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Wall impact on efficiency of packed-bed thermocline thermal energy storage system

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  • Xie, Baoshan
  • Baudin, Nicolas
  • Soto, Jérôme
  • Fan, Yilin
  • Luo, Lingai

Abstract

Packed-bed single-tank thermocline system with reduced cost is an alternative to the conventional two-tank system for thermal energy storage. This work systematically explores the wall impact on thermocline behavior of packed-bed tanks. For this purpose, adapted transient models were developed and fully exploited for the first time. Two tank configurations were investigated and compared: a high-temperature pilot-scale tank with a steel wall and a low-temperature lab-scale tank with a polycarbonate wall, both tanks being insulated by mineral wool. Results showed that the maximum energy stored in the wall at fully charged state can be up to 10% of the total stored energy. This part of stored energy has a negative impact on the discharging, causing up to 15% increase of the thermocline thickness. The energy stored in the insulation is very small so that this phase can be simplified as a thermal resistance in the modeling. The optimal wall parameters for packed-bed TES tanks were obtained that a thinner wall has a smaller impact on the energy and exergy efficiencies at the discharging cutoff time. The findings of study could provide useful design guideline for pack-bed thermocline TES tanks for different industrial applications.

Suggested Citation

  • Xie, Baoshan & Baudin, Nicolas & Soto, Jérôme & Fan, Yilin & Luo, Lingai, 2022. "Wall impact on efficiency of packed-bed thermocline thermal energy storage system," Energy, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:energy:v:247:y:2022:i:c:s0360544222004066
    DOI: 10.1016/j.energy.2022.123503
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    Cited by:

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    2. Tian, Lei & Wang, Jiangjiang & Zhao, Lei & Wei, Changqi, 2023. "Unsteady-state thermal performance analysis of cascaded packed-bed latent thermal storage in solar heating system," Energy, Elsevier, vol. 272(C).
    3. Ouyang, Tiancheng & Qin, Peijia & Xie, Shutao & Tan, Xianlin & Pan, Mingming, 2023. "Flexible dispatch strategy of purchasing-selling electricity for coal-fired power plant based on compressed air energy storage," Energy, Elsevier, vol. 267(C).
    4. Xie, Baoshan & Baudin, Nicolas & Soto, Jérôme & Fan, Yilin & Luo, Lingai, 2023. "Experimental and numerical study on the thermocline behavior of packed-bed storage tank with sensible fillers," Renewable Energy, Elsevier, vol. 209(C), pages 106-121.
    5. Schwarzmayr, Paul & Birkelbach, Felix & Walter, Heimo & Hofmann, René, 2023. "Standby efficiency and thermocline degradation of a packed bed thermal energy storage: An experimental study," Applied Energy, Elsevier, vol. 337(C).
    6. Mao, Qianjun & Cao, Wenlong, 2023. "Effect of variable capsule size on energy storage performances in a high-temperature three-layered packed bed system," Energy, Elsevier, vol. 273(C).
    7. 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).

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