PVTx measurements for N2O+CH3F, N2O+CH2F2, and N2O+CHF3 binary systems

Nicola, Giovanni Di; Giuliani, Giuliano; Polonara, Fabio; Stryjek, Roman

doi:10.1016/j.fluid.2004.11.021

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Our PVTx measurements by the isochoric methods for the respective CO 2 + HFCs and N 2 O + HFCs systems − at temperatures higher than SLE data showed that systems are showing small positive deviations in terms of Raoult's law; a very few additional VLE data from the literature for some CO 2 + HFCs, − measured at an even much higher temperature range than our data, showed a little bit greater but also positive deviations from Raoult's law. A comparable analysis of deviations from Raoult's law of all existing data for systems was considered (VLE and our isochoric) and showed that they have a slight trend of decreasing with the lowering of temperature.…”

Section: Representation Of the Liquidus By The Schröder Equationsupporting

confidence: 42%

“…The experimental isochoric and SLE data were obtained by experimental apparatuses presented elsewhere. [1][2][3][4][5][6][7][9][10][11][12][13][14] The information on the SLE data measurements along with the VLE data for corresponding binaries measured by the isochoric method is presented in Table 1. From the Table 1, it is easily evident that the temperatures of isochoric PVTx in two-phase region data are covering a higher temperature range than SLE data for which, obviously, the upper limit of temperature corresponds to the melting temperature of the solute or solvent, whatever is higher.…”

Section: Experimental Data Discussionmentioning

confidence: 99%

“…The systematic study covered the experimental measurements of solid-liquid equilibria (SLE) of CO 2 and N 2 O + HFCs (R32, R125, R134a, R143a, R152a, R23, and R41) [1][2][3][4][5][6][7] by the Rossini method 8 and, finally, of PVTx by the isochoric method. [9][10][11][12][13][14] The PVTx data in the two-phase region enable VLE parameters to be derived using a flash method with the Carnahan-Starling-De Santis equation of state (CSD EOS). 15 In this work, the SLE measurements were reinterpreted, also in the light of the vapor-liquid equilibria (VLE) assessments from the isochoric data.…”

Section: Introductionmentioning

confidence: 99%

“…As the second system's component, a series of the hydrofluorocarbons (HFCs) were chosen. The systematic study covered the experimental measurements of solid−liquid equilibria (SLE) of CO 2 and N 2 O + HFCs (R32, R125, R134a, R143a, R152a, R23, and R41) − by the Rossini method and, finally, of PVTx by the isochoric method. − The PVTx data in the two-phase region enable VLE parameters to be derived using a flash method with the Carnahan−Starling−De Santis equation of state (CSD EOS) …”

Section: Introductionmentioning

confidence: 99%

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Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

2010

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The present paper summarizes and reinterprets the results for a series of measurements of solid−liquid equilibria for binary systems formed by carbon dioxide or nitrous oxide with a series of hydrofluorocarbons (fluoromethane, difluoromethane, trifluoromethane, pentafluoromethane, 1,1,1,2-tetrafluoroethane, 1,1,1-trifluoroethane, and 1,1-difluoroethane). All of the systems form eutectics. The contribution from heat capacity and activity coefficients to the liquidus courses represented by the Schröder equation were analyzed for each system included in the present study. The performed analysis showed that both mentioned contributions are small and, to a great extent, are mutually compensating each other and thus could be disregarded. The results showed that, for the systems under study, the liquidus curve down to the eutectic point may be represented by the Schröder equation involving two quantities only: the temperature at triple point and the enthalpy of fusion of the system components.

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Section: Representation Of the Liquidus By The Schröder Equationsupporting

confidence: 42%

Section: Experimental Data Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Liquidus in the CO₂ + and N₂O + Hydrofluorocarbon Systems

2010

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“…Vapor-liquid equilibria (VLE) derived from our previous isochoric measurements for the binaries under study witnessed that the two systems showed an almost ideal behavior in terms of the Raoult's law. 8,9 The exact course of the liquidus for mixtures showing a small deviation from Raoult's law depends mainly on the enthalpy of fusion of the solute (CO 2 and N 2 O in our case).…”

Section: Interpretation Of the Resultsmentioning

confidence: 83%

Carbon Dioxide + Fluoromethane and Nitrous Oxide + Fluoromethane: Solid−Liquid Equilibria Measurements

et al. 2010

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A recently built experimental setup was employed for the estimation of the solid-liquid equilibria of alternative refrigerants systems. The behavior of two binaries, i.e. carbon dioxide + fluoromethane (CO 2 + R41) and nitrous oxide + fluoromethane (N 2 O + R41), was measured down to temperatures of 126.5 K. To confirm the reliability of the apparatus, the triple points of the pure fluids constituent the binary systems were measured. All triple point data measured revealed a generally good consistency with the literature. The results obtained for the mixtures were corrected by the Rossini method and interpreted by means of the Schröder equation.

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