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Simulation on vapor liquid equilibria of R1234yf/R290/R134a ternary system.

[In Chinese. / En chinois.]

Author(s) : QIN Y., ZHANG H., WU Y.

Type of article: Article

Summary

Based on the Peng Robinson (PR) equation of state combined with the Wong-Sandler (WS) mixing rule , and combined with the UNIFAC group contribution method used in the Predictive Soave Redlich Kwong (PSRK) equation, a gas-liquid equilibrium prediction model of the mixture (PRWS-UNIFAC-PSRK) was constructed. The results indicate that for the R32/ R1234yf/R600a binary mixture, the deviations between the experimental and calculated data for the pressure and vapor 's phase mass fraction are within ?2.5% and 0.02, respectively. For R134a/RI234 yf/R600a ternary mixture,the relative deviation between the measured pressures and calculated results are within ?3% and the absolute deviation of vapor phase mass fraction is within ?0.04. In ternary phase equilibria diagram of R1234yf/R290/R134a, the mass fraction of R1234yf/R290/ R134a at around 0.25/0.7/0.05 has an azeotropic point. The VLE (vapor liquid equilibria) prediction model can be further improved by using the multi-parameler equation of states, improving the activity coefficient models and obtaining more accurate binary interaction coefficient.

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Pages: 29-40

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