Study on the key ejector structures of the waste heat-driven ejector air conditioning system with R236fa as working fluid

Abstract The ejector performance is numerically and experimentally studied using R236fa as working fluid to analyze the influence of the key geometries of ejector. The computational fluid dynamics (CFD) was employed to predict the flow process and performance of the ejector. A case study was provided in this paper, in which the angles of nozzle outlet were 8°, 10° and 14°, the distance of nozzle exit to mixing chamber was varied as 23 and 33 mm and the length of diffuser was varied as 88 and 103 mm. The CFD results were verified with an experiment. It can be concluded that, the ejector with the nozzle outlet angle of 8°, the distance of nozzle exit to mixing chamber of 23 mm and the diffuser length of 88 mm has the best performance.