This invention provides for an apparatus and a method for operation of a cryogenic
hydrogen storage system that contains a porous medium configured to adsorb hydrogen.
The hydrogen storage and supply system includes a hydrogen source apparatus, a
cryosorptive storage apparatus, and a fuel recycle loop. Methods and devices that
allow for an energy efficient release of hydrogen from the cryosorptive apparatus
are described. At the outset of a fuel release, the cryosorptive hydrogen storage
apparatus contains cold, pressurized hydrogen. Release of hydrogen from the storage
apparatus is a process that consumes heat, thereby drawing down both the temperature
and pressure. Heat can be provided to the cryosorptive storage apparatus by various
direct approaches, or through the influx of warm, recycled hydrogen. The hydrogen
storage and release apparatus contains a recycle loop, which warms a portion of
the effluxing hydrogen, and returns it to the storage apparatus, thereby maintaining
pressure and temperature conditions that support continued hydrogen desorption
from the storage medium.