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Thermodynamic, Exergy and Environmental Impact Assessment of S-CO 2 Brayton Cycle Coupled with ORC as Bottoming Cycle

Author

Listed:
  • Edwin Espinel Blanco

    (Facultad de Ingeniería, Universidad Francisco de Paula Santander, Vía Acolsure. Sede el Algodonal Ocaña, Ocaña-Norte de Santander 546552, Colombia)

  • Guillermo Valencia Ochoa

    (Programa de Ingeniería Mecánica, Universidad del Atlántico, Carrera 30 Número 8–49, Puerto Colombia, Barranquilla 080007, Colombia)

  • Jorge Duarte Forero

    (Programa de Ingeniería Mecánica, Universidad del Atlántico, Carrera 30 Número 8–49, Puerto Colombia, Barranquilla 080007, Colombia)

Abstract

In this article, a thermodynamic, exergy, and environmental impact assessment was carried out on a Brayton S-CO 2 cycle coupled with an organic Rankine cycle (ORC) as a bottoming cycle to evaluate performance parameters and potential environmental impacts of the combined system. The performance variables studied were the net power, thermal and exergetic efficiency, and the brake-specific fuel consumption (BSFC) as a function of the variation in turbine inlet temperature (TIT) and high pressure (P HIGH ), which are relevant operation parameters from the Brayton S-CO 2 cycle. The results showed that the main turbine (T1) and secondary turbine (T2) of the Brayton S-CO 2 cycle presented higher exergetic efficiencies (97%), and a better thermal and exergetic behavior compared to the other components of the System. Concerning exergy destruction, it was found that the heat exchangers of the system presented the highest exergy destruction as a consequence of the large mean temperature difference between the carbon dioxide, thermal oil, and organic fluid, and thus this equipment presents the greatest heat transfer irreversibilities of the system. Also, through the Life Cycle Analysis, the potential environmental impact of the system was evaluated to propose a thermal design according to the sustainable development goals. Therefore, it was obtained that T1 was the component with a more significant environmental impact, with a maximum value of 4416 Pts when copper is selected as the equipment material.

Suggested Citation

  • Edwin Espinel Blanco & Guillermo Valencia Ochoa & Jorge Duarte Forero, 2020. "Thermodynamic, Exergy and Environmental Impact Assessment of S-CO 2 Brayton Cycle Coupled with ORC as Bottoming Cycle," Energies, MDPI, vol. 13(9), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:9:p:2259-:d:353854
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    References listed on IDEAS

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    Cited by:

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    2. Andrea De Pascale, 2021. "Organic Rankine Cycle for Energy Recovery System," Energies, MDPI, vol. 14(17), pages 1-3, August.
    3. Bo Shen & Moonis R. Ally, 2020. "Energy and Exergy Analysis of Low-Global Warming Potential Refrigerants as Replacement for R410A in Two-Speed Heat Pumps for Cold Climates," Energies, MDPI, vol. 13(21), pages 1-18, October.
    4. Lukas Kerpen & Achim Schmidt & Bernd Sankol, 2021. "Differentiating the Physical Optimum from the Exergetic Evaluation of a Methane Combustion Process," Energies, MDPI, vol. 14(12), pages 1-17, June.

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