Experimental study on convective heat transfer of S–CO2 under high heat flux

Since the S–CO2 power cycle is of great significance for energy development, in which the design of various vital components involves the heat transfer of S–CO2 at different temperatures and pressures, many researchers have conducted experimental research on the convective heat transfer characteristics of S–CO2. However, as the existing studies primarily focused on low heat flux conditions, there are some gaps in the high heat flux experimental data. In this study, by building an experimental facility, the heat transfer characteristics of S–CO2 in the range of heat flux from 500 kW/m2 to 1000 kW/m2 were studied, and the heat transfer correlation under high heat flux was fitted based on the experimental data. The results have revealed that the heat transfer of S–CO2 under high heat flux differs from that of low heat flux, and the existing empirical correlations have more significant errors under high heat flux. The newly proposed heat transfer correlation has the highest calculation accuracy, which calculates 94% of experimental data within ±30% error. It can meet the actual engineering needs.