Semi-Empirical Evaluation of Viscosity Coefficients for Refrigerant Mixtures: R410A, R421B and R125+R134a at Moderate Density Regimes

Mixed refrigerants such as R410A and R421B are recommended as replacements for R22 andR502, due to being non-toxic, non-flammable and environmentally green refrigerants.Reliable viscosity data for these refrigerants are prerequisite for the design of refrigerationequipment using refrigerant blends; particulary for the design of condenser and evaporator.This study aims to calculate viscosity coefficients for R410A (xR32=0.6976; xR125=0.3024);R421B (XR125=0.8281; XR134a=0.1718) and R125+R134a (xR125=0.7510; xR134a=0.249)refrigerant mixtures, at moderate density regimes, employing the Vesovic-Wakeham (VW)method [1].