Experimental investigation of performance of vapor ejector refrigeration system using refrigerant R123

In the present study, a novel ejector was designed based on a constant area ejector model and manufactured in order to investigate the performance of an ejector refrigeration system in a wider operating range. The ejector, with movable primary nozzle, was mounted on the system that was previously constructed for low pressure refrigerants. The modified refrigeration system has been tested using hot water as driving fluid and R123 as working fluid. The effects of the operating temperatures on the cooling capacity and performance coefficient of the system were investigated experimentally when the primary nozzle position was optimum at the ejector area ratio of 9.97. As a result, a performance coefficient of 0.39 was obtained at the vapor generator temperature 98 °C, the evaporator temperature 10 °C and critical condenser pressure 129 kPa.