Hydrogen storage in metal hydrides is particularly attractive for the reversible charge and discharge characteristics of the reactions and the large density per unit volume. Solid-state hydrogen absorption is capable to provide volume densities that are larger than most storage methods, but at the expenses of low gravimetric densities (stored hydrogen mass per unit weight of storage system). Metal hydride storage systems (MHSS) present two main physical components. These are the heat management system for alternative cooling/heating of the hydride bed and the pressure vessel, in which the absorbing alloy is contained. The rate at which the gas is absorbed can easily be controlled by simultaneously lowering the system's temperature and increasing the pressure, whereas the opposite is valid for the desorption process. Therefore, the heat management system is the key component in an on-board MHSS and its design is crucial to effectively perform alternate cooling and heating of the hydride bed in order to achieve reaction times of practical interest [1].
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