Thermal effects in dynamic storage of hydrogen by adsorption

Thermal effects in dynamic hydrogen storage by adsorption at room temperatu re and high pressure are studied theoretically and experimentally. The syst em of adsorbate-adsorbent used was hydrogen in granular activated carbon. T he theoretical analysis was based or heat- and mass-transfer modeling in a packed-bed adsorber; with particular emphasis on the thermal effects occurr ing during charge and discharge steps. The influence of gas flow rate and s torage pressure (up to 15 MPa) on the total amount stored or delivered was investigated. Operating conditions were compatible with practical applicati on for onboard vehicle storage. The experimental study was carried out in c ylindrical 2-L reservoirs filled with granular activated carbon which the b ed temperature was measured at various positions. The temperature changes d uring both charge and discharge charge agreed well with the model predictio ns.