Modeling and Energetic Analysis of a Supercritical Carbon Dioxide sCO2 Recompression-Organic Rankine Cycle Integrated to a Central Tower Receiver

This study presents a comprehensive thermodynamic model and energetic analysis of a hybrid Concentrated Solar Power (CSP) system incorporating a supercritical carbon dioxide (sCO2) Brayton cycle and an Organic Rankine Cycle (ORC). The CSP system uses a central tower receiver with a fluidized bed of silicon carbide particles and air as the heat transfer medium. Operating at a temperature of 650°C, the system demonstrates a heat transfer coefficient of 411 W/m2K. Key findings highlight the sensitivity of the convective coefficient to gas velocity and the effect of particle mass flow on receiver efficiency. Fuel mass flow reductions of up to 3.7% were achieved through particle mass flow adjustments, while variations in compression ratio and steam turbine inlet temperature affected overall cycle performance and efficiency. The study highlights the potential of such integrated systems to improve thermal efficiency, although further optimization is needed to balance fuel consumption and environmental impact.