Experimental Investigation of a Solar-Assisted Ejector Cooling System at Different Ejector Area Ratios

Abstract

In this study, the performance of solar-assisted ejector cooling system (SAECS) was experimentally investigated with different ejector area ratios (A_r) such as 6.56, 7.17 and 7.86. In experiments single glazed selective type collectors with 4.6 m², 6.9 m², 9.2 m² and 13.8 m² collector areas (A_c) were used for different ejector area ratios. Experiments were performed between 10:00- 16:00 o’clock on different days of June, July and August in Konya, Turkey.  For all experiments condenser temperatures (T_c) were at a range of 26 °C and 28 °C while evaporator temperature (T_e) was kept at 8 °C. R123 was used as the working fluid. As the results, maximum coefficients of performance (COP) values corresponding to optimum generator temperatures (T_gopt)) were determined 33.5% for 70 °C and 37% for 73.5 °C and 38.8% for 76 °C, and   average cooling capacities (Q_e) were found as 758 W, 921W and 1027 W, after ejectors chocked, for ejector area ratios of 6.56, 7.17 and 7.86, respectively. An equation was defined between the generator temperatures (T_g) and collector areas to find optimum collector areas for different ejector area ratios at the applied operating condition.