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Combined Power and Freshwater Generation Driven by Liquid-Dominated Geothermal Sources

Author

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  • Guopeng Yu

    (School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK)

  • Zhibin Yu

    (School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK)

Abstract

In order to meet the twin challenges of energy shortage and water scarcity in eastern Africa, this paper looks at the feasibilities of using a geothermal water source to produce both fresh water and electricity. In this research, three geothermally sourced combined power and freshwater generation systems are investigated and compared. Two of them are based on traditional power generation systems, including a steam system (SS) and a single-flash system (SFS). The third one is a trilateral flash system (TFS) with a two-phase turbine, which processes the total geofluid flow from the wellhead directly. The power generation potential as well as the condensation process, which produces desalinized freshwater, are investigated for three systems under two typical liquid-dominated well conditions in the Aluto Langano geothermal field in Ethiopia. Results indicate that, suitable total flow turbine efficiency enables the trilateral flash system to be comparable with the steam system and the single-flash system regarding the power generation, especially when the well flow is more liquid dominated. Moreover, freshwater generation is a distinct advantage of the trilateral flash system, and its freshwater output can reach up to be 2.7 times higher than those of traditional systems, making it a promising solution for combined power and freshwater generation.

Suggested Citation

  • Guopeng Yu & Zhibin Yu, 2019. "Combined Power and Freshwater Generation Driven by Liquid-Dominated Geothermal Sources," Energies, MDPI, vol. 12(8), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1562-:d:225685
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    References listed on IDEAS

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    1. Calise, Francesco & Macaluso, Adriano & Piacentino, Antonio & Vanoli, Laura, 2017. "A novel hybrid polygeneration system supplying energy and desalinated water by renewable sources in Pantelleria Island," Energy, Elsevier, vol. 137(C), pages 1086-1106.
    2. Calise, Francesco & Dentice d'Accadia, Massimo & Macaluso, Adriano & Vanoli, Laura & Piacentino, Antonio, 2016. "A novel solar-geothermal trigeneration system integrating water desalination: Design, dynamic simulation and economic assessment," Energy, Elsevier, vol. 115(P3), pages 1533-1547.
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