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A multivariable optimization of a Brayton power cycle operating with CO2 as working fluid

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  • Battisti, Felipe G.
  • Cardemil, José M.
  • da Silva, Alexandre K.

Abstract

This article simulates and optimizes a CO2-based Brayton cycle having one re-heating stage and one recuperator such that the exergetic efficiency, normalized by the cycle's overall global conductance, ηII/(UA)Total, is maximized. In total, six operational parameters are simultaneously optimized for the cycle, which are: the heat source temperature, the CO2's highest temperature, the CO2's highest and lowest pressure values, and the heat source's mass flow rates directed to the heater and re-heater. For that, a dedicated thermodynamic routine was implemented and coupled to a property database, which was able to account for the large variation of thermophysical properties near the critical point, along with a hybrid optimization routine. The optimization process showed that the normalized exergetic efficiency was highly affected by all parameters considered, and that a pronounced global maximum is obtainable with respect to all optimization variables, except the heat source temperature. The trends obtained not only confirm the importance of the optimization process proposed, but also permitted the development of a direct relation between the normalized exergetic efficiency and the heat source temperature. Additionally, the results suggest the existence of an optimal total global conductance for the cycle, which serves as a scale for the power plant.

Suggested Citation

  • Battisti, Felipe G. & Cardemil, José M. & da Silva, Alexandre K., 2016. "A multivariable optimization of a Brayton power cycle operating with CO2 as working fluid," Energy, Elsevier, vol. 112(C), pages 908-916.
    • Handle: RePEc:eee:energy:v:112:y:2016:i:c:p:908-916
    DOI: 10.1016/j.energy.2016.06.118
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    References listed on IDEAS

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    Cited by:

    1. Sánchez, Carlos J.N. & da Silva, Alexandre K., 2018. "Technical and environmental analysis of transcritical Rankine cycles operating with numerous CO2 mixtures," Energy, Elsevier, vol. 142(C), pages 180-190.
    2. Ehsan, M. Monjurul & Duniam, Sam & Li, Jishun & Guan, Zhiqiang & Gurgenci, Hal & Klimenko, Alexander, 2019. "Effect of cooling system design on the performance of the recompression CO2 cycle for concentrated solar power application," Energy, Elsevier, vol. 180(C), pages 480-494.
    3. Zhao, Bingtao & Yao, Jiacheng & Su, Yaxin, 2023. "Performance response to operating-load fluctuations for Sub-megawatt-scale recuperated supercritical CO2 Brayton cycles: Characteristics and improvement," Renewable Energy, Elsevier, vol. 206(C), pages 686-693.
    4. Wang, Lin & Pan, Liang-ming & Wang, Junfeng & Chen, Deqi & Huang, Yanping & Hu, Lian, 2019. "Investigation on the temperature sensitivity of the S-CO2 Brayton cycle efficiency," Energy, Elsevier, vol. 178(C), pages 739-750.
    5. Battisti, Felipe G. & Delsoto, Giovanni S. & da Silva, Alexandre K., 2018. "Transient analysis and optimization of a recuperative sCO2 Brayton cycle assisted by heat and mass storage systems," Energy, Elsevier, vol. 150(C), pages 979-991.

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