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

Evaluating the solid–liquid equilibrium and the eutectic composition of a mixture is fundamental for the estimation of the lowest temperature at which the blend can be used as a refrigerant fluid. The study on the solid–liquid equilibrium for some selected systems was undertaken to fill the gap in the literature on the solid–liquid equilibrium of alternative refrigerants. A new experimental set-up was used and the system’s behavior was measured down to temperatures of 130 K for three binaries, i.e. CO2+N2O, CO2+R32 and N2O+R32. The set-up enabled us to record not only temperature and composition, but also pressure data. The triple points of the pure fluids contained in the mixture were measured to check the reliability of the new apparatus, revealing a good consistency with the literature. The results obtained for the mixtures were interpreted by means of the Schroeder equation.