Experimental and Numerical Study on Thermal Hydraulic Performance of Trapezoidal Printed Circuit Heat Exchanger for Supercritical CO2 Brayton Cycle

The supercritical carbon dioxide (sCO2) Brayton cycle is the preferred power for future nuclear energy, fossil solar and other energy systems. As regenerator in cycle, printed circuit heat exchanger (PCHE) exhibits a high transfer efficiency, compactness, robustness. structure design of its internal flow channel one most important factors to enhance reduce pressure loss. In present work, trapezoidal PCHE prototype designed manufactured, thermal-hydraulic performance as experimentally studied sCO2 test loop. overall coefficient exceeds 1.10 kW/(m2·K) reaches maximum 2.53 with changes inlet temperature, working pressure, mass rate. Correlations Nusselt numbers are proposed on both sides, Reynolds ranging from 10,000 30,000 4800 14,000, Prandtl 0.91 1.61 0.77 0.98 cold side hot side, respectively. drop channels calculated by peeling method using single-plate straight less than 7 kPa 15 recovery efficiency analyzed evaluate regenerator. Finally, simulation works carried out verify experimental results expand 3796 1821 This work provides methods correlations development an efficient cycle.