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Assessing the Hybridization of an Existing Geothermal Plant by Coupling a CSP System for Increasing Power Generation

Author

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  • Yanara Tranamil-Maripe

    (Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago 8370456, Chile
    Current address: Departamento de Energías Sostenibles, Ministerio de Energía, Santiago 8340518, Chile.)

  • José M. Cardemil

    (Departamento de Ingeniería Mecánica y Metalúrgica, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile)

  • Rodrigo Escobar

    (Departamento de Ingeniería Mecánica y Metalúrgica, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
    Centro del Desierto de Atacama, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile)

  • Diego Morata

    (Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago 8370456, Chile
    Centro de Excelencia en Geotermia de los Andes (CEGA), Santiago 8370456, Chile)

  • Cristóbal Sarmiento-Laurel

    (School of Industrial Engineering, Universidad Diego Portales, Santiago 8370191, Chile)

Abstract

Concentrated Solar Power (CSP) and geothermal energy systems are outlined as two of the most promising technologies for sustainable and reliable electricity generation. Several studies in the technical literature have pointed out that the hybridization of solar and geothermal energy sources could lead to a reduction of the levelized cost of energy (LCOE) of geothermal systems, as well as improving the capacity factor of CSP systems. However, the technical literature shows that the integration of solar thermal collectors does not present a positive impact in all scenarios analyzed. The present study aims to further analyze the competitiveness of the hybridization of solar and geothermal systems under high irradiation conditions such as those observed in the Andean region in northern Chile. The evaluation was carried out by coupling a thermodynamic model in Engineering Equation Solver (EES) with a solar thermal model in the System Advisor Model (SAM). The assessment considers the configuration of an existing geothermal plant, considering the design constraints associated with the actual operating conditions of the plant. The analysis is based on an energy and exergy assessment, allowing us to identify the efficiency of the subsystems introduced for the hybridization and assess the competitiveness of the hybrid schemes by an economic assessment in terms of the LCOE. The results show that the hybrid schemes allow a reduction of the LCOE of a geothermal stand-alone plant by about 10 USD / MWh , increasing the competitiveness of the geothermal system. However, a large variation on such a reduction is observed depending on the size of the solar field and the storage tank of the solar system.

Suggested Citation

  • Yanara Tranamil-Maripe & José M. Cardemil & Rodrigo Escobar & Diego Morata & Cristóbal Sarmiento-Laurel, 2022. "Assessing the Hybridization of an Existing Geothermal Plant by Coupling a CSP System for Increasing Power Generation," Energies, MDPI, vol. 15(6), pages 1-28, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:6:p:1961-:d:766292
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    References listed on IDEAS

    as
    1. Li, Kewen & Bian, Huiyuan & Liu, Changwei & Zhang, Danfeng & Yang, Yanan, 2015. "Comparison of geothermal with solar and wind power generation systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 1464-1474.
    2. 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.
    3. Monia Procesi, 2014. "Geothermal Potential Evaluation for Northern Chile and Suggestions for New Energy Plans," Energies, MDPI, vol. 7(8), pages 1-16, August.
    4. Ciani Bassetti, Martina & Consoli, Daniele & Manente, Giovanni & Lazzaretto, Andrea, 2018. "Design and off-design models of a hybrid geothermal-solar power plant enhanced by a thermal storage," Renewable Energy, Elsevier, vol. 128(PB), pages 460-472.
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