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Sustainability 2016, 8(10), 1079; doi:10.3390/su8101079

Thermoeconomic Analysis and Optimization of a New Combined Supercritical Carbon Dioxide Recompression Brayton/Kalina Cycle

1
Faculty of Mechanical Engineering, University of Tabriz, Tabriz 51666-16471, Iran
2
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, ON L1H 7K4, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Barry D. Solomon
Received: 4 September 2016 / Revised: 13 October 2016 / Accepted: 17 October 2016 / Published: 24 October 2016
(This article belongs to the Section Energy Sustainability)
View Full-Text   |   Download PDF [1945 KB, uploaded 24 October 2016]   |  

Abstract

A new combined supercritical CO2 recompression Brayton/Kalina cycle (SCRB/KC) is proposed. In the proposed system, waste heat from a supercritical CO2 recompression Brayton cycle (SCRBC) is recovered by a Kalina cycle (KC) to generate additional electrical power. The performances of the two cycles are simulated and compared using mass, energy and exergy balances of the overall systems and their components. Using the SPECO (Specific Exergy Costing) approach and employing selected cost balance equations for the components of each system, the total product unit costs of the cycles are obtained. Parametric studies are performed to investigate the effects on the SCRB/KC and SCRBC thermodynamic and thermoeconomic performances of key decision parameters. In addition, considering the exergy efficiency and total product unit cost as criteria, optimization is performed for the SCRBC and SCRB/KC using Engineering Equation Solver software. The results indicate that the maximum exergy efficiency of the SCRB/KC is higher than that of the SCRBC by up to 10%, and that the minimum total product unit cost of the SCRB/KC is lower than that of the SCRBC by up to 4.9%. View Full-Text
Keywords: recompression supercritical carbon dioxide cycle; Kalina cycle; exergy analysis; thermoeconomics; optimization recompression supercritical carbon dioxide cycle; Kalina cycle; exergy analysis; thermoeconomics; optimization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

S. Mahmoudi, S.M.; D. Akbari, A.; Rosen, M.A. Thermoeconomic Analysis and Optimization of a New Combined Supercritical Carbon Dioxide Recompression Brayton/Kalina Cycle. Sustainability 2016, 8, 1079.

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