Abstract
Measurements of the vapor pressure and saturated liquid density for R 245fa (1,1,1,3,3-Pentafluoropropane) were carried out using dual constant volume cells. The apparatus has two cells whose volumes are about 27 cm3 called main cell and 3 cm3 called sub cell which are immersed in a thermostat. The valve is equipped between these cells and pressure sensor is installed in a main cell to measure vapor pressure. The sample filled in the both cell, and then sub cell was fulfilled by the sample at saturation condition. The sample in the sub cell was recovered to the recovery cell using liquid nitrogen and its mass was measured. Saturated liquid density was obtained from the mass of recovered sample and inner volume of the sub cell. The vapor pressure and saturated liquid density for R 245fa were obtained in the range of temperatures from 310 to 400 K, pressures from 224 to 2203 kPa, and densities from 957 to 1306 kg‧m-3. The experimental uncertainties are estimated to be ±0.028 K in temperature, ±0.4 kPa in pressure, ±0.7 kg‧m-3 in density. On the basis of the present data, correlations of vapor pressure and saturated liquid density as a function of temperature were formulated. The experimental results were compared with the existing data.
