Projekt Energie

Hydrogen storage, part 2

Cryogenic liquid hydrogen (LH2)

  • LH2 has a density of 70.8 kg/m3 at normal boiling point (–253 °C)
  • Uncompressed G2L à volume reduction 99.9%
  • Advantage of LH2  à high storage density at relatively low pressures (LH2 at atmospheric pressure has 75 % more energy and 1/5 Volume than H2 at 700 bar, ambient temperature)
  • LH2 (mass to volume performance) àimportant for transport sector. Demonstrated in commercial vehicles (BMW) in the future could be co-utilized as aircraft fuel
  • R&D : more efficient liquefaction processes (power requirements: ca. 1/3 of the stored energy),  reduce costs and improve the insulated containers.

Liquefied storage

Vacuum-insulated storage tank

  • Indoor and outdoor tank thermos flask principle
  • Space between two containers (30 mm)
  • Insulation layer up to 70 layers of aluminum foil, alternating with glass fiber mats
  • This super insulation corresponds to the insulation effect of a 17 m thick layer of Styrofoam