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Bubble-driven flow enhancement of heat discharge of latent heat thermal energy storage

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  • Choi, Sung Ho
  • Ko, Han Seo
  • Sohn, Dong Kee

Abstract

In this paper, the use of bubble-driven flow on phase change material (PCM) is proposed to improve the discharge performance of a latent heat thermal energy storage system (LHTES). The upward momentum of bubbles due to its density difference can agitate liquid PCM and increase the flow velocity of liquid PCM to enhance heat transfer between the heat transfer fluid (HTF) and the PCM. To analyze the mechanism of enhanced heat transfer, visualization techniques of particle image velocimetry (PIV) and shadowgraphy were used. The result showed that the discharge time of LHTES decreased by 6%–12%. The increased flow velocity by bubble-driven flow could be observed and the expanded phase change region away from the solid/liquid interface could be identified. The average convective heat transfer coefficient is increased by maximum 1.79 times during the heat discharge period. This mechanism could accelerate the solidification process and enhance the energy discharge rate of the LHTES. Bubble-driven flow could be successfully applied to PCM to improve LHTES discharge performance.

Suggested Citation

  • Choi, Sung Ho & Ko, Han Seo & Sohn, Dong Kee, 2022. "Bubble-driven flow enhancement of heat discharge of latent heat thermal energy storage," Energy, Elsevier, vol. 244(PB).
    • Handle: RePEc:eee:energy:v:244:y:2022:i:pb:s0360544222000718
    DOI: 10.1016/j.energy.2022.123168
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    4. Tian, Shen & Ma, Jiahui & Shao, Shuangquan & Tian, Qingfeng & Wang, Zhiqiang & Zhang, Zheyu & Hu, Kaiyong, 2024. "Experimental and analytical study on continuous frozen/melting processes of latent thermal energy storage driven by bubble flow," Energy, Elsevier, vol. 290(C).

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