The Ghost In The Machine wrote:


If one assumes 4 atm for a fuel cell one still gets 793 3/4 gallons -- an
energy density by volume of 0.34%, when compared to gasoline,
if my computations are correct.


The supposedly higher energy density by weight of hydrogen is totally
useless for terrestral apps.

You have to consider the CONTAINED energy density by weight, which is
ALWAYS ridiculously less than gasoline.

As to energy density by volume, gasoline offers 9000 watthours per
liter, while STP hydrogen offers 2.7 watthours per liter electrically
recoverable or 3.3 watthours per liter total heat recovery.

At 4 BAR pressure, hydrogen offers 10.8 watthours per liter, or about
1/833rd that of gasoline. About 0.12 percent.

At 100 BAR pressure, hydrogen offers 270 watthours per liter, or about
1/33rd that of gasoline.

There is, of course, more hydrogen in a gallon of gasoline than there is
in a gallon of liquid hydrogen.

See http://www.tinaja.com/glib/energfun.pdf for a detailed analysis.

--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email:

Please visit my GURU's LAIR web site at http://www.tinaja.com