New Correlation Model of Thermal Conductivity of Liquid Hydrofluorochloro Derivatives of Olefins, Hydrofluorocarbons, and Hydrochlorofluorocarbons

Abstract

The correlation dependence of thermal conductivity \({{\lambda }_{{\text{s}}}}\) of liquid refrigerants on the saturation line is developed as a simple function of temperature \(T\): \({{\lambda }_{{\text{s}}}}{\text{/}}{{\lambda }_{0}} = {{(1 + \tau )}^{2}} + A{{\tau }^{{ - \chi }}}\) (where \({{\lambda }_{0}}\) is the criterion unit, \(\tau = 1 - T{\text{/}}{{T}_{{\text{c}}}}\), and \({{T}_{{\text{c}}}}\) is the critical temperature). This dependence satisfies the requirements of dynamic scale theory (ST), and in particular, the passage to the limit \({{\lambda }_{{\text{s}}}}(T \to {{T}_{{\text{c}}}}) \to + \infty \). The proposed correlation dependence is tested using the example of describing the thermal conductivity of 17 liquid substances in the range of state parameters from the saturation line to the critical pressure \({{p}_{{\text{c}}}}\) and in the temperature range from the triple point temperature T_tr to \({{T}_{{\text{c}}}}\). The substances reviewed include nine fourth-generation refrigerants of hydrofluorochloro derivatives of olefins, seven hydrochlorofluorocarbons and hydrofluorocarbons, and C₃H₈. Using the description of \({{\lambda }_{{\text{s}}}}\) of C₃H₈ as an example, it is shown that the proposed correlation dependence not only qualitatively but also quantitatively accurately conveys the behavior of \({{\lambda }_{{\text{s}}}}\) in the vicinity of the critical point. Based on the statistical analysis, it is shown that the proposed correlation with significantly less uncertainty describes the data on the thermal conductivity of liquid hydrofluorochloro derivatives of olefins both on the saturation line and in the single-phase region. Based on the proposed methodology, the thermal conductivity of the cis-isomer R1225ye(Z) is calculated for the first time in the temperature range \(134.3\,\,{\text{K}} \leqslant T \leqslant 373.15\,\,{\text{K}}\).