Title: Comparative energy and exergy analysis and optimisation study on the supercritical CO2 recompression power cycle

Authors: Emrah Gumus; Veysi Bashan

Addresses: College of Engineering and Technology, American University of the Middle East, Kuwait ' Department of Naval Architecture and Marine Engineering, Faculty of Naval Architecture and Maritime, Yildiz Technical University, Istanbul 34349, Turkey

Abstract: The current study aims at optimisation and comparing the recuperative s-CO2 cycle with the re-compression s-CO2 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 (ηc = 85%, ηt = 90%) have higher cycle thermal efficiency than RCBCs with lower turbomachinery efficiencies (ηc = 75%, ηt = 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.

Keywords: recompression cycle; supercritical; s-CO2; carbondioxide; thermodynamic analysis; exergy analysis.

DOI: 10.1504/IJEX.2020.108170

International Journal of Exergy, 2020 Vol.32 No.2, pp.130 - 149

Received: 02 Jul 2019
Accepted: 14 Dec 2019

Published online: 29 Jun 2020 *

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