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Assessing the impact of a novel hemispherical diffuser on a single-tank sensible thermal energy storage system

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  • Parida, Dipti Ranjan
  • Advaith, S.
  • Dani, Nikhil
  • Basu, Saptarshi

Abstract

The effects of an inlet inertial jet on the thermal blending of hot and cold heat transfer fluid (molten salt) for a single tank sensible thermal energy storage system are studied using numerical simulations. The simulations show the evolution of the initial stratified layer (thermocline) for a temperature difference of 300 K with a corresponding Atwood number (At) of 0.066. Three diffuser arrangements are investigated: a flat plate solid diffuser, a coaxial ring diffuser with a solid center, and a proposed hemispherical diffuser. The thermal stratifications are examined by a mathematical model named Ideal stratification index (ISI). It is observed that the buoyancy-driven mixing is minimum for the hemispherical diffuser, and the resulting thermocline is 6% better compared to alternative diffusers at 27 l/min. Additionally, the working of the proposed diffuser is demonstrated via experiments with a saline-freshwater combination. These results reveal that the single tank thermocline storage performance can be improved for higher charging/discharging rates using hemispherical diffusers.

Suggested Citation

  • Parida, Dipti Ranjan & Advaith, S. & Dani, Nikhil & Basu, Saptarshi, 2022. "Assessing the impact of a novel hemispherical diffuser on a single-tank sensible thermal energy storage system," Renewable Energy, Elsevier, vol. 183(C), pages 202-218.
    • Handle: RePEc:eee:renene:v:183:y:2022:i:c:p:202-218
    DOI: 10.1016/j.renene.2021.10.099
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    1. Untrau, Alix & Sochard, Sabine & Marias, Frédéric & Reneaume, Jean-Michel & Le Roux, Galo A.C. & Serra, Sylvain, 2023. "A fast and accurate 1-dimensional model for dynamic simulation and optimization of a stratified thermal energy storage," Applied Energy, Elsevier, vol. 333(C).
    2. Szczęśniak, Arkadiusz & Milewski, Jarosław & Dybiński, Olaf & Futyma, Kamil & Skibiński, Jakub & Martsinchyk, Aliaksandr, 2023. "Dynamic simulation of a four tank 200 m3 seasonal thermal energy storage system oriented to air conditioning at a dietary supplements factory," Energy, Elsevier, vol. 264(C).
    3. Elfeky, Karem Elsayed & Mohammed, Abubakar Gambo & Ahmed, Naveed & Wang, Qiuwang, 2023. "Thermo-mechanical investigation of the multi-layer thermocline tank for parabolic trough power plants," Energy, Elsevier, vol. 268(C).
    4. 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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