THERMODYNAMIC PROPERTIES OF HFC-338MCCQ, CF3CF2CF2CH2F,1,1,1,2,2,3,3,4-OCTAFLUOROBUTANE

We report the thermodynamic properties of 1,1,1,2,2,3,3,4-octafluorobu tane, which has been designated as HFC-338 mccq by the refrigeration i ndustry. The measurements span the temperature and pressure ranges enc ountered in thermal machinery. The properties measured include the vap or pressure, the density of the compressed liquid, the refractive inde x of both the saturated liquid and the saturated vapor, the critical t emperature, the capillary rise, and the speed of sound in the vapor ph ase. These data were used to determine the ideal gas heat capacity, th e saturated liquid and vapor densities, the surface tension, the viria l equation of state for the vapor phase, and estimates of the critical pressure and density. A Carnahan-Starling-DeSantis equation of state was deduced from the measured fluid properties.