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Re: [ST] for Brett - fuel economy



I wonder Matt, do the other PA Engineering schools
cover the theory of heat transfer in their
Thermodynamics and Fluid Mechanics classes?  As a
proud Bison yourself, I'm sure you learned these
principals for Mechanical engineering!

Ken

--- Matthew Heyer <matthewheyer@xxxxxxxxx> wrote:

> There's your tuition's worth of a Lehigh University
> Chemical Engineering degree!  Nice Ken....
>  
> Matt Heyer
> 
> ----- Original Message ----
> From: Ken Nisula <knisula@xxxxxxxxx>
> To: ST@xxxxxxxxxxxxxx
> Sent: Tuesday, April 18, 2006 10:57:49 AM
> Subject: Re: [ST] for Brett - fuel economy
> 
> 
> My understanding is not that an oxygen molecule is
> replaced, otherwise humid days would decrease the
> %O2
> in the air below 21%, rather the water molecule can
> absorb considerably more heat than air alone.  Thus
> more energy from the internal combustion is used up
> heating the excess water vapor in the fuel/air
> mixture, rather than transferring to the overall
> efficiency of the engine.  Thus the best combustion
> weather is a cool, dry day!
> 
> Ken
> 
> --- David Jonas <kahonas@xxxxxxxxx> wrote:
> 
> > On 4/17/06, Emile Nossin <Emile@xxxxxxxxxx> wrote:
> > >
> > > ... moisture should make the air density
> higher).
> > 
> > 
> > I had thought that moisture in the air actually
> > decreased the density, hence
> > why aircraft don't like humid days.  When a water
> > molecule replaces one of
> > oxygen, wouldn't it weigh less?  Atomic weight of
> 2
> > Hydrogens and an oxygen
> > (H2O) is significantly less than that of 2 oxygens
> > (O2).
> > 
> > Somebody with a better grasp on chemistry and
> > weather phenomena please
> > correct me if I'm mistaken.
> > 
> > David
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