New equation of state for transport properties: calculation for the thermal conductivity and the viscosity of halogenated hydrocarbon refrigerants

• Published in: Fluid phase equilibria 2002-09, Vol.201 (2), p.309-320
• Main Authors: He, Mao-Gang, Liu, Zhi-Gang, Yin, Jian-Min
• Format: Article
• Language: English
• Subjects: Applied sciences; Correlation; Energy; Energy. Thermal use of fuels; Equation of state; Exact sciences and technology; Halogenated hydrocarbon refrigerants; Method of calculation; Refrigerants; Refrigerating engineering; Refrigerating engineering. Cryogenics. Food conservation; Thermal conductivity; Transport equation of state; Viscosity
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/S0378-3812(02)00075-4

A new transport equation of state to estimate the thermal conductivity and the viscosity of the dense fluid for halogenated hydrocarbon refrigerants is presented and the relationships between the reduced residual transport properties and the reduced density were determined. This approach originated from the phenomenological similarity between the reduced residual transport properties and the reduced density in terms of pressure and temperature over the entire thermodynamic surface. The new equation can be used to calculate the thermal conductivity and the viscosity of the dense fluid including the vapor and liquid region with high accuracy, based on the calculation on the transport properties of gases at low pressure. The only input data needed are the critical parameters, molecular weight and acentric factor. The method is based on the concept of the transport equation of state describing the transport properties in terms of pressure and temperature by pressure explicit equations similar to a thermal equation of state. Coherence between the transport properties and equilibrium properties over the entire fluid range was reflected. The absolute average deviation of the thermal conductivity of halogenated hydrocarbon refrigerants is 4.8% with a maximum deviation of 18.0%, and the absolute average deviation of the viscosity of halogenated hydrocarbon refrigerants is 4.4% with a maximum deviation of 15.6%, using the new equation. A new generalized correlation to estimate the thermal conductivity of halogenated hydrocarbon refrigerants at low pressure is also proposed. The range of application of this new formula is for reduced temperatures between 0.6 and 1.2 and for values of the critical compressibility factor between 0.225 and 0.283. The calculation deviation is within ±7%, and the total absolute average deviation is 2.7% compared with the experimental data.