain above the water heating temperature of $60^{\circ}C$ with the decrease of outdoor temperature. So, The compressor frequency increased beyond 65 Hz and the water mass flow rate was 45 kg/hr at the outdoor temperature of $-13^{\circ}C$, 65 kg/hr at $-8^{\circ}C$, 75 kg/hr at $-3^{\circ}C$ and 85 kg/hr at 2, $7^{\circ}C$. As the outdoor temperature decreased, the heating COP decreased by 2.5-39.8%.

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