PREDICTION AND CALCULATION OF AZEOTROPIC’S BEHAVIOURS ON THE BASIS OF CUBIC EQUATION OF STATE
DOI:
https://doi.org/10.18198/j.ind.gases.2003.0076Keywords:
azeotropic mixtures, prediction of azeotropy, thermodynamic properties, equation of state, mixing rules, correlation parametersAbstract
The azeotropic binary mixtures are effective working substances for various refrigerators, including low-temperature ones. Their experimental finding and investigation is the complicated and labour-intensive problem. That problemrestrains more practical application of azeotropic mixtures in cooling systems. The problems of prediction and modeling of azeotropic behaviours with the help of two-parametric cubic equations of a state are considered. Using the maxwell line method, the conditions of azeotropy expressed through parameters of the equation of state are obtained. The results of prediction of the azeotropic points for binary systems from van-der-Waals, Redlich-Kwong-Wilson and Peng-Robinson equations of a state have been obtained and analyzed. The values of correlation parameters for some binary mixtures used in refrigerating engineering are represented.
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