TPI Questions

[Terry Martin]

Bill Bradley wrote:
> 
> > > Bear in mind that water or water/methanol injection ...
> >
> > you have to alter the air intake
> > to compensate for the fuel displacement if water is injected...
> 
>         Nope.  The water or methanol replaces AIR, not fuel...

Um, okay. I was under the impression that oxygen, being 21% of the Air
charge, was part of the fuel, and the other 79% being nitrogen, argon, &
carbon dioxide were just hanging around because it's too much trouble to
get rid of them. If you throw water in, 21% of the displaced Air is
displaced fuel, hence it runs rich unless an adjustment is made to the
Air charge, ie. turbo boost, or as you said, to the liquid fuel, losing
volumetric efficiency. 

> 
> > it to drive a cooling unit, (like a propane fridge principle)...
> 
>         I've considered the idea of a heat powered heat pump as a killer
> intercooler design...   Both systems also dump more heat OUT
> than you put in, so you have to have a decent cooling system for it as well.

Exactly, and the excess heat coming out is coming from your intake
charge before it's sucked into the cylinder. It just shifts the heat in
the cycle out of the intake flow, to where it doesn't adversely affect
volumetric efficiency. Getting rid of it is easy, just blow it into the
air, since it's only hot air anyhow, and you've both recovered lost heat
energy from the exhaust and improved the volumetric efficiency at the
same time.

Terry



Terry