ISSN:
1572-9567
Keywords:
critical parameters
;
equation-of-state data
;
HFC-152a
;
vaporliquid equilibrium
;
vapor pressure
;
virial coefficient
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Experimental vapor pressures andP-ρ-T data of an important alternative refrigerant, 1, 1-difluoroethane (HFC-152a), have been measured by means of a constant-volume method coupled with expansion procedures. SixtyP-ρ-T data were measured along eight isochores in a range of temperaturesT from 330 to 440 K, at pressuresP from 1.6 to 9.3 MPa, and at densitiesρ from 51 to 811 kg·m−3. Forty-six vapor pressures were also measured at temperatures from 320 K to the critical temperature. The uncertainties of the temperature and pressure measurements are within ±7mK and ±2kPa, respectively, while the uncertainty of the density values is within ±0.1%. The purity of the sample used is 99.9 wt%. On the basis of the measurements along each isochore, five saturation points were determined and the critical pressure was determined by correlating the vapor-pressure measurements. The second and third virial coefficients for temperatures from 360 to 440 K have also been determined.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01141210
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