Speed-of-sound measurements in gaseous binary refrigerant mixtures of difluoromethane (R-32) + 1,1,1,2-tetrafluoroethane (R-134a)
- Keio Univ., Yokohama (Japan)
One hundred ninety-three speed-of-sound values in gaseous difluoromethane (R-32, CH{sub 2}F{sub 2}) + 1,1,1,2-tetrafluoroethane (R-134a, CF{sub 3}CH{sub 2}F) have been measured using a spherical resonator. The measurements have been carried out at temperatures from 303 K to 343 K, pressures up to 240 kPa, and mole fractions of R-32 from 0.16 to 0.90. The experimental uncertainties in the temperature, pressure, and speed of sound for the binary mixture are estimated to be not greater than {+-}8 mK, {+-}0.1 kPa, and {+-}0.0072%, respectively. The samples purified and analyzed by the manufacturers were used and were better than 99.99 mass % for R-32 and 99.98 and 99.99 mass % for two different R-134a samples. The authors have accurately determined the compositions of the binary refrigerant mixture, R-32 + R-134a, and the second acoustic virial coefficients from the speed-of-sound measurements.
- OSTI ID:
- 509416
- Journal Information:
- Journal of Chemical and Engineering Data, Vol. 42, Issue 3; Other Information: PBD: May-Jun 1997
- Country of Publication:
- United States
- Language:
- English
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