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Re: [ST] for Brett - fuel economy
- Subject: Re: [ST] for Brett - fuel economy
- From: Matthew Heyer <matthewheyer@xxxxxxxxx>
- Date: Tue, 18 Apr 2006 08:04:30 -0700 (PDT)
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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