Abstract
Measurement of thermophysical properties for gases near the saturation state is difficult, so the number of measurements is limited there. For example, specific heat at near saturation is important for designing air-conditioning and refrigeration systems, which is not correctly determined from equations of state. More than 5% difference is possible to exist among plural equations of state in the worst case such as R-143a. In our group, we study on determination of thermophysical properties including thermodynamic and transport properties such as viscosity, thermal conductivity from theoretical method using intermolecular potential model with the same or better uncertainty as that of measurements. We already confirmed to predict accurate thermodynamic properties and viscosity. For CO_2, isobutane and propane, thermodynamic properties and transport properties are predicted and compared with existing experimental results in this report.
