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Transient Simulation of Geothermal Combined Heat and Power Generation for a Resilient Energetic and Economic Evaluation

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  • Tim Eller

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, Germany)

  • Florian Heberle

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, Germany)

  • Dieter Brüggemann

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, 95440 Bayreuth, Germany)

Abstract

Geothermal power plants based on the organic Rankine cycle (ORC) are used to convert the thermal power of brine into electricity. The efficiency and profitability of these power plants can be increased by an additional heat supply. The purpose of this study is to evaluate different combined heat and power (CHP) concepts for geothermal applications by thermodynamic and economic considerations. Therefore, a dynamic simulation model of a double-stage ORC is developed to perform annual return simulations. The transient ORC model is validated in a wide range by operational data of an existing power plant in the German Molasse Basin. A district heating system is considered and the corresponding heat load profiles are derived from a real geothermal driven heating network. For CHP, parallel and combined configurations are considered. The validation of the transient model is satisfying with a correlation coefficient of 0.99 between the simulation and real power plant data. The results show that additional heat extraction leads to a higher exergetic efficiency and a higher profitability. The exergetic efficiency and the profitability are increased by up to 7.9% and 16.1%, respectively. The combined concept shows a slightly better performance than the parallel configuration. The efficiency can be increased by up to 1.3%. In economic terms, for CHP the annual return can be increased by at least 2,500,000 €. In principle, the dynamic model shows reliable results for high power gradients. This enables an investigation of geothermal ORC models for the reserve market in future works.

Suggested Citation

  • Tim Eller & Florian Heberle & Dieter Brüggemann, 2019. "Transient Simulation of Geothermal Combined Heat and Power Generation for a Resilient Energetic and Economic Evaluation," Energies, MDPI, vol. 12(5), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:894-:d:212033
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    References listed on IDEAS

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    1. Wieland, Christoph & Meinel, Dominik & Eyerer, Sebastian & Spliethoff, Hartmut, 2016. "Innovative CHP concept for ORC and its benefit compared to conventional concepts," Applied Energy, Elsevier, vol. 183(C), pages 478-490.
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    1. Vaupel, Yannic & Huster, Wolfgang R. & Mhamdi, Adel & Mitsos, Alexander, 2021. "Optimal operating policies for organic Rankine cycles for waste heat recovery under transient conditions," Energy, Elsevier, vol. 224(C).
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    3. Menberg, Kathrin & Heberle, Florian & Bott, Christoph & Brüggemann, Dieter & Bayer, Peter, 2021. "Environmental performance of a geothermal power plant using a hydrothermal resource in the Southern German Molasse Basin," Renewable Energy, Elsevier, vol. 167(C), pages 20-31.
    4. Pili, R. & Eyerer, S. & Dawo, F. & Wieland, C. & Spliethoff, H., 2020. "Development of a non-linear state estimator for advanced control of an ORC test rig for geothermal application," Renewable Energy, Elsevier, vol. 161(C), pages 676-690.
    5. Menberg, Kathrin & Heberle, Florian & Uhrmann, Hannah & Bott, Christoph & Grünäugl, Sebastian & Brüggemann, Dieter & Bayer, Peter, 2023. "Environmental impact of cogeneration in binary geothermal plants," Renewable Energy, Elsevier, vol. 218(C).
    6. Davide Toselli & Florian Heberle & Dieter Brüggemann, 2019. "Techno-Economic Analysis of Hybrid Binary Cycles with Geothermal Energy and Biogas Waste Heat Recovery," Energies, MDPI, vol. 12(10), pages 1-18, May.
    7. Schifflechner, Christopher & Dawo, Fabian & Eyerer, Sebastian & Wieland, Christoph & Spliethoff, Hartmut, 2020. "Thermodynamic comparison of direct supercritical CO2 and indirect brine-ORC concepts for geothermal combined heat and power generation," Renewable Energy, Elsevier, vol. 161(C), pages 1292-1302.

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