Re: Funnel Wind Turbine Generates Jaw-Dropping Power

[Bret Cahill]

> Here is a new type of wind generator coming your way soon.I can hear
> deniers yelping, that it killed X numbers of Golden eagles.It might
> even be used to charge my new electric scooter.The article says the
> the cost could be as low as 1 cent per KWh.It won't work in Canada
> because we do not use 1C or pennies anymore so they will have to
> charge more.
>
> http://news.discovery.com/tech/alternative-power-sources/funnel-wind-...

http://news.discovery.com/tech/alternative-power-sources/funnel-wind-turbrine-generates-jaw-dropping-power-130515.htm

Bernoulli's equation alone means it won't be any more efficient than
conventional turbines which already operate at up to 40% efficiency.

According to the mechanical energy balance a venturi effect requires a
pressure drop. Even a small back pressure would cause the air to back
up in the intake and then spill around the entire funnel structure.

The Betz limit of 16/27 or 59.26% maximum efficiency holds for disk
turbines but conservation of mass and conservation of energy hold for
all wind power.

There can not be any great increase in efficiency with this design and
in all likelihood it is much worse than any conventional.

This is either a self deception fantasy like cold fusion or a
conscious scam.


Bret Cahill

[john]

Go stand in the tube.

john

[Bret Cahill]

> > > Here is a new type of wind generator coming your way soon.I can hear
>
> > > deniers yelping, that it killed X numbers of Golden eagles.It might
>
> > > even be used to charge my new electric scooter.The article says the
>
> > > the cost could be as low as 1 cent per KWh.It won't work in Canada
>
> > > because we do not use 1C or pennies anymore so they will have to
>
> > > charge more.
>
> > >http://news.discovery.com/tech/alternative-power-sources/funnel-wind-...
>

> >http://news.discovery.com/tech/alternative-power-sources/funnel-wind-...

>
> > Bernoulli's equation alone means it won't be any more efficient than
>
> > conventional turbines which already operate at up to 40% efficiency.
>
> > According to the mechanical energy balance a venturi effect requires a
>
> > pressure drop.  Even a small back pressure would cause the air to back
>
> > up in the intake and then spill around the entire funnel structure.
>
> > The Betz limit of 16/27 or 59.26% maximum efficiency holds for disk
>
> > turbines but conservation of mass and conservation of energy hold for
>
> > all wind power.
>
> > There can not be any great increase in efficiency with this design and
>
> > in all likelihood it is much worse than any conventional.
>
> > This is either a self deception fantasy like cold fusion or a
>
> > conscious scam.
>
> > Bret Cahill
>
> Go stand in the tube.

No analysis = nothing but bs.


Bret Cahill

[Bret Cahill]

If anyone is considering putting some money into this sham first email
the link above to any mechanical engineering prof at any state
university.

They'll say pretty much the same thing.


Bret Cahill

[emoneyjoe]

I don't see where any Bernoulli effect
is involved, unless the inlet facing the
wind draws air by induction from other
side openings.

To have an inlet the size of the
air mass moving a propeller, the
structure would have to be huge though.

[Bret Cahill]

The mechanical energy balance is always the first thing to look at
when it comes to flow through pipes, converging or diverging,
venturis, nozzles, expanders, etc.

Bernoulli is for invicid flow -- the most elementary analysis in
fluids. No peta flop computers are necessary here. After you get
that right _then_ you start to look at shear, viscosity, plumbing
tables, the equation of motion, super sonic flow, etc.

But they didn't even get the M.E.B. right so they can be summarily
dismissed as cranks without a second thought.

> unless the inlet facing the
> wind draws air by induction from other
> side openings.

Sticking a funnel in the wind doesn't end run conservation of mass and
conservation of energy any more than a disk turbine can end run the
16/27 or 59% efficiency Betz limit.

>       To have an inlet the size of the
> air mass moving a propeller, the
> structure would have to be huge though.

Scaling up won't help here. His problem is Bernoulli, not Reynolds
or Mach.

Bernoulli is so ancient and basic most engineers don't know what
century he lived in.


Bret Cahill