Bubble Point Measurements of Mixtures of HFO and HFC Refrigerants
Stephanie L. Outcalt, Aaron J. Rowane
Abstract
Bubble point pressures of six binary mixtures at two compositions each have been measured utilizing a static method. The performance of the apparatus was characterized from bubble point measurements of R32 + R125 for which 19 literature studies are available for comparison. The mixtures studied were as follows: R1234yf + R134a, R134a + R1234ze(E), R1234yf + R1234ze(E), R125 + R1234yf, R1234ze(E) + R227ea, and R1234yf + R152a. For each mixture, measurements were conducted from 270 to 360 K or to within approximately 10 K of the critical temperature of the pure component with the lower critical temperature. A total of 196 bubble point pressures are reported with combined expanded uncertainties (k = 2) ranging from 0.1 to 0.6%. The measured data are graphically compared to available literature data.