水素吸蔵合金を用いた水素貯蔵容器内の伝熱促進 : 伝熱フィン最適設置条件の検討

概要

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Optimization of fin arrangement in a metal hydride (MH) bed has been sought with calculations to enhance heat transmission in a hydrogen storage tank and get the maximum hydrogen absorption rate. Two different fin configurations such as radial and circular fins in a vertical cylindrical reactor vessel using a La Ni based AB 5 type hydrogen storage alloy were tested. Two dimensional transient heat conduction analysis in the bed coupling with exoergic hydriding reaction predicted temperature and absorption of hydrogen. Those agreed with some experimental results within 6 K and 8.5%, respectively. Hence effects of thickness, spacing and shape of fin on hydrogen absorbing rate were analytically evaluated and optimum range of the each fin arrangement was decided according to a trade off between absorption time and reduce of the MH volume due to the fin volume. At most the hydrogen absorbing time for the recommended fin layout may reduce to about one-third of that without fin.
社団法人日本機械学会の論文
2006-06-25