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On the dynamic modeling of Brayton cycle power conversion systems with the CATHARE-3 code

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  • Mauger, Gedeon
  • Tauveron, Nicolas
  • Bentivoglio, Fabrice
  • Ruby, Alain

Abstract

As the share of intermittent energy sources is increasing, the dynamic modeling of thermal power plants including their power conversion system gets researchers' attention. Recent applications require transient simulations of high-pressure nitrogen closed Brayton cycle for which the ideal gas assumption is no longer verified. In this work, the REFPROP real gas equation of state and pressure drop correlations suitable for high Reynolds numbers have been implemented in the CATHARE-3 code. Moreover, new real gas turbomachinery and sonic flow models have been developed and integrated in the code. Relative errors obtained for the nominal state of a high-pressure nitrogen closed Brayton cycle are in the range −3%/+0.8%. A detailed analysis of real gas effects is carried out on the heat exchangers heat flux and the piping pressure losses. The new sonic flow computed during a loss of coolant accident is in the best possible agreement with literature experimental results. With regard to the turbomachinery, the new real gas model creates a pressure dependence that brings compressors closer to the choke region when the pressure drops in the cycle. This work is expected to provide an efficient and reliable simulation tool for transient analysis of real gas closed Brayton cycles.

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  • Mauger, Gedeon & Tauveron, Nicolas & Bentivoglio, Fabrice & Ruby, Alain, 2019. "On the dynamic modeling of Brayton cycle power conversion systems with the CATHARE-3 code," Energy, Elsevier, vol. 168(C), pages 1002-1016.
    • Handle: RePEc:eee:energy:v:168:y:2019:i:c:p:1002-1016
    DOI: 10.1016/j.energy.2018.11.063
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    3. Hofer, Markus & Ren, Haikun & Hecker, Frieder & Buck, Michael & Brillert, Dieter & Starflinger, Jörg, 2022. "Simulation, analysis and control of a self-propelling heat removal system using supercritical CO2 under varying boundary conditions," Energy, Elsevier, vol. 247(C).
    4. Xu, Chi & Kong, Fanli & Yu, Dali & Yu, Jie & Khan, Muhammad Salman, 2021. "Influence of non-ideal gas characteristics on working fluid properties and thermal cycle of space nuclear power generation system," Energy, Elsevier, vol. 222(C).
    5. Zhang, Lianjie & Deng, Tianrui & Klemeš, Jiří Jaromír & Zeng, Min & Ma, Ting & Wang, Qiuwang, 2021. "Supercritical CO2 Brayton cycle at different heat source temperatures and its analysis under leakage and disturbance conditions," Energy, Elsevier, vol. 237(C).

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