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Exergy Analysis and Optimization of a Combined Heat and Power Geothermal Plant

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  • Fabien Marty

    (Laboratory of Thermal, Energy and Processes-IPRA, University of Pau and Pays de l’Adour (E2S UPPA), EA1932, ENSGTI, 64000 Pau, France)

  • Sylvain Serra

    (Laboratory of Thermal, Energy and Processes-IPRA, University of Pau and Pays de l’Adour (E2S UPPA), EA1932, ENSGTI, 64000 Pau, France)

  • Sabine Sochard

    (Laboratory of Thermal, Energy and Processes-IPRA, University of Pau and Pays de l’Adour (E2S UPPA), EA1932, ENSGTI, 64000 Pau, France)

  • Jean-Michel Reneaume

    (Laboratory of Thermal, Energy and Processes-IPRA, University of Pau and Pays de l’Adour (E2S UPPA), EA1932, ENSGTI, 64000 Pau, France)

Abstract

This paper presents the optimization of parallel distribution between electricity and heat production for a geothermal plant. The geothermal fluid is split into two streams, one used for an Organic Rankine Cycle (ORC) system, and the other for a District Heating Network (DHN). The superstructure to be used for the optimization problem includes the ORC components and the DHN topology constituted by a definite consumer and optional consumers. A Mixed Integer Non-Linear Programming (MINLP) optimization problem is formulated and solved using the GAMS software. This paper is focused on exergetic aspect. The main lines for formulation of the problem are reminded, yet the exergetic model is fully described. Exergy analysis is performed for two optimal solutions (economic and exergetic objective functions). Results for both optimizations are first compared. The analysis of exergetic efficiency of the ORC and the DHN may suggest that exergetic optimization privileges the system with the highest efficiency: the ORC. The DHN configuration is then the smallest as possible. Finally, a sensitive analysis is performed for the exergetic optimization. This analysis reveals our previous conclusion is not necessarily true. Taller configuration can exist even if ORC efficiency is higher than DHN efficiency. These results highlight the relevance of using an optimization approach for a Combined Heat and Power (CHP) plant.

Suggested Citation

  • Fabien Marty & Sylvain Serra & Sabine Sochard & Jean-Michel Reneaume, 2019. "Exergy Analysis and Optimization of a Combined Heat and Power Geothermal Plant," Energies, MDPI, vol. 12(6), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1175-:d:217343
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    References listed on IDEAS

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    Cited by:

    1. Tian Zhao & Di Liu & Ke-Lun He & Xi Chen & Qun Chen, 2020. "An Integrated Three-Level Synergetic and Reliable Optimization Method Considering Heat Transfer Process, Component, and System," Energies, MDPI, vol. 13(16), pages 1-19, August.
    2. Régis Delubac & Sylvain Serra & Sabine Sochard & Jean-Michel Reneaume, 2021. "A Dynamic Optimization Tool to Size and Operate Solar Thermal District Heating Networks Production Plants," Energies, MDPI, vol. 14(23), pages 1-27, November.

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