Pressure-volume-temperature behavior of difluoromethane

The viscosity of R32 and R125 at saturation

“…The situation is therefore similar to that encountered for R134a in the early stages of the study of that fluid and reviewed elsewhere [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The reasons for those early discrepancies and those revealed here remain obscure and further systematic studies are obviously required.…”

“…The density data for R32 in the vapor phase have been taken from the work of Malbrunot et al [10], whereas those for R125 have been obtained from Wheelhouse [11]. The latter density data are not as reliable as those for the liquid phase.…”

Critical (p , ρ , T) properties of CH2F2, {xCO2+(1−x) SF6}, {xSF6+(1−x) CH2F2}, and {xCHF3+(1−x) CH2F2}

“…(12)(13)(14)(15)(16)(17) The critical density determined from our measurements also agrees with published data within the experimental uncertainty. Only the earlier data of Malbrunot et al (11) deviate significantly from our values.…”

“…and, (11) 351.36 ± 0.02 419 ± 7 Schmidt and Moldover (12) 351.255 5.784 424 Kuwabara et al (13) 351.26 ± 0.08 5.784 ± 0.011 424 ± 2 Zhelezny et al (14) 351.36 5.7927 ± 0.0024 Defibaugh et al (15) 351.295 ± 0.01 5.785 ± 0.002 425 ± 3 F uet al (16) 351.23 ± 0.06 5.783 ± 0.006 420 ± 8 Türk et al (3) 351.26 ± 0.01 427 ± 5 Higashi (17) 351. where Z c is the critical compressibility factor and M is the molar mass.…”

A nonlinear regression analysis for estimating low-temperature vapor pressures and enthalpies of vaporization applied to refrigerants

“…3), values of Weber and Goodwin [22] and of Weber and Silva [ 19] were used to fit the parameters. The data extend to 208 K. There are some data at lower temperatures measured by Malbrunot et al [23] and some calculated values by Kanungo etal. [24].…”