Gaseous <i>pvTx</i> Properties for Binary and Ternary Mixtures of R1234yf, R32, and CO₂

Abstract

The gaseous pressure–volume–temperature–composition ( pvTx ) properties of pure R1234yf, binary mixtures of R32 + R1234yf and CO 2 + R1234yf, and a ternary mixture of CO 2 + R32 + R1234yf were measured using the Burnett apparatus from 343.15 to 383.15 K. The maximum expanded measurement uncertainties ( k = 2) of the temperature, pressure, and mole fraction were 20 mK, 1.4 kPa, and 0.004, respectively. The relative expanded measurement uncertainty of the mole density was 0.001. The mass density was calculated using the mole density, mole fraction, and molar mass. The relative expanded uncertainties of mass density were 0.001, 0.004, and 0.006 for the pure fluid, binary mixture, and ternary mixture, respectively. The virial equation of state (EoS) was established based on the experimental data. Compared with the REFPROP 10.0 and virial EoS values, the root mean square errors (RMSE) of the measured density data were 0.2 and 0.1% for the R32 + R1234yf binary mixture (0.4–2.8 MPa) and 0.7 and 0.03% for the CO 2 + R1234yf binary mixture (0.4–5.0 MPa). The measured data of the CO 2 + R32 + R1234yf ternary mixture at 0.6–5.8 MPa were predicted using REFPROP 10.0 and the virial EoS.