Pure refrigerants thermal conductivity prediction in a corresponding states format

A three parameters Corresponding States model is here developed importing methods formerly studied for the volumetric representation of fluids. Two fluids of the same conformal family are chosen both for their acentric factor value and for the thermal conductivity dedicated equations availability. On the basis of the Teja et al. three parameters CS model for volumetric properties, the reduced thermal conductivity of a third fluid of the family is obtained in reduced P,T utilising, in a first extent, the Pitzer acentric factor as third parameter. The acentric factor is verified to be not suitable as scaling factor for generalised thermal conductivity, also because of inconsistency of its argument with transport properties. Two new scaling factors are then assumed to replace Pitzer acentric factor, one for the liquid phase and the other for the vapour phase. These are the only model inputs, allowing the model to predictively calculate thermal conductivity over the whole (P,?,T) domain. The model is here applied to hydrocarbons and HFC refrigerants, included fluoropropanes. Considering the predictive nature of the model and the scattering of the experimental data sets, the obtained mean accuracy is very good and particularly satisfactory for technical application requirements.