Experimental investigation of the adjustable ejector in a multi-evaporator refrigeration system

In this paper, the experimental investigation was carried out for the performance of adjustable ejector used in a multi-evaporator refrigeration system. The adjustable ejector with a spindle to adjust the area of nozzle throat was applied to deal with the considerable variation in primary cooling load for air-conditioning in such system. The adaptability of the adjustable ejector for the system was first evaluated by the tests and the results show the adjustable ejector can efficiently deal the problem of variable primary cooling load in the system. The tests for the performance of pressure recovery were subsequently carried out. The experimental results indicate that the Pressure Recovery Ratio (PRR) and Relative Pressure Recovery Ratio (RPRR) can reach 20% and 8%, respectively, in the system with design operating condition, which means the adjustable ejector applied in multi-evaporator refrigeration system may be a promising approach for a practical multi-evaporator refrigeration system with significant energy saving. It also can be found that PRR and RPRR are reduced with decreasing of the primary cooling load.