N2 - The paper presents an efficiency analysis of two transcritical CO2 power cycles with regenerative heaters. For the proposed cycles, calculations of thermal efficiency are given for selected values of operating parameters. It was assumed that the highest working temperature and pressure are in the range from 600 to 700 °C and 40 to 50 MPa, respectively. The purpose of the calculations was optimization of the pressure and mass flows in the regenerative heaters to achieve maximum cycle efficiency. It follows that for the assumed upper CO2 parameters, efficiency of 51-54% can be reached, which is comparable to the efficiency of a supercritical advanced power cycle considered by Dostal. L1 - http://journals.pan.pl/Content/94451/PDF/14_paper.pdf L2 - http://journals.pan.pl/Content/94451 PY - 2013 IS - No 3 September EP - 217 DO - 10.2478/aoter-2013-0025 KW - CO2 thermodynamic cycle KW - thermal efficiency KW - Near-critical region KW - Heat regeneration A1 - Kwidziński, Roman A1 - Trela, Marian A1 - Butrymowicz, Dariusz PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2013 T1 - A study of transcritical carbon dioxide cycles with heat regeneration SP - 197 UR - http://journals.pan.pl/dlibra/publication/edition/94451 T2 - Archives of Thermodynamics