Comprehensive evaluation on the thermal-hydraulic performance of supercritical CO2/R41 in a micro-fin tube

A 3-D flow and heat transfer theoretical model was established for a 5 mm micro-fin tube to explore the characteristics of supercritical CO2/R41 therein under different pressures, mass fluxes, components. The research attempts provide reference selecting components working media setting pressure flux in application scenarios. Results show that closer temperature medium critical temperature, larger local convective coefficient (CHTC). CHTC at is 8 16 times higher compared with non-critical temperature. maximum greater corresponding lower when mixed pressure. 7.0 MPa twice 8.0 MPa. As increases from 400 800 kg/m2s, by 1.7 times, while comprehensive evaluation results drop decrease significantly. When CO2 fraction 20.5% 75%, increased 2.6 times.