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Thermodynamic model of a hybrid Brayton thermosolar plant

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  • Merchán, R.P.
  • Santos, M.J.
  • Medina, A.
  • Calvo Hernández, A.

Abstract

We present a thermodynamic model for the prediction of the performance records of a solar hybrid gas turbine power plant. Variable irradiance and ambient temperature conditions are considered. A serial hybridization is modeled with the aim to get an approximately constant turbine inlet temperature, and thus to deliver to the grid a stable power output. The overall thermal efficiency depends on the efficiencies of the involved subsystems and the required heat exchangers in a straightforward analytical way. Numerical values for input parameters are taken from a central tower heliostat field recently developed near Seville, Spain. Real data for irradiance and external temperature are taken in hourly terms. Curves for the evolution of plant efficiencies (solar, gas turbine, fuel conversion efficiency, overall efficiency, etc.) and solar share are presented for representative days of each season. The cases of non-recuperative and recuperative plant configurations are shown. Estimations of the hourly evolution of fuel consumption are simulated as well as savings between the hybrid solar operation model and the pure combustion mode. During summer, fuel saving can reach about 11.5% for a recuperative plant layout. In addition, plant emissions for several configurations are presented.

Suggested Citation

  • Merchán, R.P. & Santos, M.J. & Medina, A. & Calvo Hernández, A., 2018. "Thermodynamic model of a hybrid Brayton thermosolar plant," Renewable Energy, Elsevier, vol. 128(PB), pages 473-483.
    • Handle: RePEc:eee:renene:v:128:y:2018:i:pb:p:473-483
    DOI: 10.1016/j.renene.2017.05.081
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    References listed on IDEAS

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    1. Collado, Francisco J. & Guallar, Jesús, 2013. "A review of optimized design layouts for solar power tower plants with campo code," Renewable and Sustainable Energy Reviews, Elsevier, vol. 20(C), pages 142-154.
    2. Okoroigwe, Edmund & Madhlopa, Amos, 2016. "An integrated combined cycle system driven by a solar tower: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 337-350.
    3. Dunham, Marc T. & Iverson, Brian D., 2014. "High-efficiency thermodynamic power cycles for concentrated solar power systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 758-770.
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    Cited by:

    1. Peng, Wanli & Gonzalez-Ayala, Julian & Su, Guozhen & Chen, Jincan & Hernández, Antonio Calvo, 2021. "Solar-driven sodium thermal electrochemical converter coupled to a Brayton heat engine: Parametric optimization," Renewable Energy, Elsevier, vol. 164(C), pages 260-271.
    2. Mahdavi, Navid & Khalilarya, Shahram, 2019. "Comprehensive thermodynamic investigation of three cogeneration systems including GT-HRSG/RORC as the base system, intermediate system and solar hybridized system," Energy, Elsevier, vol. 181(C), pages 1252-1272.
    3. Rovense, Francesco & Sebastián, Andrés & Abbas, Rubén & Romero, Manuel & González-Aguilar, José, 2023. "Performance map analysis of a solar-driven and fully unfired closed-cycle micro gas turbine," Energy, Elsevier, vol. 263(PB).
    4. Merchán, R.P. & Santos, M.J. & Medina, A. & Calvo Hernández, A., 2022. "High temperature central tower plants for concentrated solar power: 2021 overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 155(C).
    5. Iora, Paolo & Beretta, Gian Paolo & Ghoniem, Ahmed F., 2019. "Exergy loss based allocation method for hybrid renewable-fossil power plants applied to an integrated solar combined cycle," Energy, Elsevier, vol. 173(C), pages 893-901.
    6. Chen, Jinli & Xiao, Gang & Ferrari, Mario Luigi & Yang, Tianfeng & Ni, Mingjiang & Cen, Kefa, 2020. "Dynamic simulation of a solar-hybrid microturbine system with experimental validation of main parts," Renewable Energy, Elsevier, vol. 154(C), pages 187-200.

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