- In the developed triple-pressure levels single stage cycle a jet ejector of a special design is added at the absorber inlet. The device serves two major functions: it facilitates pressure recovery and improves the mixing process between the weak solution and the refrigerant vapor coming from the evaporator. These effects enhance the absorption process of the refrigerant vapor into the solution drops. To facilitate the design of a jet ejector for absorption machines, a numerical model of simultaneous heat and mass transfer between the liquid and the gas phases in the ejector was developed. The refrigerant R125 and the absorbent DMETEG were used in these calculations. Based on the computerized simulation program a parametric study of the triple-pressure levels single stage absorption cycle was carried out. The influence of the jet-ejector on the performance of the absorption cycle was studied.