Numerical analysis of an ejector in refrigeration applications using various refrigerants

In this paper, the performance of an ejector in arefrigeration system has been numerically studied usingdifferent refrigerants. The R134a refrigerant, with goodthermodynamic properties, has relatively high geothermalimpact. Consequently, six other environment-friendlyrefrigerants including R152a, R600, R600a, R1234ze,R1234yf and R290 have been replaced. Results show thatthe maximum value of entrainment ratio is obtained usingR290, R600a and R600 refrigerants respectively. Inaddition, the effect of operating temperatures (related to theboiler and evaporator) on ejector performance is evaluatedusing R134a. Results show that enhancement of the boilertemperature has an adverse effect on ejector performanceand reduces the entrainment ratio. In contrast, increasing ofthe evaporator temperature leads to the increment of theentrainment ratio.

کلیدواژه ها:

Ejector ، Entrainment Ratio ، Refrigerant ، Boiler ، Evaporator