Comparative energy and exergy analysis and optimisation study on the supercritical CO2recompression power cycle

Gumus E., Bashan V.

International Journal of Exergy, vol.32, no.2, pp.130-149, 2020 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1504/ijex.2020.108170
  • Journal Name: International Journal of Exergy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.130-149
  • Keywords: Carbondioxide, Exergy analysis, Recompression cycle, S-CO2, Supercritical, Thermodynamic analysis
  • Istanbul Technical University Affiliated: No


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.