Abstract
This paper reports measurements of the PVTx properties of the R152a + R114 system for 10, 20, 50, 80, 90 and 100 wt% R152a mixtures. The PVTx measurements of this work were made by the constant volume method coupled with isothermal expansion procedures for a certain fixed composition of a mixture. The measurements were conducted in the range of temperatures from 303 to 443K, pressures from 0.4 to 9.7 MPa and of densities from 160 to 1330 kg/m3 along 46 different isochores. The experimental uncertainty in the determination of the composition was estimated to be less than 0.1 % for eachcomposition. And the experimental uncertainties in the temperature, density and pressure measurements were estimated ±8mK, ±0.16% and ±3kPa, respectively. Comparing our vapor pressure data for pure R152a with other reported data and correlation, it was found that the present measurements were consistentand reliable. Analyzing the present experimental results graphically and referring to the measured data of coexistence curves, the dew and bubble points for measured isochores were determined and the composition dependence of the critical points were examined. We have also discussed the general behavior of the critical curve for the present binary refrigerant mixtures with those of other mixtures reported previously by the present authors.
