Measurements of pρTx and specific heat capacity c for (R290 + R1243zf) binary mixtures at temperatures from (292 to 350) K and pressures up to 11 MPa

Abstract

Abstract In this paper, isochoric pρTx and specific heat capacity (cv) for (R290 + R1243zf) binary mixtures were measured using an adiabatic batch calorimeter with intermittent heating. A total of 57 pρTx data points over temperatures from (292 to 350) K and 82 isochoric specific heat capacity data points over temperatures from (299 to 350) K were obtained for liquid with mole fractions of R290 at (0.788, 0.606, 0.435 and 0.170). The standard uncertainties were estimated to be 12 mK for temperature, 5 kPa for pressure, 0.30% for density and 0.96% for isochoric specific heat capacity. The experimental density and heat capacity data agree well with the Helmholtz equation of state (EOS) developed by Bell and Lemmon (2016), and the average absolute relative deviation (AARD) are 0.27% and 1.01%, respectively. Comparisons of the present cv data with values calculated by the generalized equation developed by Zhong et al. (2019a) was carried out as well, and the results show good agreements with deviations varying from −3.00% to 3.16% and the average absolute relative deviation (AARD) of 0.91%.