Thermal conductivity and thermal diffusivity of the refrigerant mixtures R507, R404A, R410A, and R407C
Avsec, Jurij ...
The paper presents a mathematical model for the computation of the thermal conductivity and thermal diffusivity of fluid mixtures in the low density region up to saturation conditions over a wide ...temperature range approaching the liquid-vapor critical point. Our special interest is focused on systems containing polyatomic molecules whereby the refrigerant mixtures of technical importance R404A, R507, R410A, and R407C are object of our investigations. The model for the calculation of the thermal conductivity is based on the kinetic gas theory, and equations for the transport coefficients are correlated with experimental data. The transport properties at high density are obtained from the region at low-pressure by the use of density-sensitive functions which are empirically correlated. In these correlations we consider the acentric factor, dipole moment, molecular structure, polarity, and the hydrogen bonding effect. To take into consideration the rotational effect, we use a correction factor on the basis of a elastic smooth-sphere model. For data comparison the theoretical results for the thermal conductivity are converted to thermal diffusivity using values for the density and specific heat capacity at constant pressure. For this, a model based on kinetic theory, is applied. The model for the calculation of the equilibrium properties of the refrigerant mixtures studied in this work contains all important molecular contributions, e.g., translation, rotation, internal rotation, vibration, intermolecular potential energy, and the influence of electron and nuclei excitation. The analytical results for the thermal diffusivity are in excellent agreement with the experimental data from dynamic light scattering (DLS).
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