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View Diary: Recent DOE Break-Through with Hydrogen Fuel Cells, should make them Affordable (275 comments)

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  •  I think it's mainly applied to (4+ / 0-)
    Recommended by:
    JeffW, Erasmussimo, OtherDoug, Odysseus

    larger vehicles, like buses or trucks, but I don't really know. You'd want to vent your garage pretty well, eh?

    Most of the smaller vehicles I am aware of use CNG, compressed natural gas. No leaks necessary there. Although methane leakage does occur to some extent in any handling system I suppose, just a question of how much.

    Moderation in most things. Except Reactors. IFR forever!

    by billmosby on Sun Apr 24, 2011 at 09:09:07 AM PDT

    [ Parent ]

    •  Another point... (2+ / 0-)
      Recommended by:
      billmosby, OtherDoug

      ...there are fuel cells that will run on natural gas, emitting carbon dioxide as well as water vapor. They require catalysts, too, but may be able to take advantage of these discoveries. The big problem is that they have higher operating temperatures than hydrogen fuel cells, so you have to provide for insulation and cooling.

      Float like a manhole cover, sting like a sash weight! Clean Coal Is A Clinker!

      by JeffW on Sun Apr 24, 2011 at 09:21:22 AM PDT

      [ Parent ]

    •  CNG versus CH (2+ / 0-)
      Recommended by:
      billmosby, OtherDoug

      Obviously, the constraint on CNG is the amount of energy you can store per unit volume. I wouldn't expect it to be much, although perhaps high strength materials would permit high enough pressures to store an adequate amount of CNG.

      But the same considerations apply to hydrogen -- and the volumetric energy content of H2 gas is less than that of CH4 gas. On the other hand, we should get higher energy efficiency out of a fuel cell. Hmm....

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