[Vwdiesel] Re: [Audi-VW-Diesels] EGT temps revisited

[Harmon Seaver]

   The Stirling, yes, there's a lot being done with those -- they are an
external heat engine, as opposed to the internal combustion of diesels. The
Swedes have a big submarine powered by one. Some people build small ones out of
tin cans that run quite well. You could power one off the exhaust heat of a
diesel and run an alternator.
   Here's a boat powered by
one. http://www.geocities.com/wastewatts/boatpage.html
   Lots more stuff on stirlings on that site.


On Thu, Sep 19, 2002 at 08:26:52AM -0400, Nate Wall wrote:
> Here's a question: Anyone ever hear of a Sterling, or Sterling cycle, engine? I
> forget the specifics, but years ago I worked for the American Trucking Association,
> and at one of the truck shows the US Department of Energy put a sterling engine in
> a Dodge full-size pick-up truck. I got to drive it around the block a few times at
> the show. Not much power and it had a really odd sound to it.
>
> --Nate
>
> maded wrote:
>
> > Nate and all,
> >
> > Yes, the temp drop is from taking out energy from the gas stream. Air cycle
> > chillers work the same way, except the exit air is cold, real cold.
> >
> > I remember reading a Scientific American article years ago where a guy
> > devised a compound diesel engine to extract more energy out of the fuel
> > (diesels have way more air than used in combustion, that air has energy).
> > He had worked very hard and finally engineered a solution but the
> > complication was not worth the trouble.  This was years before turbos so he
> > ended his article saying something like..."of course today we get the same
> > result in a much more straightforward way, the turbocharger."
> >
> > --
> > Ed Lowe, Seattle
> > 82 Westy diesel upgrading to 1.9td
> > 85 Golf diesel
> > 92 Cabrio
> > 97 Passat Tdi
> > > From: Nate Wall <nwall at opei.org>
> > >
> > >
> > > What causes the temp drop?
> > >  gases expand as they pass through the turbo, giving up
> > > energy (doing work) against the turbine. As that expansion occurrs, the temp
> > > drops.
> > > Remember old steam locomotives? Some of them use a smaller cylinder under the
> > > primary one to expand the steam a second time (the first cylinder exhausts
> > > into
> > > the second) on each set of drive wheels to get greater effeciency.
> > >
> > >
> >
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--
Harmon Seaver
CyberShamanix
http://www.cybershamanix.com