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A Geothermal-Solar Hybrid Power Plant with Thermal Energy Storage

Author

Listed:
  • Brady Bokelman

    (Department of Engineering, TCU, Fort Worth, TX 76132, USA)

  • Efstathios E. Michaelides

    (Department of Engineering, TCU, Fort Worth, TX 76132, USA)

  • Dimitrios N. Michaelides

    (Department of Engineering Physics, University of Wisconsin, Madison, 53706 WI, USA)

Abstract

The concept of a geothermal-solar power plant is proposed that provides dispatchable power to the local electricity grid. The power plant generates significantly more power in the late afternoon and early evening hours of the summer, when air-conditioning use is high and peak power is demanded. The unit operates in two modes: a) as a binary geothermal power plant utilizing a subcritical Organic Rankine Cycle; and b) as a hybrid geothermal-solar power plant utilizing a supercritical cycle with solar-supplied superheat. Thermal storage allows for continuous power generation in the early evening hours. The switch to the second mode and the addition of solar energy into the cycle increases the electric power generated by a large factor—2 to 9 times—during peak power demand at a higher efficiency (16.8%). The constant supply of geothermal brine and heat storage in molten salts enables this power plant to produce dispatchable power in its two modes of operation with an exergetic efficiency higher than 30%.

Suggested Citation

  • Brady Bokelman & Efstathios E. Michaelides & Dimitrios N. Michaelides, 2020. "A Geothermal-Solar Hybrid Power Plant with Thermal Energy Storage," Energies, MDPI, vol. 13(5), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1018-:d:324734
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    References listed on IDEAS

    as
    1. Edrisi, Baktosh H. & Michaelides, Efstathios E., 2013. "Effect of the working fluid on the optimum work of binary-flashing geothermal power plants," Energy, Elsevier, vol. 50(C), pages 389-394.
    2. Manfrida, Giampaolo & Secchi, Riccardo & Stańczyk, Kamil, 2016. "Modelling and simulation of phase change material latent heat storages applied to a solar-powered Organic Rankine Cycle," Applied Energy, Elsevier, vol. 179(C), pages 378-388.
    3. Lorenzo Bruscoli & Daniele Fiaschi & Giampaolo Manfrida & Duccio Tempesti, 2015. "Improving the Environmental Sustainability of Flash Geothermal Power Plants—A Case Study," Sustainability, MDPI, vol. 7(11), pages 1-22, November.
    4. Ayub, Mohammad & Mitsos, Alexander & Ghasemi, Hadi, 2015. "Thermo-economic analysis of a hybrid solar-binary geothermal power plant," Energy, Elsevier, vol. 87(C), pages 326-335.
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    Cited by:

    1. Aram Mohammed Ahmed & László Kondor & Attila R. Imre, 2021. "Thermodynamic Efficiency Maximum of Simple Organic Rankine Cycles," Energies, MDPI, vol. 14(2), pages 1-17, January.
    2. Andrea Arbula Blecich & Paolo Blecich, 2023. "Thermoeconomic Analysis of Subcritical and Supercritical Isobutane Cycles for Geothermal Power Generation," Sustainability, MDPI, vol. 15(11), pages 1-25, May.

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    Keywords

    geothermal; solar; hybrid; ORC; duck curve;
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