The pressure-density-temperature-composition ( ) data of binary refrigerant mixtures containing R-32 (difluoromethane), R-152a (1,1-difluoroethane), R-227ea (1,1,1,2,3,3,3-heptafluoropropane), R-1234yf (2,3,3,3-tetrafluoropropene), and R-1234ze(E) (trans-1,3,3,3-tetrafluoropropene) were measured in both the vapor and liquid phases using a two-sinker, magnetic-suspension densimeter. The specific samples in this study comprised two compositions of approximately (0.3/0.7) and (0.7/0.3) mole fraction for each of the following four binary refrigerant blends: R-32 + R-1234yf, R-32 + R-1234ze(E), R-1234yf + R-152a, and R-1234ze(E) + R-227ea. Single-phase vapor densities were measured over a temperature range of approximately (253 to 293) K and pressures from (0.05 to 0.98) MPa. Single-phase liquid and supercritical densities were measured over a temperature range of approximately (230 to 400) K and pressures up to 22 MPa; for refrigerant blends containing R-1234yf the maximum pressure was limited to 14 MPa. Overall relative combined, expanded (k = 2) uncertainties in density ranged from 0.025% to 0.191%, with an average uncertainty of approximately 0.05%. Here, we present measurement results, along with comparisons to available literature data and to default equations of state and mixture models included in REFPROP.
Keywords: Density; hydrofluorocarbons; hydrofluoroolefins; refrigerant blends.