| Title |
Performance Analysis of Vane Rotary Expander for CO2 Cycles |
| Authors |
김호영(Ho Young Kim) ; 안종민(Jong Min Ahn) ; 김현진(Hyun Jin Kim) ; 조성욱(Sung Oug Cho) |
| Keywords |
팽창기 ; 베인 로타리 ; 팽창손실 ; 성적계수 ; 효율 Expander ; Vane rotary ; Expansion loss ; COP ; Efficiency |
| Abstract |
Relatively low cycle performance of a conventional CO2 system is partly due to significant increase in friction loss in the expansion process, since the pressure drop across the expansion device is considerably large compared to a conventional refrigeration cycle. To recover friction loss and increase refrigeration effect by providing isentropic expansion, a rotary vane type expander has been designed. Performance of the designed expander has been investigated by numerical simulation. With the pressure condition of 9MPa/4.5MPa and inlet temperature of 35℃, volumetric, isentropic, and mechanical efficiencies of the expander are calculated to be 58.1%, 101.1%, and 78.8%, respectively, resulting in total expander efficiency of 46.3%. With this expander, COP of a CO2 refrigeration cycle is estimated to be improved by about 14%. |