Abstract
A virial equation of state is presented for vapor-phase pentafluoro-dimethyl ether (CF3−O−CF2H), a candidate alternative refrigerant known as E125. The equation of state was determined from density measurements performed with a Burnett apparatus and from speed-of-sound measurements performed with an acoustical resonator. The speed-of-sound measurements spanned the ranges 260≤T≤400 K and 0.05≤P≤1.0 MPa. The Burnett measurements covered the ranges 283≤T≤373 K and 0.25≤P≤5.0 MPa. The speed-of-sound and Burnett measurements were first analyzed separately to produce two independent virial equations of state. The equation of state from the acoustical measurements reproduced the experimental sound speeds with a fractional RMS deviation of 0.0013%. The equation of state from the Burnett measurements reproduced the experimental pressures with a fractional RMS deviation of 0.012%. Finally, an equation of state was fit to both the speed-of-sound and the Burnett measurements simultaneously. The resulting equation of state reproduced the measured sound speeds with a fractional RMS deviation of 0.0018% and the measured Burnett densities with a fractional RMS deviation of 0.019%.
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Hurly, J.J., Schmidt, J.W. & Gillis, K.A. Virial equation of state and ideal-gas heat capacities of pentafluoro-dimethyl ether. Int J Thermophys 18, 137–159 (1997). https://doi.org/10.1007/BF02575204
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DOI: https://doi.org/10.1007/BF02575204