Thermophysical capability of ozone-safe working fluids for an organic rankine cycle system

Abstract The thermodynamic performance of a variety fluids circulated in an ideal organic Rankine cycle (ORC) engine has been evaluated with the aid of the Iwai-Margerum-Lu equation of state. Two merit number indices were also calculated to represent the inherent heat-transfer capability of the working media at evaporation and condensation, respectively. The result indicated that the thermophysical capability of compounds correlates with the fluid's normal boiling point, critical pressure and molecular weight. It also showed that HCFC-123 could be one of the most favourable ozone-safe working fluids for the ORC energy-recovery system.

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