CORRELATION FOR THERMAL CONDUCTIVITY OF HFOS AND HFO/HFC MIXTURES BASED ON FRICTION THEORY

Hydrofluoroolefins (HFOs) are a category of environment-friendly refrigerants. The characteristics of HFOs and HFO/HFC mixtures have been more and more widely studied. Thermal conductivity is an important transport property in fluid flow and heat transfer. Therefore, it is necessary to model the thermal conductivity of HFOs and HFO/HFC mixtures. In this work, the experimental data of thermal conductivity of HFOs were correlated by the friction theory (FT) and the PR equation of state, and the overall ARD is 1.86%. To predict the thermal conductivity of HFO/HFC mixtures, thermal conductivity models of R32, R125, R134a and R143a were also established. The thermal conductivities of HFO/HFO and HFO/HFC mixtures were predicted using the linear mixing rule. The overall ARD of the predicted thermal conductivity with the experimental data is 3.99%. It is obvious that the FT+PR model can provide accurate correlations for thermal conductivity of pure HFOs and HFCs, and provide good predictions for the thermal conductivity of HFO/HFO and HFO/HFC mixtures.