Measurements ofPVTx properties of refrigerant mixture HFC-32+HFC-125 in the gaseous phase |
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Authors: | T. Sato H. Kiyoura H. Sato K. Watanabe |
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Affiliation: | (1) Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, 223 Kohoku-ku, Yokohama, Japan |
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Abstract: | The experimental 156PVTx properties of an important binary refrigerant mixture, HFC-32 (difluoromethane)+HFC-125 (pentafluorethane), have been measured for three compositions, i.e., 50, 60, and 80 wt% HFC-32, by a constant-mass-method coupled with expansion procedure in an extensive range of temperaturesT from 320 to 440 K, of pressuresP from 1.8 to 5.3 M Pa, and of densities p from 50 to 124 kg · m–3. The experimental uncertainties of the present measurements are estimated to be within ±7 mK in temperature, ±2 kPa in pressure, ±0.2% in density and ±0.02 wt% of HFC-32. The sample purities are 99.998 wt% for HFC-32 and 99.99 wt% for HFC-125. Seventy-eight second and third virial coeflicients for temperatures from 320 to 440 K have been determined by the present measurements.Paper presented at the Twelfth Symposium on Thermophysical Properties, June 19–24, 1994, Boulder, Colorado, U.S.A. |
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Keywords: | alternative refrigerant binary refrigerant mixtures HFC-32+HFC-125 system PVTx properties thermodynamic properties virial coefficients |
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