In order to study the influence of heat transfer performance of solid-state metal hydrogen storage tank based on phase change heat transfer, an experimental platform was built with a solid-state metal hydrogen storage tank based on phase change heat transfer, and the heat absorption behavior of phase change materials in the phase change process was used to dissipate heat during the hydrogen absorption process of the solid-state metal hydrogen storage tank, and the thermodynamic properties of hydrogen storage alloys during the hydrogen absorption process were analyzed. Finally, hydrogen absorption experiments were designed at different melting points, wall thicknesses and hydrogen absorption pressures to test the effects of key parameters such as melting point, wall thickness and hydrogen absorption pressure of different phase change materials on the hydrogen absorption performance of AB5 solid metal hydrogen storage tank. The results show that in the early stage of the reaction, the heat transfer between the wall and the phase change material is mainly by conduction. As the reaction progresses, the phase change material melts, and more high-temperature liquid phase change material flows upward, pushing the upper liquid interface to move, and under the action of gravity, the phenomenon of thermal buoyancy will be generated, and natural convection dominates in the phase change heat. Under the initial conditions, higher hydrogen absorption pressure and thicker phase change material wall thickness both have a promoting effect on hydrogen absorption efficiency. Higher hydrogen absorption pressure will intensify heat exchange behavior, while a thicker phase change material wall thickness can increase the total amount of thermal energy absorbed. At the same time, the lower melting point of phase change materials can improve the hydrogen absorption efficiency of the tanks and accelerate the temperature drop inside the tanks.
Key words
hydrogen storage alloy /
phase change materials /
heat transfer performance /
hydrogen absorption reaction /
temperature /
pressure
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