First and Second Law Analysis of Supercritical CO2 Recompression Brayton Cycle


  • Muhammad Sajid Khan Eastern Mediterranean University, Famagusta TRNC via Mersin 10, Turkey
  • Ugur Atikol Eastern Mediterranean University



The present research concentrates on the energy and exergy analysis of the S-CO2 recompression Brayton cycle and the individual components irreversibilities by varying the different operating parameters. Results show that the cycle efficiencies and LTR effectiveness reduce by increasing minimum cycle temperature, but HTR increases. The effect of minimum cycle temperature is more critical on cycle performance than maximum cycle temperature. The reactor has the highest irreversibility followed by recuperators and pre-cooler. Exergy efficiency shows a downward trend as environment temperature enhances. However, the effect of turbine inlet temperature is very low on-cycle efficiency and optimum pressure ratio for lower compressor outlet pressure values, which is more significant by increasing this parameter.

Author Biographies

Muhammad Sajid Khan, Eastern Mediterranean University, Famagusta TRNC via Mersin 10, Turkey

Masters in Mechanical Engineering

Ugur Atikol, Eastern Mediterranean University

Professor in Mechanical Engineering Department


Feher EG. The supercritical thermodynamic power cycle. Douglas Paper No.4348. In: Proceedings of the IECEC, Florida; 1967.

ASHRAE. ASHRAE 15-2013, ASHRAE; 2013.

Angelino G. Real gas effects in carbon dioxide cycles. ASME Paper No. 69-GT-103; 1969.

Turchi C, Ma Z, Dyreby J. Supercritical CO2 for application in concentrating solar power systems. In: Proceedings of supercritical CO2 power cycle symposium; 2009.

Turchi CS, Ma Z, Neises TW, Wagner MJ. Thermodynamic study of advanced supercritical carbon dioxide power cycles for concentrating solar power systems. J Sol Energy Eng 2013;135(4):041007.

Sulzer G. Process for generating work from heat (in Swiss). Swiss Patent CH 269599; 15 July 1950.

Feher EG. The supercritical thermodynamic power cycle. Energy Convers 1968;8:85e90 [Printed in Great Britain].

Dostal V, Driscoll MJ, Hejzlar P. A supercritical carbon dioxide cycle for next generation nuclear reactors. MIT-ANP-TR-100. March; 2004.

Sarkar J. Second law analysis of supercritical CO2 recompression Brayton cycle. Energy 2009;34:1172e8.

Sarkar J, Bhattacharyya S. Optimization of recompression S-CO2 power cycle with reheating. Energy Convers Manage 2009;50:1939e45.

Akbari AD, Mahmoudi SMS. Thermoeconomic analysis & optimization of the combined supercritical CO2 (carbon dioxide) recompression Brayton/organic Rankine cycle. Energy 2014;78:501-12.

Span R, Wagner W. A new equations of state for Carbon dioxide covering the fluid region from triple point temperature to 1100 K at pressure up to 800 MPa. J Phys Chem Ref Data 1996;25:1509–96.






Engineering Sciences