Experimental investigation on ejector cooling system performance at low generator temperatures and a preliminary study on solar energy

In this paper, the performance of an ejector cooling system with constant-area mixing chamber was investigated at low generator temperatures. The cooling system was tested by using hot water as driving fluid and R123 as working fluid. The effects of operating temperatures on the cooling capacity and on the coefficient of performance (COP) of the system were experimentally investigated at an ejector area ratio of 7.17, which is suitable for solar cooling. As a result, COP of 0.42 was obtained at a vapor generator temperature of 74°C, evaporator temperature of 10°C, and at a critical condenser temperature of 29°C. A solar application of the system with single-glazed selective-type collectors in a horizontal position was conducted as a preliminary study. In the solar application, a cooling capacity of 1080 W for a 9.2 m2 collection area at an evaporator temperature of 10°C was obtained.

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