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PVTx Measurements for the R116 + CO2 and R41 + CO2 Systems. New Isochoric Apparatus
No full textA new isochoric apparatus was built for PVTx measurements in an extended temperature range from (210 to 360) K and at pressures up to 6.0 MPa. The setup was used to measure PVTx properties for the R116 CO 2 and R41 CO 2 systems, both in the two-phase and superheated vapor regions. The binary interaction parameters were derived from experimental data in the two-phase region by applying the
flash method and the Carnahan Starling DeSantis equation of state (CSD EOS). The dew-point parameters were found by interpolating the P T isochoric sequences, again applying the CSD EOS. A composition-dependent mixing rule implemented in the CSD EOS improved the VLE data representation
of both binary systems. The resulting binary interaction parameters were used for VLE parameter derivation. The superheated vapor region data were compared with those obtained by the Burnett method and using REFPROP 7
PVT Properties of Dinitrogen Monoxide
No full textThe PVT properties of dinitrogen monoxide (N2O) have been measured. In particular, experiments were performed by means of two different apparatus, both in the two-phase region and in the superheated vapor-phase region: the isochoric method was applied in the saturation region, and the Burnett method was applied in the vapor region. Isochoric measurements were carried out at temperatures from (219 to 273) K and at pressures from (550 to 3100) kPa. The 18 measurements along the saturated liquid-vapor region were fit, together with selected literature data, with the Wagner equation. For Burnett measurements, 14 runs along 7 isotherms in a pressure range from (170 to 5200) kPa were made. The second and third virial coefficients were derived, and good consistency was found after comparison with data in the literature
PVTx measurements of the carbon dioxide+trans-1,3,3,3-tetrafluoroprop-1-ene binary system
No full text
Isochoric PVTx Measurements for the C2H6 + N2O Binary System
No full textIn the search for fluids potentially suitable for low-temperature refrigeration applications, we have turned our attention to systems consisting of natural fluids, nitrous oxide (N2O) and ethane (C2H6) in particular. Isochoric PVTx measurements are reported for nitrous oxide + ethane for both the two-phase and the superheated vapor regions at temperatures ranging from (216 to 358) K and pressures from (494 to 5261) kPa along 11 isochores. The data obtained in the two-phase region were used to derive VLE parameters using a flash method with the Carnahan−Starling−De Santis equation of state (CSD EOS). The dew point was also found for each isochore from the intersection of the P−T sequences. The dew points were then used to derive VLE parameters from CSD EOS. Results from the superheated region were compared with the predicted from the virial EOS and CSD EOS
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