Experimental investigation of an ejector refrigerator: Effect of mixing chamber geometry on system performance

摘要

This paper describes an experimental study of an ejector refrigeration cycle using R11 as the workign fluid.The system was tested with boiler temperature from 100 to 110degC,the condenser temperature from 35 to 41degC, and the evaporator temperature up to 12degC.Two different mixing chambers with throat diameter of 8 mm were used.Choking of the fluid was always found in the first mixing chamber,but not in the second one.The system was more flexible to operate when there was no choking in the mixing chamber.A cooling temperature as low as -5degC could be obtained with COP bewteen 0.1 and 0.25 and cooling capacity between 50 and 1700 W.