Math Question

[Mark Pitts]

Thought I was vaguely on the right track.... Now.... Water.

Is this the case:

Water absorbs energy as it does the transition from liquid to gas. This =
transition is 1 Joule per cc.

So by letting the water absorb the energy, without increasing gas temp, =
but definitly increasing cylinder pressure, we are absorbing heat, and =
turning it into torque???

Just want to make sure that I'm not being stupid!

Mark ;-)


----------
From:  John Napoli[SMTP:jgn at li.net]
Sent:  Wednesday, September 18, 1996 11:25 AM
To:  Mark Pitts
Cc:  diy_efi at coulomb.eng.ohio-state.edu
Subject:  RE: Math Question

Yes, and the key phrase is 'to an extent'.  There is still a lot of =
waste
heat out the tail pipe and in the radiator and etc.  A turbo is a step =
in
the right direction but there are still a lot of BTUs being 'wasted'.

John

On Wed, 18 Sep 1996, Mark Pitts wrote:

> Surly that is effectively what a turbo does to an extent, esp. in =
diesels ??? (I might have it wrong here)
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> Mark
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> ----------
> From:  John Napoli[SMTP:jgn at li.net]
> Sent:  Tuesday, September 17, 1996 11:15 PM
> To:  diy_efi at coulomb.eng.ohio-state.edu
> Subject:  Re: Math Question
>=20
> This issue of thermodynamic efficiency is one of my hot points (ouch).
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> Fossil fuel plants use every trick in the book to recapture all the
> 'waste' BTUs that they can.  If you neglect the power used to run =
their
> pollution devices (a parasitic loss), their overall efficiency is =
pretty
> good - I recall numbers in the mid-40s.
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> Our gasoline engines in our cars do nothing to utilize the energy in =
the
> waste heat.  Arre they 10%? 20% efficient overall?  I doubt 20% but =
lets
> go with that number.
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> If we were able to utilize a third of the waste heat, wouldn't that =
make a
> big difference?  Instead of raising CAFE with smaller and lighter =
cars, we
> would raise it by being more efficient.  I doubt that all the EFI =
software
> in the world will make much more MPG than we see right now.  I would =
like
> to see something intelligent about using the waste heat.
>=20
> John
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