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Optimization of tree-shaped fin structures towards enhanced absorption performance of metal hydride hydrogen storage device: A numerical study

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  • Bai, Xiao-Shuai
  • Yang, Wei-Wei
  • Tang, Xin-Yuan
  • Yang, Fu-Sheng
  • Jiao, Yu-Hang
  • Yang, Yu

Abstract

Tree-shaped fins were introduced to improve the heat transfer of metal hydride reactor. A two-dimensional steady-state model was first applied to obtain the optimal geometric structures of tree-shaped fins using genetic algorithm with the constraint of fixed fin mass. Then, the hydrogen absorption performance of MH reactors with embedded radial fins and tree-shaped fins were numerically studied and compared using a multi-physical model. It was indicated that the hydrogen absorption time for 90% saturation for the reactor with optimized tree-shaped fins nearly decreases by 20.7% as compared with that for radial fins. The heat transfer and absorption performance of MH reactor were much sensitive to the length ratio of tree-shaped fins, which can be improved with increasing the length ratio. Besides, the performance of optimized tree-shaped fins reactor with variable angle ratio was only slightly better than that for fixing angle ratio at 1, indicating that the angle ratio of tree-shaped fins can be kept at 1 for simplifying the design. Moreover, the absorption performance of the reactor can be enhanced with increasing the maximum branch level of tree-shaped fins. Furthermore, it was shown that the optimized geometric structures of tree-shaped fins under different MHs thermal conductivities are nearly identical.

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  • Bai, Xiao-Shuai & Yang, Wei-Wei & Tang, Xin-Yuan & Yang, Fu-Sheng & Jiao, Yu-Hang & Yang, Yu, 2021. "Optimization of tree-shaped fin structures towards enhanced absorption performance of metal hydride hydrogen storage device: A numerical study," Energy, Elsevier, vol. 220(C).
    • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328450
    DOI: 10.1016/j.energy.2020.119738
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    6. Zhu, Chen & Mou, Xiaofeng & Bao, Zewei, 2024. "Optimization of tree-shaped fin structures towards enhanced discharging performance of metal hydride reactor for thermochemical heat storage based on entransy theory," Renewable Energy, Elsevier, vol. 220(C).
    7. Bai, Xiao-Shuai & Yang, Wei-Wei & Tang, Xin-Yuan & Yang, Fu-Sheng & Jiao, Yu-Hang & Yang, Yu, 2021. "Hydrogen absorption performance investigation of a cylindrical MH reactor with rectangle heat exchange channels," Energy, Elsevier, vol. 232(C).
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    9. Huang, Xinyu & Li, Fangfei & Li, Yuanji & Meng, Xiangzhao & Yang, Xiaohu & Sundén, Bengt, 2023. "Optimization of melting performance of a heat storage tank under rotation conditions: Based on taguchi design and response surface method," Energy, Elsevier, vol. 271(C).
    10. Krishna, K. Venkata & Kanti, Praveen Kumar & Maiya, M.P., 2024. "A novel fin efficiency concept to optimize solid state hydrogen storage reactor," Energy, Elsevier, vol. 288(C).
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