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This presented work concerns the effect of critical properties for pure and binary mixture working fluid on the cycle performances. The results revealed that the relationship between critical temperature and thermal efficiency for pure fluid would depend on the initial operating conditions. Fluids with lower critical temperature would be preferred candidate under defined condensing pressure, while the result would reverse as the condensing temperature is constant. There existed the optimal reduced evaporating temperature range around which the corresponding fluids achieve the peak efficiency, and the maximum would shift right towards the larger ratio as the evaporating pressure increases. For the binary mixtures, the trend of critical pressure with the quality was basically opposite to that of evaporator irreversibility rate. Therefore, the critical properties could be considered as predictive index for selecting working fluids to achieve a preferred efficiency for pure fluids and reduce the evaporator irreversibility rate for mixture fluids

Prediction of the Roles of Critical Properties for Pure and Binary Mixture Working Fluid in Rankine Cycle Performances