Measurement and Prediction Evaluation of Viscosity of Low GWP Mixtures R454B and R454C

抄録

This article investigates the experimental viscosity data and modeling of two binary refrigerant mixtures, R454B and R454C, recognized as low global warming potential (GWP) alternatives to conventional high-GWP refrigerants. Viscosity was measured for both refrigerants in liquid and vapor phases using a tandem capillary tube method. For R454B, the viscosity measurements spanned temperatures from (233 to 313) K in the liquid phase and (323 to 373) K in the vapor phase, under pressures up to 4.07 MPa. For R454C, measurements were taken from (233 to 343) K in the liquid phase and from (343 to 393) K in the vapor phase, with pressures reaching 4.01 MPa. The research used two sets of experiments focusing on low (233 to 293) K and high (303 to 393) K temperature ranges, adhering to the same measurement principles. The expanded uncertainties for viscosity in liquid and vapor phases were kept below 2.2% and 2.4%, respectively. Furthermore, prediction of viscosity of the two mixtures has been carried out using Extended Corresponding States (ECS) that comes with REFPROP version 10.0. It was observed that for vapor phase viscosity predicted by REFPROP is higher than the experimental value, especially for R454C.