Investigation of heat transfer based supercritical fluid through confined flow

In this research, the supercritical carbon dioxide (SC-CO2) Brayton cycle technique was examined as part of continuous research for SC-CO2. This work introduces an empirical implementation of the heat transfer behaviours of SC-CO2 in a confined flow. The heat exchanger is designed with dimensions of 34×30×5 millimetres. The experimentations were carried out with intake heat levels ranging from 30 to 110 degrees Celsius, pressures scaling from 7.5 to 11.5 MPa, mass fluxes scaling from 50 to 200 kg/m2s, and heat fluxes scaling from 5 to 110 kW/m2. The outcomes showed significant changes in thermal performance in the micro-channel at relatively low fluxes when various degrees of heat flux (HF) are applied. Also, at relatively low fluxes, buoyancy plays an important part in heat transfer, particularly when strong heat fluxes are present while, in the relatively-critical zone, increased heat transfer ratios were reached. Finally, the network pressure, mass flow rate and CO2 heating level all contributed to having a high influence on heat exchange.