An Overview of Heat Transfer Correlations for Supercritical CO2 Cooling in Macro-channels

Recently, due to the rapid development of the supercritical water-cooled reactor, trans-critical CO2 heat pump and other technologies, there has been an increasing interest in accurate prediction of convective heat transfer coefficient of supercritical CO2 under cooling conditions. The main aim of this paper is to give a concise review of heat transfer correlations for supercritical CO2 cooling in macro-channels (inner diameter larger than 3 mm). Before that the fundamental knowledge about convective heat transfer is first addressed, with an emphasis on heat transfer coefficient.