| Title |
Experimental Study on the Performance of a CO2 Heat Pump Water Heater |
| Authors |
이응찬(Eungchan Lee) ; 백창현(Changhyun Baek) ; 강훈(Hoon Kang) ; 김용찬(Yongchan Kim) ; 조홍현(Honghyun Cho) ; 조성욱(Sungwook Cho) |
| Keywords |
CO2 급탕 열펌프 ; 급탕온도 ; 급수유량 ; 성능계수 CO2 heat pump water heater ; Water heating temperature ; Water mass flow rate ; Coefficient of Performance(COP) |
| Abstract |
The performance of a CO2 heat pump water heater was measured with a variation of operating conditions such as refrigerant charge amount, outdoor temperature, compressor frequency, EEV opening, and water mass flow rate. The optimum refrigerant charge amount of the CO2 system was 1800g. At water mass flow rates of 75, 85, and 95kg/h, the water heating temperatures were 74, 67, and 62℃ and COPs were 2.6, 2.8, and 3.0, respectively. Besides, the compressor frequency and water mass flow rate were adjusted to maintain the water heating temperature at 60℃ with the decrease of outdoor temperature. As the outdoor temperature decreased by 5℃, the compressor frequency increased beyond 60Hz and the water mass flow rate decreased by 16.7%. |