THERMODYNAMIC PROPERTIES OF CHF2-CF2-CH2F, 1,1,2,2,3-PENTAFLUOROPROPANE

We report the thermodynamic properties of 1,1,2,2,3-pentafluoropropane (known in the refrigeration industry as HFC-245ca) in the temperature and pressure region commonly encountered in thermal machinery. The pr operties are based on measurements of the vapor pressure, the density of the compressed liquid, the refractive index of the saturated liquid and vapor, the critical temperature, the speed of sound in the vapor phase, and the capillary rise. From these data we deduce the saturated liquid and vapor densities, the equation of state of the vapor phase, the surface tension, and estimates of the critical pressure and densi ty. The data determine the coefficients for a Carnahan-Starlings-DeSan tis (CSD) equation of state. The CSD coefficients found in REFPROP 4.0 are based on the measurements reported here.