Solid–liquid equilibria for the CO2+N2O, CO2+R32, and N2O+R32 systems

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

doi:10.1016/j.fluid.2006.11.015

Cited by 20 publications

(36 citation statements)

References 14 publications

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“…From the T-x data it is evident that N 2 O + R23 forms a eutectic (x 1 = 0.08 at T = 115 K). Per analogy to other studied CO 2 + HFC systems [1][2][3], it is expected that the CO 2 + R23 forms a eutectic as well in the very dilute region. However, due to the very dilute composition range, this assumption could not be validated experimentally.…”

Section: Resultsmentioning

confidence: 66%

“…1. It is the same as already described elsewhere [1][2][3], so it will be only briefly described here. The measuring cell (1), with a volume of approximately 47 cm 3 , was made out of a stainless-steel cylinder.…”

Section: Description Of the Apparatusmentioning

confidence: 99%

“…Hence, a set-up was specifically built [1] avoiding the need of visual observation of phase behavior. Recently, this set-up was used to study the SLE of the CO 2 + R125 and N 2 O + R125 systems [1], CO 2 + N 2 O, CO 2 + R32, and N 2 O + R32 systems [2], and CO 2 + R152a and N 2 O + R152a systems [3]. In this paper, the system's behavior was measured down to temperatures of 117 K for two binaries, i.e., CO 2 + R23 and N 2 O + R23.…”

Section: Introductionmentioning

confidence: 99%

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Solid–Liquid Equilibria for the CO2 + R23 and N2O + R23 Systems

et al. 2008

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A recently built experimental set-up was employed for the estimation of the solid-liquid equilibria of alternative refrigerant systems. In this paper two binaries, i.e., carbon dioxide + trifluoromethane (CO 2 + R23) and nitrous oxide + trifluoromethane (N 2 O + R23), were studied down to temperatures of 117 K. In order to check the reliability of the apparatus, the triple points of the pure fluids contained in the mixture were measured, revealing good consistency with the literature.The results obtained for the mixtures were interpreted by means of the Schröder equation.

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Section: Resultsmentioning

confidence: 66%

Section: Description Of the Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid–Liquid Equilibria for the CO2 + R23 and N2O + R23 Systems

et al. 2008

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“…For carbon dioxide and nitrous oxide, results are presented elsewhere [1,2]. The tests conducted showed that a faster cooling rate coincided with a greater supercooling effect.…”

Section: Pure Fluidsmentioning

confidence: 99%

“…In previous studies [1][2][3], using the first version of the experimental setup, together with the properties of the CO 2 + N 2 O binary system [2], SLE of CO 2 + and N 2 O + four different HFCs (R125, R32, R134a, and R152a) were explored. The main motivation for these binaries lies in the possibility to combine the advantages of natural fluids in terms of low environmental impact (i.e., GWP = 1 for CO 2 and GWP = 310 for N 2 O, which can be considered low if compared with HFCs) together with those of HFCs in terms of performance and of the possibility to extend the temperature application limit.…”

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Solid–Liquid Equilibria for the CO2 + R143a and N2O + R143a Systems

et al. 2009

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A recently built experimental setup for determination of solid-liquid equilibria was slightly modified. The action taken on the existing system focused on correcting the drawbacks of the cooling system. In this version of the setup, a direct liquid nitrogen supply was preferred. By means of the modified apparatus, solid-liquid equilibria of the CO 2 + R143a and N 2 O + R143a binary systems were studied. The triple point of R143a was measured to check the reliability of the modified apparatus, revealing good consistency with the literature. The system's behavior was measured down to temperatures of 148 K. The results obtained for the mixtures were interpreted by means of the Schröder equation.

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Cryogenic Solid Solubility Measurements for HFC-32 + CO2 Binary Mixtures at Temperatures Between (132 and 217) K

et al. 2023

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Accurate phase equilibrium data for mixtures of eco-friendly but mildly-flammable refrigerants with inert components like CO2 will help the refrigeration industry safely employ working fluids with 80 % less global warming potential than those of many widely-used refrigerants. In this work, a visual high-pressure measurement setup was used to measure solid–fluid equilibrium (SFE) of HFC-32 + CO2 binary systems at temperatures between (132 and 217) K. The experimental data show a eutectic composition of around 11 mol % CO2 with a eutectic temperature of 131.9 K at solid–liquid–vapour (SLVE) condition. Measured SLVE and solid–liquid equilibrium data were used to tune a thermodynamic model implemented in the ThermoFAST software package by adjusting the binary interaction parameter (BIP) in the Peng–Robinson equation of state. The tuned model represents the measured melting points for binary mixtures with a root mean square deviation (RMSD) of 3.2 K, which is 60 % less than achieved with the default BIP. An RMSD of 0.5 K was obtained using the tuned model for the mixtures with CO2 fractions over 28 mol % relative to an RMSD of 3.4 K obtained with the default model. The new property data and improved model presented in this work will help avoid solid deposition risk in cryogenic applications of the HFC-32 + CO2 binary system and promote wider applications of more environmentally-friendly refrigerant mixtures.

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Solid–liquid equilibria for the CO2+N2O, CO2+R32, and N2O+R32 systems

Cited by 20 publications

References 14 publications

Solid–Liquid Equilibria for the CO2 + R23 and N2O + R23 Systems

Solid–Liquid Equilibria for the CO2 + R23 and N2O + R23 Systems

Solid–Liquid Equilibria for the CO2 + R143a and N2O + R143a Systems

Cryogenic Solid Solubility Measurements for HFC-32 + CO2 Binary Mixtures at Temperatures Between (132 and 217) K

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