Abstract
The speed of sound in gaseous 1,1,1,2-tetrafluoroethane (R-134a, CF3CH2F) and difluoromethane (R-32, CH2F2) has been measured by using a spherical resonator. The measurements for R-134a have been carried out along two isotherms at 323 K and 343 K and at pressures up to 400 kPa for a total of 26 values. For R-32 the measurements were made at 308 K, 323 K, 333 K, and 343 K and at pressures up to 500 kPa for a total of 44 measurements. The experimental uncertainties for R-134a in temperature, pressure, and speed of sound are estimated to be not greater than ±6 mK, ±0.2 kPa, and ±0.0061%, respectively. The experimental uncertainties for R-32 in temperature, pressure, and speed of sound are estimated to be not greater than ±8 mK, ±0.2 kPa, and ±0.0061%, respectively. The purities of the R-134a and R-32 samples were better than 99.95% and 99.99% of area percent of the gas chromatography, respectively. We have determined the ideal-gas heat capacities and the second acoustic virial coefficients from the speed-of-sound measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 1187-1190 |
| Number of pages | 4 |
| Journal | Journal of Chemical and Engineering Data |
| Volume | 41 |
| Issue number | 5 |
| Publication status | Published - 1996 Sep |
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ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
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Speed-of-sound measurements and ideal-gas heat capacity for 1,1,1,2-tetrafluoroethane and difluoromethane. / Hozumi, Tsutomu; Sato, Haruki; Watanabe, Koichi.
In: Journal of Chemical and Engineering Data, Vol. 41, No. 5, 09.1996, p. 1187-1190.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Speed-of-sound measurements and ideal-gas heat capacity for 1,1,1,2-tetrafluoroethane and difluoromethane
AU - Hozumi, Tsutomu
AU - Sato, Haruki
AU - Watanabe, Koichi
PY - 1996/9
Y1 - 1996/9
N2 - The speed of sound in gaseous 1,1,1,2-tetrafluoroethane (R-134a, CF3CH2F) and difluoromethane (R-32, CH2F2) has been measured by using a spherical resonator. The measurements for R-134a have been carried out along two isotherms at 323 K and 343 K and at pressures up to 400 kPa for a total of 26 values. For R-32 the measurements were made at 308 K, 323 K, 333 K, and 343 K and at pressures up to 500 kPa for a total of 44 measurements. The experimental uncertainties for R-134a in temperature, pressure, and speed of sound are estimated to be not greater than ±6 mK, ±0.2 kPa, and ±0.0061%, respectively. The experimental uncertainties for R-32 in temperature, pressure, and speed of sound are estimated to be not greater than ±8 mK, ±0.2 kPa, and ±0.0061%, respectively. The purities of the R-134a and R-32 samples were better than 99.95% and 99.99% of area percent of the gas chromatography, respectively. We have determined the ideal-gas heat capacities and the second acoustic virial coefficients from the speed-of-sound measurements.
AB - The speed of sound in gaseous 1,1,1,2-tetrafluoroethane (R-134a, CF3CH2F) and difluoromethane (R-32, CH2F2) has been measured by using a spherical resonator. The measurements for R-134a have been carried out along two isotherms at 323 K and 343 K and at pressures up to 400 kPa for a total of 26 values. For R-32 the measurements were made at 308 K, 323 K, 333 K, and 343 K and at pressures up to 500 kPa for a total of 44 measurements. The experimental uncertainties for R-134a in temperature, pressure, and speed of sound are estimated to be not greater than ±6 mK, ±0.2 kPa, and ±0.0061%, respectively. The experimental uncertainties for R-32 in temperature, pressure, and speed of sound are estimated to be not greater than ±8 mK, ±0.2 kPa, and ±0.0061%, respectively. The purities of the R-134a and R-32 samples were better than 99.95% and 99.99% of area percent of the gas chromatography, respectively. We have determined the ideal-gas heat capacities and the second acoustic virial coefficients from the speed-of-sound measurements.
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M3 - Article
VL - 41
SP - 1187
EP - 1190
JO - Journal of Chemical and Engineering Data
JF - Journal of Chemical and Engineering Data
SN - 0021-9568
IS - 5
ER -