Re: Work output - back to ceramic EM - somewhat long

["Doug Johnson" <ur-quattro@msn.com>]

Boy, my energy balance is simpler!  No water cooling to reject heat (One
less component in my equation).  should this make me happy, or sad, that
I've not got the water-cooled turbo?  Answer is different if you're driving
the car or doing the math.  Poop...I lose because I'm solving the more
simple equation!!!

 - Doug

----- Original Message -----
From: Phil Payne <quk@isham-research.demon.co.uk>

> In message <008401bf100c$3a5eb340$473ea8d1@rscnwm.com> "Doug Johnson"
writes:
>
> > Isn't the "ideal gas law" applicable only to isentropic processes, where
no
> > energy is transferred in or out of the system?  Sure, no energy is
> > transferred in or out of the "entire" turbocharger system, but you can't
> > look only at the turbine or the compressor when using this law (i.e.,
the
> > system perimeter would encompass all four gas pipes leading into and out
of
> > the turbo).  Also, need to account for energy of the gasses themselves,
> > going into and out of the "system").  You will need to account for the
loss
> > associated with higher exhaust gas discharge temperature as it leave the
> > turbo.  Sh*t, this is more complicated that can be done with text; it
> > deserves two detailed diagrams to completely understand the changes
being
> > proposed with ceramic coating.  Where am I in error on this one?
>
> Energy lost to cooling on the outer surface of the turbine housing.  In
> a car moving forwards at speed, there's quite an airflow in the engine
> bay.  Also energy radiated into the engine compartment (take a look at
> night) and lost to the oil and water.  All are probably negligible
> compared to the energies carried by the gases.
>
> --
>  Phil Payne
>  UK Audi quattro Owners Club
>  Phone: 07785 302803   Fax: 0870 0883933
>