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Comparison of series/parallel configuration for a low-T geothermal CHP plant, coupled to thermal networks

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  • Van Erdeweghe, Sarah
  • Van Bael, Johan
  • Laenen, Ben
  • D'haeseleer, William

Abstract

In this paper, the performance of a low-temperature (130 °C) geothermally-fed combined heat-and-power (CHP) plant coupled to third and fourth generation thermal networks is investigated. The series and parallel CHP configurations are compared based on an exergy analysis. Whether the series or the parallel CHP has the best performance depends on the thermal network requirements. The results are discussed for a wide range of supply (40–110 °C) and return (30–70 °C) temperatures and for three values of the heat demand. The heat-to-electricity conversion is done via an Organic Rankine Cycle (ORC). In general, the parallel configuration is the most appropriate for the connection to high-temperature thermal networks and the series configuration performs better for the connection to low-temperature thermal networks. For a nominal heat demand of 6 MW, the parallel configuration connected to a 80/60 thermal network has an exergetic plant efficiency of 41.25% which is 1.67%-pts higher than for a pure electrical power plant. The corresponding electrical power output is 89% of the pure electrical power plant. The series configuration connected to a 50/30 thermal network has an exergetic efficiency of 42.63%, which is 3.05%-pts higher than for a pure electrical power plant and produces the same electrical power output. An additional important finding is that for isentropic and dry ORC fluids, the use of superheating might increase the electrical power output if the ORC outlet temperature is constrained to a relatively high value. For the investigated brine conditions and R236ea as a working fluid, the use of superheating improves the electrical power output already for ORC outlet temperatures higher than 80 °C in case of a recuperated ORC. For the basic cycle, this is only for ORC outlet temperatures higher than 109 °C.

Suggested Citation

  • Van Erdeweghe, Sarah & Van Bael, Johan & Laenen, Ben & D'haeseleer, William, 2017. "Comparison of series/parallel configuration for a low-T geothermal CHP plant, coupled to thermal networks," Renewable Energy, Elsevier, vol. 111(C), pages 494-505.
    • Handle: RePEc:eee:renene:v:111:y:2017:i:c:p:494-505
    DOI: 10.1016/j.renene.2017.04.031
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    Citations

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    Cited by:

    1. 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.
    2. Eyerer, Sebastian & Dawo, Fabian & Schifflechner, Christopher & Niederdränk, Anne & Spliethoff, Hartmut & Wieland, Christoph, 2022. "Experimental evaluation of an ORC-CHP architecture based on regenerative preheating for geothermal applications," Applied Energy, Elsevier, vol. 315(C).
    3. Ebadollahi, Mohammad & Amidpour, Majid & Pourali, Omid & Ghaebi, Hadi, 2022. "Development of a novel flexible multigeneration energy system for meeting the energy needs of remote areas," Renewable Energy, Elsevier, vol. 198(C), pages 1224-1242.
    4. Schifflechner, Christopher & Kuhnert, Lara & Irrgang, Ludwig & Dawo, Fabian & Kaufmann, Florian & Wieland, Christoph & Spliethoff, Hartmut, 2023. "Geothermal trigeneration systems with Organic Rankine Cycles: Evaluation of different plant configurations considering part load behaviour," Renewable Energy, Elsevier, vol. 207(C), pages 218-233.
    5. 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.
    6. Lee, Inkyu & Tester, Jefferson William & You, Fengqi, 2019. "Systems analysis, design, and optimization of geothermal energy systems for power production and polygeneration: State-of-the-art and future challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 551-577.
    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.
    8. Van Erdeweghe, Sarah & Van Bael, Johan & Laenen, Ben & D'haeseleer, William, 2018. "Optimal combined heat-and-power plant for a low-temperature geothermal source," Energy, Elsevier, vol. 150(C), pages 396-409.
    9. Chen, Heng & Wang, Yihan & Li, Jiarui & Xu, Gang & Lei, Jing & Liu, Tong, 2022. "Thermodynamic analysis and economic assessment of an improved geothermal power system integrated with a biomass-fired cogeneration plant," Energy, Elsevier, vol. 240(C).
    10. Van Erdeweghe, Sarah & Van Bael, Johan & Laenen, Ben & D’haeseleer, William, 2019. "Design and off-design optimization procedure for low-temperature geothermal organic Rankine cycles," Applied Energy, Elsevier, vol. 242(C), pages 716-731.
    11. Hoang, Anh Tuan, 2018. "Waste heat recovery from diesel engines based on Organic Rankine Cycle," Applied Energy, Elsevier, vol. 231(C), pages 138-166.
    12. Eyerer, Sebastian & Dawo, Fabian & Wieland, Christoph & Spliethoff, Hartmut, 2020. "Advanced ORC architecture for geothermal combined heat and power generation," Energy, Elsevier, vol. 205(C).
    13. Hu, Shuozhuo & Yang, Zhen & Li, Jian & Duan, Yuanyuan, 2022. "Optimal solar thermal retrofit for geothermal power systems considering the lifetime brine degradation," Renewable Energy, Elsevier, vol. 186(C), pages 628-645.
    14. Van Erdeweghe, Sarah & Van Bael, Johan & Laenen, Ben & D'haeseleer, William, 2019. "Optimal configuration for a low-temperature geothermal CHP plant based on thermoeconomic optimization," Energy, Elsevier, vol. 179(C), pages 323-335.

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