Yes, I understand about starting friction and rolling friction overhead in
a wind generator and that it must be overcome before there is significant
output.
But as the wind speed rises, and the energy contained in that moving air
rises exponentially, the overhead fades to insignificance.
Then the amount of energy extracted from the wind cannot be more than the
wind contains, the generator cannot be more than 100% efficient, and since
the wind energy goes up to the square of the speed I do not see how the
output of the generator can be more than that.
Norm
S/V Bandersnatch
Lying Julington Creek FL
30 07.72N 081 38.4W
> [Original Message]
> From: Dave Skolnick <[EMAIL PROTECTED]>
> To: <[email protected]>
> Date: 2/5/2008 11:33:07 AM
> Subject: Re: [Liveaboard] Wind Generator Energy
>
> > As for the wind generator question, for me, E=MV^2 is still a valid law
of
> > physics. When the wind doubles in speed, the wind contains four times
the
> > energy. If the wind generator is 100% efficient and extracts all the
> > energy possible then the output also goes up four times. I will not
> > believe the cube thing until I see it proven clearly enough for my mind
to
> > accept it.
>
> I don't think you can make the assumption that wind generator
> efficiency is constant. As I understand it (reference books are in
> storage) the efficiency increases significantly with RPM. That's why
> so many wind generators aren't very effective at low wind speeds.
> There are both mechanical and electrical inefficiencies that change
> (differently) with rotational speed.
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