Measurements of PVTx properties of refrigerant mixture HFC-32+HFC-125 in the gaseous phase
- Keio Univ., Yokohama (Japan); and others
The experimental 156 PVTx 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 temperatures T from 320 to 440 K, of pressures P from 1.8 to 5.3 MPa, and of densities p from 50 to 124 kg {sm_bullet} m{sup {minus}1}. The experimental uncertainties of the present measurements are estimated to be within {plus_minus}7 mK in temperature, {plus_minus}2 kPa in pressure, {plus_minus}0.2% in density and {plus_minus}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 coefficients for temperatures from 320 to 440 K have been determined by the present measurements.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 376907
- Report Number(s):
- CONF-940633--
- Journal Information:
- International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 1 Vol. 17; ISSN 0195-928X; ISSN IJTHDY
- Country of Publication:
- United States
- Language:
- English
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