Re: H2 as the motor fuel of the future
- --- In
Yodda Pierce <ntsl532@...> wrote:
> It was interesting to read the DOE hydrogen reportNo. The only thing that can leak anywhere near
> to see that hydrogen is flammable at a very wide range of
> mixtures from 4-75%, while gasoline is only flammable
> from 1-7.6%. Gasoline has a very limited and narrow range
> for flammability compared with hydrogen.
> Also, the article discussed the leakage issues surrounding
> hydrogen. It would seem that hydrogen presents a much
> greater leakage concern than other gas and liquid fuels.
> The report does discuss that the hydrogen gas can diffuse
> easily, however, what if the gas leaked into the passenger
> compartment of the car. Is there a tracer gas with it?
as well as hydrogen is helium.
> If not then it is orderless and you can't smell itI understand the minimum spark energy to ignite H2-air
> unlike gasoline leaks.
> You could have a hydrogen gas leak into the passenger
> compartment and someone could light a cigarette
> and the whole car blows up.
is much less than for any other fuel-air mixture.
Just shifting in one's seat would probably do it.
Thus, in the hydrogen accident postmortems I've read,
I have seen no evidence that they even tried to figure
out what the ignition source was. Could have been anything.
All this, I learned *after* I noticed that it's not
the zero-local-emission fuel with the lowest mass
per unit energy; not unless you have a thousand-tonne car.
And in that case, you would probably want direct nuclear
--- G.R.L. Cowan, H2 energy fan 'til ~1996