| Title |
Experimental Study on the Performance of a CO2 Heat Pump Water Heater under Various Operating Conditions |
| Authors |
손동진(Dongjin Sohn) ; 백창현(Changhyun Baek) ; 허재혁(Jaehyeok Heo) ; 강훈(Hoon Kang) ; 김용찬(Yongchan Kim) |
| Keywords |
이산화탄소 급탕 열펌프 ; 급탕온도 ; 성능계수 CO2 heat pump water heater ; Water heating temperature ; Coefficient of Performance(COP) |
| Abstract |
In this study, the steady state performance of a CO2 heat pump water heater was measured with a variation of operating conditions such as refrigerant charge amount, compressor frequency, EEV opening, and water mass flow rate. Transient state performance tests were also conducted to investigate major system effects associated with the interaction between the CO2 heat pump water heater and the water tank. Optimum refrigerant charge amount for the system was 1600 g. At compressor frequencies of 50 Hz and 60 Hz, water mass flow rates of 95 kg/h and 105 kg/h, and EEV opening of 8% and 16%, the water heating temperatures were 65℃ and 68℃ and COPs were 3.0 and 2.8, respectively. In the transient condition, the instantaneous COP decreased with an increase in the inlet water temperature. |