R-22, R-290 및 R-407C에 대한 오리피스 및 EEV에서의 유동특성에 관한 실험적 연구

Electronic expansion valve(EEV) is a variable area expansion device which controls superheat at the evaporator exit and refrigerant flow by adjusting the opening of orifice. It shows the best performance among other expansion devices. In this study, performance characteristics of EEV and orifice are investigated separately and compared with R-22 alternatives. Mass flow rate through EEV was strongly dependent on the opening area of inner orifice and choking was not observed in the test range of the present study.