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Comparative Analysis of Power Plant Options for Enhanced Geothermal Systems (EGS)

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  • Mengying Li

    (Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104-6315, USA)

  • Noam Lior

    (Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104-6315, USA)

Abstract

Enhanced geothermal systems (EGS) extract heat from underground hot dry rock (HDR) by first fracturing the HDR and then circulating a geofluid (typically water) into it and bringing the heated geofluid to a power plant to generate electricity. This study focuses on analysis, examination, and comparison of leading geothermal power plant configurations with a geofluid temperature from 200 to 800 °C, and also analyzes the embodied energy of EGS surface power plants. The power generation analysis is focused on flash type cycles for using subcritical geofluid (<374 °C) and expansion type cycles for using supercritical geofluid (>374 °C). Key findings of this study include: (i) double-flash plants have 24.3%–29.0% higher geofluid effectiveness than single-flash ones, and 3%–10% lower specific embodied energy; (ii) the expansion type plants have geofluid effectiveness > 750 kJ/kg, significantly higher than flash type plants (geofluid effectiveness < 300 kJ/kg) and the specific embodied energy is lower; (iii) to increase the turbine outlet vapor fraction from 0.75 to 0.90, we include superheating by geofluid but that reduces the geofluid effectiveness by 28.3%; (iv) for geofluid temperatures above 650 °C, double-expansion plants have a 2% higher geofluid effectiveness and 5%–8% lower specific embodied energy than single-expansion ones.

Suggested Citation

  • Mengying Li & Noam Lior, 2014. "Comparative Analysis of Power Plant Options for Enhanced Geothermal Systems (EGS)," Energies, MDPI, vol. 7(12), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:12:p:8427-8445:d:43669
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    References listed on IDEAS

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    1. Yari, Mortaza, 2010. "Exergetic analysis of various types of geothermal power plants," Renewable Energy, Elsevier, vol. 35(1), pages 112-121.
    2. Yildirim, Deniz & Ozgener, Leyla, 2012. "Thermodynamics and exergoeconomic analysis of geothermal power plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(8), pages 6438-6454.
    3. Kanoglu, Mehmet & Bolatturk, Ali, 2008. "Performance and parametric investigation of a binary geothermal power plant by exergy," Renewable Energy, Elsevier, vol. 33(11), pages 2366-2374.
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    Citations

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    Cited by:

    1. Caulk, Robert A. & Tomac, Ingrid, 2017. "Reuse of abandoned oil and gas wells for geothermal energy production," Renewable Energy, Elsevier, vol. 112(C), pages 388-397.
    2. Yuchao Zeng & Liansheng Tang & Nengyou Wu & Jing Song & Yifei Cao, 2017. "Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field," Energies, MDPI, vol. 10(12), pages 1-17, December.
    3. Olasolo, P. & Juárez, M.C. & Morales, M.P. & D´Amico, Sebastiano & Liarte, I.A., 2016. "Enhanced geothermal systems (EGS): A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 133-144.
    4. Jiang, Peixue & Li, Xiaolu & Xu, Ruina & Zhang, Fuzhen, 2016. "Heat extraction of novel underground well pattern systems for geothermal energy exploitation," Renewable Energy, Elsevier, vol. 90(C), pages 83-94.
    5. Paweł Gładysz & Anna Sowiżdżał & Maciej Miecznik & Maciej Hacaga & Leszek Pająk, 2020. "Techno-Economic Assessment of a Combined Heat and Power Plant Integrated with Carbon Dioxide Removal Technology: A Case Study for Central Poland," Energies, MDPI, vol. 13(11), pages 1-34, June.
    6. Kaiyong Hu & Jialing Zhu & Wei Zhang & Xinli Lu, 2016. "A Selection Method for Power Generation Plants Used for Enhanced Geothermal Systems (EGS)," Energies, MDPI, vol. 9(8), pages 1-12, July.
    7. Moussa, Tamer & Dehghanpour, Hassan, 2022. "Evaluating geothermal energy production from suspended oil and gas wells by using data mining," Renewable Energy, Elsevier, vol. 196(C), pages 1294-1307.
    8. Li, Mengying & Lior, Noam, 2015. "Energy analysis for guiding the design of well systems of deep Enhanced Geothermal Systems," Energy, Elsevier, vol. 93(P1), pages 1173-1188.
    9. Lu, Xinli & Zhao, Yangyang & Zhu, Jialing & Zhang, Wei, 2018. "Optimization and applicability of compound power cycles for enhanced geothermal systems," Applied Energy, Elsevier, vol. 229(C), pages 128-141.

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