Re: Ammonia as fuel

On Oct 20, 3:17 pm, ivk <ivk2...@xxxxxxxxxxx> wrote:
No good for jet aircraft. The fuel tanks would have to be at least four times
the size and there's no room for that.

Yes, 4 times the volume of the current jet fuel, and about 1/3 by
weight. Even now, I think, the best jets on long flights spend just
about 4 litres of fuel per passenger per 100km, so it will be 16
litres of hydrogen. So on 5000 km transatlantic flight it will be 800
litres, less than 1m3, per passenger. Obviously a passenger seat takes
more volume (at least 3m3 on economy class, I would think), so I don't
see a problem.

Okay dude, you've got a few problems here. The fuel on current
jets is stored in the *wing* look at relative volumes here and you
will see that 3 times the volume would fill half the fuselage as
well. That's one. 2 is that the high pressure cryogenic tanks that
would be needed are rather heavy, unwieldy, prone to leaks and
generally tetchy. Including the storage tanks, there would be no room
whatsoever on the plane for passengers. If it comes to running jets
on h2, we stop running jets.
Hydrogen is basically a non-starter as fuel. At best, the total
process efficiency is in the neighborhood of 10%. That's pretty
miserable.
The next generation of cars will either be fueled by a
combination of grid electricity nuclear derived, and liquefied coal,
or they will stay still. There are no other viable options, hydrogen
is simply too stupid to contemplate.

.

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