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The steam reformer needs steam. Energy is needed to obtain steam. Wikipedia mentions an efficiency of 65 to 70% for the steam methane reformer (SMR) to convert methane into hydrogen. And it produces CO2. And then they have to liquify to fill in the hydrogen tank in the car. Another efficiency of 90%. Then the fuel cell will convert hydrogen into electricity, efficient 50%. Then electricity to motive power. Rough total : 29% from methane to motive power. Ooops. Why not burn methane the old way in a combustion engine then, it would be just the same value. The movie is great but not convincing when you look at the figures.
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Apr 22, 2015