March 13, 2006
BMW to display liquid hydrogen storage system and bi-fuel engine at NHA
Long Beach, California – BMW is expected to display a liquid hydrogen fuel storage system and an experimental 7 Series vehicle capable of running on gasoline or hydrogen at the National Hydrogen Association’s (NHA) annual conference later this week in Long Beach, California.
Liquid hydrogen offers a higher volumetric density than gaseous hydrogen, an important consideration in storage, although it presents difficulties of its own, including hydrogen boil-off and a high energy requirement for liquefaction of the gas.
BMW will be presenting a double-walled liquid hydrogen storage system that has approximately 70 layers of aluminum-coated synthetic foil under high vacuum. The company says a 17-metre (50-foot) layer of polystyrene would be necessary to achieve the same insulation effect.