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Analysis and Evaluation of a TCO 2 Electrothermal Energy Storage System with Integration of CO 2 Geological Storage

Author

Listed:
  • Aristeidis Stoikos

    (Department of Mechanical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
    Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 57001 Thessaloniki, Greece)

  • Alexios-Spyridon Kyriakides

    (Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 57001 Thessaloniki, Greece)

  • Júlio Carneiro

    (ICT/IIFA, Geosciences Department, Universidade de Évora, R. Romão Ramalho 59, 7000-671 Évora, Portugal
    Converge! Lda, Parque de Ciência e Tecnologia do Alentejo, R. Luís Adelino da Fonseca, Lt 1A, 7005-841 Évora, Portugal)

  • Dounya Behnous

    (Converge! Lda, Parque de Ciência e Tecnologia do Alentejo, R. Luís Adelino da Fonseca, Lt 1A, 7005-841 Évora, Portugal)

  • Georgios Gravanis

    (Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 57001 Thessaloniki, Greece
    Department of Information and Electronic Engineering, International Hellenic University, 57001 Thessaloniki, Greece)

  • Ioannis N. Tsimpanogiannis

    (Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 57001 Thessaloniki, Greece)

  • Panos Seferlis

    (Department of Mechanical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece)

  • Spyros Voutetakis

    (Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, 57001 Thessaloniki, Greece)

Abstract

The goal to reduce greenhouse gas emissions necessitates the increase in RES utilization. To accomplish this goal, energy storage solutions are required. This study investigates the performance of an electrothermal energy storage system, the CEEGS, which consists of an above-surface energy storage system and a below-surface geological system. The focus is set initially on the analysis of the above-surface system to gain insight into its operation. Then, steady-state optimization is utilized to identify the operating conditions that maximize the system performance, before investigating the below-surface system integration and the effect that the geological conditions have on system performance. For the above-surface system, efficiency (η R-T ) up to 46.89% is calculated. For systems integrated with CO 2 geological storage, two case studies are examined, presenting higher η R-T compared to the above-surface system (Case study 1: 50.37%, Case study 2: 67.39%). The optimal η R-T for Case study 2 is achieved for higher injection/production pressures and temperatures conditions and minimal ΔP and ΔT between injection and production. In conclusion, it is the selection of the geological storage conditions that contribute the most to the optimal η R-T ; thus, the selection of the appropriate geological storage formation is imperative.

Suggested Citation

  • Aristeidis Stoikos & Alexios-Spyridon Kyriakides & Júlio Carneiro & Dounya Behnous & Georgios Gravanis & Ioannis N. Tsimpanogiannis & Panos Seferlis & Spyros Voutetakis, 2025. "Analysis and Evaluation of a TCO 2 Electrothermal Energy Storage System with Integration of CO 2 Geological Storage," Energies, MDPI, vol. 18(3), pages 1-29, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:3:p:601-:d:1578506
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