ISSN:
1572-9567
Keywords:
alternative refrigerant
;
binary refrigerant mixtures
;
HFC-32+HFC-125 system
;
PVTx properties
;
thermodynamic properties
;
virial coefficients
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01448208
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