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On-design pre-optimization and off-design analysis of hybrid Brayton thermosolar tower power plants for different fluids and plant configurations

Author

Listed:
  • Merchán, R.P.
  • Santos, M.J.
  • Heras, I.
  • Gonzalez-Ayala, J.
  • Medina, A.
  • Hernández, A. Calvo

Abstract

A working fluid performs a Brayton cycle that is fed by a heat input from a solar power tower and from a combustion chamber, which burns natural gas. This hybrid system is described by a complete model that includes all the main losses and irreversibility sources (optical and thermodynamic). Numerical implementation and validation is performed based on a Spanish commercial plant. On-design computations are carried out varying the pressure ratio for four working fluids (dry air, nitrogen, carbon dioxide, and helium), for different number of stages and for recuperative and non-recuperative configurations. When adjusting the pressure ratio, an improvement of about 7% in overall thermal efficiency is predicted for a dry air single-stage recuperative configuration with respect to a standard commercial gas turbine. A study about the main energy losses in each plant subsystem for some particular plant layouts is accomplished. A two-compression and expansion stages recuperative Brayton cycle working with air is expected to give overall thermal efficiencies about 0.29 at design conditions, which is about a 47% increase with respect to the simplest single-stage configuration. It is stressing that fuel consumption from the reheaters maybe higher than that of the main combustion chamber for multi-stage layouts. Off-design hourly curves of output records for the four seasons throughout a day are analyzed. Greenhouse emissions are also analyzed. Specific carbon dioxide emissions are smaller for helium than for dry air, when they both work in a single-stage non-recuperative configuration.

Suggested Citation

  • Merchán, R.P. & Santos, M.J. & Heras, I. & Gonzalez-Ayala, J. & Medina, A. & Hernández, A. Calvo, 2020. "On-design pre-optimization and off-design analysis of hybrid Brayton thermosolar tower power plants for different fluids and plant configurations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    • Handle: RePEc:eee:rensus:v:119:y:2020:i:c:s1364032119307981
    DOI: 10.1016/j.rser.2019.109590
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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. 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).
    3. Judit García-Ferrero & Irene Heras & María Jesús Santos & Rosa Pilar Merchán & Alejandro Medina & Antonio González & Antonio Calvo Hernández, 2020. "Thermodynamic and Cost Analysis of a Solar Dish Power Plant in Spain Hybridized with a Micro-Gas Turbine," Energies, MDPI, vol. 13(19), pages 1-24, October.

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