Vapor and Liquid (p-ρ-T-x) Measurements of Binary Refrigerant Blends Containing R-134a, R-1234yf, and R-1234ze(E)

Thepressure-density-temperature-composition(p-& rho;-T-x) data of binary refrigerantmixtures containing R-134a (1,1,1,2-tetrafluoroethane), 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 studycomprised two compositions of approximately (0.3/0.7) and (0.7/0.3)mole fraction for each of the following three binary refrigerant blends:R-1234yf + R-134a, R-134a + R-1234ze(E), and R-1234yf + R-1234ze(E). Single-phase vapor densitieswere measuredover a temperature range of 253 to 293 K and pressures from approximately0.04 to 0.5 MPa. Single-phase liquid and supercritical densities weremeasured over a temperature range of 230 to 400 K and pressures upto 21 MPa; for refrigerant blends containing R-1234yf, the maximumpressure was limited to approximately 12 MPa. Overall relative combined,expanded (k = 2) uncertainties in density rangedfrom 0.043 to 0.418%, with an average uncertainty of approximately0.06%. Here, we present measurement results, along with comparisonsto available literature data and to default equations of state andmixture models included in REFPROP.