Guidelines for thermal management design of hydride containers

A case study of a hydride container performance applying non dimensional parameters

“…We consider that this tendency can be attributed to the model simplification that considers the radius of the container as the characteristic length, while the fill time calculation (Eq. (6)) assumes this length as the thickness of a 1D slab [6]. According to Eq.…”

“…Outline In a previous work we developed a series of non dimensional parameters that provide an approximate measure of the relative importance of the different factors on the absorption process of a hydride container [6]. It is worth noting the same concepts can easily be applied to desorption dynamics.…”

“…For other cases where the kinetics also acts as a limiting factor, the value of NDFT becomes larger and more difficult to estimate (see Section 3.2 of [6] for further information). We can consider the effect of kinetics being important when NDK is lower than approximately 5.…”

“…This causes important temperature changes that limit the sorption reaction. When analyzing hydride containers both thermal and chemical issues have to be assessed simultaneously obtaining temperature and hydrogen concentration profiles, usually by numerical tools ([2e5] also see Table 1 in the work of Melnichuk et al [6]). These profiles depend on the absorbing material, the container geometry and conductivity, pressure and temperature conditions and hydrogen flow through the metal hydride bulk [7].…”

“…In this work we analyze the reaction time of a prototype hydride container using non dimensional parameters that were presented in a previous work [6]. The objective of this work is to compare the estimated absorption time obtained by non dimensional analysis with experimental results, and to certain extent to validate these theoretical predictions.…”