Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Abstract

The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternative to replace conventional R134a, which can be beneficial for climate change. A considerable suggestion is R515A which possesses considerably lower global warming potential. The present simulations are designed to study supercritical fluid R515A under cooling conditions in horizontal position. The effect of pressure, mass flux, heat flux and tube diameter were considered for horizontal tube in the vicinity of pseudo critical temperature. Numerical investigations on heat transfer characteristics of supercritical fluid R515A were performed using widely used shear-stress transport (SST) model. Moreover, heat transfer correlations were developed and suggested to accurately predict Nusselt number within 10% accuracy. The simulation results showed about 3.98% average absolute deviation.

Current status of the thermohydraulic behavior of supercritical refrigerants: A review

“…As a continuation of the previous study, Ibrahim et al [88,89] published two works about numerical work on supercritical cooling as well. In the first work [88], R515A (blend of R1234ze and R227ea) was studied. The same working conditions (G, q) as in the simulations of Jiang et al [87] apply.…”