On or around Thu, 17 Jul 2003 22:29:44 +0100, Stewart
enlightened us thusly:

From a point at sea, to the circles of your mind, this is Austin
Shackles:


I like the idea of using all that cold which is otherwise wasted when
running the engine.

Actually, you are (normally) using the heat which is otherwise wasted.
In this respect I suppose you are adding to nett efficiency.

In a way. You use the (mostly unwanted) heat from the engine to get rid of
the unwanted cold in the vapouriser. What I plan to do is to use unwanted
heat in the air entering the cabin to do the same trick.

If your plan will end up drawing the same amount of heat out of the
air, into which all waste heat from the engine is lost anyway, then
the overall system efficiency will not be affected. But if the
vapourised gas being drawn into the engine ends up being colder than
usual, then I guess you are going to be running your engine less
efficiently.

cooling the incoming air in the engine actually adds efficiency, hence
intercoolers on diesels. But what I'm trying to do is to cool the air
coming into the cabin. Mind, I suppose the gas going into the engine will
be cooler as well, as you say, but that should help engine running, not
hinder it - ever noticed how things run better on cold frosty mornings?

I would also guess that the quantities will be small, but just thought
I'd add some extra factors for you to calculate on the back of that
envelope.

I'm more of a "suck it and see" type engineer :-)


--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"Nessun maggior dolore che ricordarsi del tempo felice nella miseria"
- Dante Alighieri (1265 - 1321) from Divina Commedia 'Inferno'