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A temperature threshold evaluation for thermocline energy storage in concentrated solar power plants

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  • Fasquelle, T.
  • Falcoz, Q.
  • Neveu, P.
  • Hoffmann, J.-F.

Abstract

Regarding energy storage in concentrated solar power plants, thermocline technology is considered to be a cost effective but less efficient solution than conventional two-tank. However, thermocline storage charge and discharge are usually stopped when the varying outlet temperature reaches an arbitrarily chosen value. It is shown here that the stop of the thermocline charge depends on the overheating risk in the solar collectors, while the stop of the discharge is defined by the steam generator requirements. As a consequence, the temperature thresholds that must be defined by the experimental constraints are dynamic. Using these dynamic thresholds on an experimental setup comprising a 230 kWh thermocline tank and a 150 kWth parabolic trough solar field led to a charge efficiency of 95.7% and a 93.5% discharge efficiency. Thus, the varying outlet temperature of a thermocline storage system is not an issue when integrated in a concentrated solar power plant.

Suggested Citation

  • Fasquelle, T. & Falcoz, Q. & Neveu, P. & Hoffmann, J.-F., 2018. "A temperature threshold evaluation for thermocline energy storage in concentrated solar power plants," Applied Energy, Elsevier, vol. 212(C), pages 1153-1164.
    • Handle: RePEc:eee:appene:v:212:y:2018:i:c:p:1153-1164
    DOI: 10.1016/j.apenergy.2017.12.105
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    6. Attonaty, Kevin & Stouffs, Pascal & Pouvreau, Jérôme & Oriol, Jean & Deydier, Alexandre, 2019. "Thermodynamic analysis of a 200 MWh electricity storage system based on high temperature thermal energy storage," Energy, Elsevier, vol. 172(C), pages 1132-1143.
    7. Xinming Xi & Zicheng Zhang & Huimin Wei & Zeyu Chen & Xiaoze Du, 2023. "Experimental Study of Simultaneous Charging and Discharging Process in Thermocline Phase Change Heat Storage System Based on Solar Energy," Sustainability, MDPI, vol. 15(9), pages 1-17, April.
    8. Toshiyuki Sueyoshi & Mika Goto, 2019. "Comparison among Three Groups of Solar Thermal Power Stations by Data Envelopment Analysis," Energies, MDPI, vol. 12(13), pages 1-20, June.
    9. Mostafavi Tehrani, S. Saeed & Shoraka, Yashar & Nithyanandam, Karthik & Taylor, Robert A., 2019. "Shell-and-tube or packed bed thermal energy storage systems integrated with a concentrated solar power: A techno-economic comparison of sensible and latent heat systems," Applied Energy, Elsevier, vol. 238(C), pages 887-910.
    10. Wanruo Lou & Lingai Luo & Yuchao Hua & Yilin Fan & Zhenyu Du, 2021. "A Review on the Performance Indicators and Influencing Factors for the Thermocline Thermal Energy Storage Systems," Energies, MDPI, vol. 14(24), pages 1-19, December.
    11. Lou, Wanruo & Xie, Baoshan & Aubril, Julien & Fan, Yilin & Luo, Lingai & Arrivé, Arnaud, 2023. "Optimized flow distributor for stabilized thermal stratification in a single-medium thermocline storage tank: A numerical and experimental study," Energy, Elsevier, vol. 263(PA).
    12. Elfeky, Karem Elsayed & Mohammed, Abubakar Gambo & Wang, Qiuwang, 2021. "Cycle cut-off criterion effect on the performance of cascaded, sensible, combined sensible-latent heat storage tank for concentrating solar power plants," Energy, Elsevier, vol. 230(C).
    13. Zhao, Bing-chen & Cheng, Mao-song & Liu, Chang & Dai, Zhi-min, 2018. "System-level performance optimization of molten-salt packed-bed thermal energy storage for concentrating solar power," Applied Energy, Elsevier, vol. 226(C), pages 225-239.
    14. Vannerem, S. & Neveu, P. & Falcoz, Q., 2021. "Experimental and numerical investigation of the impact of operating conditions on thermocline storage performance," Renewable Energy, Elsevier, vol. 168(C), pages 234-246.
    15. Ortega-Fernández, Iñigo & Rodríguez-Aseguinolaza, Javier, 2019. "Thermal energy storage for waste heat recovery in the steelworks: The case study of the REslag project," Applied Energy, Elsevier, vol. 237(C), pages 708-719.

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