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

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  •  More BTUs per pound (0+ / 0-)

    Diesel 18,111 BTU/lb
    Liquid hydrogen 51,500 BTU/lb

    "Drop the name-calling." Meteor Blades 2/4/11

    by indycam on Sun Apr 24, 2011 at 06:24:22 PM PDT

    [ Parent ]

    •  Thanks. 3:1 ration for weight (1+ / 0-)
      Recommended by:
      Sneelock

      Volume-wise though - how much larger would a jet's tanks have to be to hold the same amount of BTU's? I think I had heard the same ratio 3:1 for hydrogen vs. diesel. Too bad there are not naturally occurring deposits of hydrogen - it all has to be manufactured. The other bad news is that hydrogen atom is so small that even the best holding tanks would loose 1 - 2 % per day through any material surrounding it.

      OK, later. FN

      "WAR IS PEACE FREEDOM IS SLAVERY FOX NEWS IS JOURNALISM"

      by FakeNews on Mon Apr 25, 2011 at 04:33:40 AM PDT

      [ Parent ]

      •  The airplane above is not a jet . (1+ / 0-)
        Recommended by:
        Sneelock
        The other bad news is that hydrogen atom is so small that even the best holding tanks would loose 1 - 2 % per day through any material surrounding it.
        The bad news is that its hard to keep it from boiling off .

        "Drop the name-calling." Meteor Blades 2/4/11

        by indycam on Mon Apr 25, 2011 at 03:52:12 PM PDT

        [ Parent ]

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