لخّصلي

To evaluate the performance of the ejector-expansion refrigeration cycle (EERC) using zeotropic mixtures, a numerical study is conducted.This improvement rises at high condensing temperature or low evaporating temperature.The exergy analysis shows that the compressor and ejector contribute the most exergy destruction, and the cycle exergy efficiency achieves a maximum value with MFt of 0.7.A constant-pressure two-phase ejector model for zeotropic mixtures is established.

To evaluate the performance of the ejector-expansion refrigeration cycle (EERC) using
zeotropic mixtures, a numerical study is conducted. A constant-pressure two-phase ejector
model for zeotropic mixtures is established. The effects of both the fluid composition and
the working conditions are investigated. Mixture R134a/R143a is selected as the working
and the simulation results reveal that, the cycle COP increases first and then decreases as
MFt (the mass fraction of R134a) increases in the researched condition. The COP gets a
maximum value of 4.18 with MFt of 0.9 and yields a minimum value of 3.66 with MFt of 0.5.
With mixture 0.9/0.1, the COP improvement reaches a maximum value of 10.47%. This
improvement rises at high condensing temperature or low evaporating temperature. The
exergy analysis shows that the compressor and ejector contribute the most exergy
destruction, and the cycle exergy efficiency achieves a maximum value with MFt of 0.7.