Study on the Performance of Zeotropic Mixture Ejector Under Variable Operating Conditions
The use of zeotropic mixture refrigerants,which are characterized by temperature glide and compositional variation,has the potential to enhance the performance of ejector refrigeration systems.To explore the potential performance improvement of zeotropic mixture ejector refrigeration systems,it is important to clarify the operating characteristics of zeotropic mixture ejectors under variable conditions.This study presents a numerical model for a zeotropic mixture(R32/R245fa)ejector based on a real gas model.An experimental setup is constructed for validation.The study analyzes the effects of primary,secondary,and outlet stream conditions on the entrainment per-formance of the R32/R245fa ejector and compares it with that of the conventional pure refrigerant(R245fa)ejector.The results show that the entrainment performance of the R32/R245fa ejector is superior to that of the R245fa ejector.The primary stream pressure is the key parameter affecting the performance of the R32/R245fa ejector.The entrainment ratio reaches its highest value when the primary stream pressure is 1003 kPa.The entrainment ratio of R32/R245fa ejectors increases linearly with the rise in secondary stream temperature.Additionally,R32/R245fa ejectors main-tain excellent entrainment ratios even when deviating from the double-choking mode,presenting a distinct advantage over R245fa ejectors.
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