Study of a gas–liquid ejector and its application to a solar-powered bi-ejector refrigeration system

A new configuration of a bi-ejector refrigeration system is presented. The system incorporates two ejectors. The purpose of one is to suck refrigerant vapour from the evaporator and discharge to the condenser; the other acts as a jet pump to pump liquid refrigerant from the condenser to the generator. An analysis model for the bi-ejector refrigeration system and a one-dimensional flow model for the gas–liquid ejector were established. The performances of the gas–liquid ejector and the refrigeration cycle were studied using numerical modelling. The results show that the performances of ejectors and system depend a great deal on the refrigerants as well as on operation conditions.