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Processes 2018, 6(9), 153; https://doi.org/10.3390/pr6090153

Energy and Exergy Analysis of the S-CO2 Brayton Cycle Coupled with Bottoming Cycles

1
Mechanical Engineering Department, King Abdul Aziz University, Jeddah 21589, Saudi Arabia
2
Department of Materials and Chemical Engineering, Ghulam Ishaq Khan Institute of Engineering and Technology, Topi 23640, Pakistan
*
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 23 August 2018 / Accepted: 28 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Modeling and Simulation of Energy Systems)
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Abstract

Supercritical carbon dioxide (S-CO2) Brayton cycles (BC) are soon to be a competitive and environment friendly power generation technology. Progressive technological developments in turbo-machineries and heat exchangers have boosted the idea of using S-CO2 in a closed-loop BC. This paper describes and discusses energy and exergy analysis of S-CO2 BC in cascade arrangement with a secondary cycle using CO2, R134a, ammonia, or argon as working fluids. Pressure drop in the cycle is considered, and its effect on the overall performance is investigated. No specific heat source is considered, thus any heat source capable of providing temperature in the range from 500 °C to 850 °C can be utilized, such as solar energy, gas turbine exhaust, nuclear waste heat, etc. The commercial software ‘Aspen HYSYS version 9’ (Aspen Technology, Inc., Bedford, MA, USA) is used for simulations. Comparisons with the literature and simulation results are discussed first for the standalone S-CO2 BC. Energy analysis is done for the combined cycle to inspect the parameters affecting the cycle performance. The second law efficiency is calculated, and exergy losses incurred in different components of the cycle are discussed. View Full-Text
Keywords: supercritical carbon dioxide; recompression cycle; combined cycle; efficiency; organic Rankine cycle; exergy loss; second law efficiency supercritical carbon dioxide; recompression cycle; combined cycle; efficiency; organic Rankine cycle; exergy loss; second law efficiency
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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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Siddiqui, M.E.; Taimoor, A.A.; Almitani, K.H. Energy and Exergy Analysis of the S-CO2 Brayton Cycle Coupled with Bottoming Cycles. Processes 2018, 6, 153.

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