| Title |
Performance Analysis of a CO₂ Two-Stage Twin Rotary Compressor |
| Authors |
김우영(Woo Young Kim) ; 안종민(Jong Min Ahn) ; 김현진(Hyun Jin Kim) ; 조성욱(Sung Oug Cho) |
| Keywords |
트윈 로타리 압축기 ; 2단 압축 ; 압축기 입력 ; 냉동능력 ; 성적계수 Twin rotary compressor ; Two-stage compression ; Compressor input ; Cooling capacity ; COP |
| Abstract |
Analytical investigation on the performance of a two stage twin rotary compressor for CO₂ heat pump water heater system has been carried out. A computer simulation program was made based on analytical models for gas compression in control volumes, leakages among neighboring volumes, and dynamics of moving elements of the compressor. Calculated cooling capacity, compressor input, and COP were well compared to those of experiments over the compressor speeds tested. For the operating condition of suction pressure of 3 MPa, and discharge pressure of 9MPa, and compressor inlet temperature of 35℃, the compressor efficiency was calculated to be 80.2%: volumetric, adiabatic, and mechanical efficiencies were 88.3%, 93.2%, and 92.7%, respectively. For the present compressor model, volumetric and adiabatic efficiencies of the second stage cylinder were lower by about 6∼7% than those of the first stage mainly due to the smaller discharge port at the second stage. Parametric study on the discharge port size showed that the compressor performance could be improved by 3.5% just by increasing the discharge port diameter by 20%. |