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Publication Title | A study of transcritical carbon dioxide cycles with heat regeneration

Organic Rankine Cycle

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archives of thermodynamics

Vol. 34(2013), No. 3, 197–217 DOI: 10.2478/aoter-2013-0025

A study of transcritical carbon dioxide cycles with heat regeneration

MARIAN TRELA1∗

ROMAN KWIDZIŃSKI2 DARIUSZ BUTRYMOWICZ2

1 University of Warmia and Mazury, Faculty of Technical Sciences, Oczapowskiego 11, 10-719 Olsztyn, Poland

2 The Szewalski Institute of Fluid Flow Machinery of the Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

Abstract The paper presents an efficiency analysis of two transcriti- cal 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 pres- sure are in the range from 600 to 700 oC 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 fol- lows 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.

Keywords: CO2 thermodynamic cycle; Near-critical region; Heat regeneration; Thermal efficiency

Nomenclature

a,g – cp –

mass flow fraction

h l p

specific heat at constant pressure, J/kgK

– specific enthalpy, J/kg

– unit work, J/kg

– pressure, Pa

∗Corresponding Author. E-mail: mtr@imp.gda.pl

Unauthenticated Download Date | 6/2/16 5:57 PM

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