A comparative study of the energy, exergetic and thermo-economic performance of a novelty combined Brayton S-CO2-ORC configurations as bottoming cycles

This paper presents a comparative study on the energy, exergetic and thermo-economic performance of a novelty thermal power system integrated by a supercritical CO2 Brayton cycle, and a recuperative organic Rankine cycle (RORC) or a simple organic Rankine cycle (SORC). A thermodynamic model was deve...

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Bibliographic Details
Published in:Heliyon 2020-07, Vol.6 (7), p.e04459-e04459, Article e04459
Main Authors: Gutierrez, Javier Cardenas, Ochoa, Guillermo Valencia, Duarte-Forero, Jorge
Format: Article
Language:English
Subjects:
Energy
Energy analysis
Energy conservation
Exergetic analysis
Gas turbine
Mechanical engineering
Organic Rankine cycle
PSO optimization
Supercritical CO2 Brayton cycle
Thermo-economic indicators
Thermodynamics
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Summary:This paper presents a comparative study on the energy, exergetic and thermo-economic performance of a novelty thermal power system integrated by a supercritical CO2 Brayton cycle, and a recuperative organic Rankine cycle (RORC) or a simple organic Rankine cycle (SORC). A thermodynamic model was developed applying the mass, energy and exergy balances to all the equipment, allowing to calculate the exergy destruction in the components. In addition, a sensitivity analysis allowed studying the effect of the primary turbine inlet temperature (TIT, PHIGH, rP and TC) on the net power generated, the thermal and exergy efficiency, and some thermo-economic indicators such as the payback period (PBP), the specific investment cost (SIC), and the levelized cost of energy (LCOE), when cyclohexane, acetone and toluene are used as working fluids in the bottoming organic Rankine cycle. The parametric study results show that cyclohexane is the organic fluid that presents the best thermo-economic performance, and the optimization with the PSO method conclude a 2308.91 USD/kWh in the SIC, 0.22 USD/kWh in the LCOE, and 9.89 year in the PBP for the RORC system. Therefore, to obtain technical and economic viability, and increase the industrial applications of these thermal systems, thermo-economic optimizations must be proposed to obtain lower values of the evaluated performance indicators. Energy; Mechanical engineering; Thermodynamics; Energy conservation; Gas turbine; Organic Rankine cycle; Supercritical CO2 Brayton cycle; Exergetic analysis; Energy analysis; Thermo-economic indicators; PSO optimization.
ISSN:2405-8440
2405-8440
DOI:10.1016/j.heliyon.2020.e04459