Comparative energy and exergy analysis and optimisation study on the supercritical CO_2 recompression power cycle

摘要

The current study aims at optimisation and comparing the recuperative s-CO_(2)cycle with the re-compression s-CO_(2)cycle in case of changes in turbine and compressor isentropic efficiency and TITs. Below 317°C the TIT recuperated Brayton cycle (RBC) has a higher cycle efficiency than RCBC for the case where compressor efficiency is 75% and turbine efficiency is 80%. RBCs with having higher turbomachinery efficiencies ( η_(c) = 85%, η_(t) = 90%) have higher cycle thermal efficiency than RCBCs with lower turbomachinery efficiencies ( η_(c) = 75%, η_(t) = 80%). These results will remedy the gap in the literature on information for selecting the appropriate cycle for various purposes under certain thermodynamic inlet conditions.