Although heat management during hydrogen adsorption/desorption in metal hydride (MH) reactor using phase change material (PCMs)-based energy storage system has been researched in the last years, very limited data on large-scale applications is found. In this work, a 2D transient numerical model has been developed on Fluent 15.0 CFD platform to assess the performance of hydrogen desorption with consuming heat reduction in a large-scale metal-hydride (MH) storage reactor packed with LaNi5 and 4 MF-PCM (i.e. Metal Foam-Phase Change Material) tubes distributed in the MH-bed. The model was firstly validated by comparing the simulation outcomes with experimental data from other works. Mass and heat transfer resulted in the different parts of the cylindrical MH-MF-PCM reactor were analyzed; where the temporal temperature and energy profiles (average and contours), the MH-dehydrogenation kinetics, and the PCM solidification rate were established for different MFs (i.e. aluminum, copper, nickel and titanium) of varying porosities (10 to 100%). Outstanding results were found. The MF-PCM unit enhanced the MH performance (dehydrogenation) by discharging its latent heat to the MH-bed. The MH was completely discharged within ~700 s. Metal foams accelerated the PCM-solidification rate and the heat releasing to the MH, mainly when lower MF porosities are adopted (i.e. increasing the thermal conductivity of the PCM). The lower the MF porosity (the higher the conductivity), the higher is the energy lost during the sonification process. The PCM solidified rapidly with copper and aluminium MFs instead of nickel and titanium (thermal conductivity effect), with strong dependence on the tubes' position in the reactor bed. The PCM-tube above the H2-charging/discharging pipe solidifies more quickly than the other tubes, presumably to the gravitational effect. In conclusion, the solidification progress of the PCM in the different MF systems was markedly improved in the presence of lower porous MF of higher conductivity (Al and Cu), where the tube position plays a crucial role.