Mathematical modeling, numerical simulation and experimental comparison of the desorption process in a metal hydride hydrogen storage system

A two-dimensional axisymmetric model is developed to study the hydrogen desorption reaction and its subsequent discharge in a metal hydride canister. Experimental tests are performed on an in-house fabricated setup. An extensive study on the effects of the metal properties and boundary conditions on...

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Bibliographic Details
Published in:International journal of hydrogen energy 2018-08, Vol.43 (35), p.16929-16940
Main Authors: Busqué, Raquel, Torres, Ricardo, Grau, Joan, Roda, Vicente, Husar, Attila
Format: Article
Language:English
Subjects:
Enginyeria mecànica
Experimental testing
Fluid mechanics
Hydrogen desorption
Hydrogen storage
Mecànica de fluids
Metal hydride
Two-dimensional axisymmetric simulation
Àrees temàtiques de la UPC
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Summary:A two-dimensional axisymmetric model is developed to study the hydrogen desorption reaction and its subsequent discharge in a metal hydride canister. Experimental tests are performed on an in-house fabricated setup. An extensive study on the effects of the metal properties and boundary conditions on discharging performance is carried out through non-destructive testing (NDT). Results show that the desorption process is more effective if the activation energy for desorption (Ed) and the reaction enthalpy (ΔH) decrease, and when the desorption rate coefficient (Cd) and the external convection heat transfer coefficient when the bottle is being heated (h) increase. Furthermore, porosity (ε) can be useful for the design of hydrogen storage systems, with a trade-off between charge/discharge time and storage capacity. Numerical and experimental results are compared achieving a good agreement. These results can be used to select metal hydride materials and also for the future evaluation of metal hydride degradation. •A 2D axisymmetric model for H2 desorption in metal hydride storage bottles is done.•Parametric studies to identify the effect of metal properties are performed.•An analysis on the influence of porosity and heating level is implemented.•An experimental setup is designed and built using commercial metal hydride bottles.•Numerical and experimental results are compared showing good agreement.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2017.12.172