Gaseous PVTx Properties for the Binary System 1,1,2,3,3,3-Hexafluoro-1-Propene(R1216) + Trans-1,3,3,3-Tetrafluoropropene(R1234ze(E))

In this paper, based on the principle of the Burnett isothermal expansion method, the P-rho-T data for the R1216/R1234ze(E) mixture, with molar fractions of R1216 at 0.330, 0.564, and 0.786, were measured using a high-precision PVT test bench over a temperature range of 303.15 K to 333.15 K and a pressure range of 0.1 MPa to 1.7 MPa. The uncertainties in the experimental measurements are estimated to be within +/- 1.4 kPa for pressure, +/- 15 mK for temperature, and +/- 0.2 % for molar fraction. Based on the experimental data, the relationship between the second and third Virial coefficients of the mixture R1216 / R1234ze(E) and temperature is fitted, and the Virial equation of state that can realize the high-precision calculations of the fundamental thermal properties of the gas phase of the mixture is obtained. The maximum relative deviation between the pressure values calculated by this equation and the experimental data is only 0.9 %, which verifies the accuracy and reliability of the Virial equation of state for calculating the basic thermophysical properties of R1216/R1234ze(E). This study provides detailed experimental data and reliable computational models for the thermodynamic performance of the new mixed refrigerant, as well as for other application studies.