Swept
Area:
The swept area of the H.A.W.T.
propellers directly impact
Wind Turbine Economics. Therefore;
the larger the swept area,
the mroe wind is harnessed;
the more electricity is produced
which has a direct effect on
the Costs per Kilowatt.
Aerodynamics
101 (applied to propeller geometry)
clearly states: Power curves
(resultant coefficients) are
related to a point located
2/3 from the orbital axis.
For Example, the above diagram
has a swept area of 120' therefore
only 30' of this massive propeller
can provide enough energy to
drive a 750 KW generator.
http://www.ndsu.nodak.edu/ndsu/klemen/Perfect_Turbine.htm
Wind
Turbines are limited by what
is called the Betz law. Simply
put, if you capture 100% of
the energy available in the
wind, you stop the wind. Obviously,
the wind will stop flowing
through such a turbine. The
opposite of that is that if
you don't capture any energy
in the wind, you don't need
a turbine. The wind is able
to flow around any major obstruction.
The Betz limit says that essentially,
if you capture 59.6% of the
energy in the wind, that is
the best compromise between
stopping the air and forcing
it to go around your machine.
You need to maintain the flow
of air, that's the compromise
any wind machine must make
wheter it is a horizontal axis
(traditional style turine)
or vertical axis turbine, with
many blades or few, or any
such combination. It's covered
by the Betz limit.
Top
View of the Maraih VAWT Turbine
Each
blade has a radius of 10' starting
at its Oribital Axis. The curved
geometry maximizes Energy Caputre
Capacity, therefore, we can
argue the Power Coefficient/Resultant
Curve starts at the Orbital
Axis and ends at the Swept
Area.
This
unique design boasts a 60%
increased efficiency over HAWT.
Two
of the more notable features
of the Mariah Turbine are:
1.
Gravitational Physics/Laws:
Our orbital axis is ona vertical
plane, therefore, gravitational
forces do not inhibit the rotation
of the turbine.
2.
Drag Coefficient Laws
The geometry of the blades
minimize drag by 4:1 over HAWT.
Summary
:
If we were to employ a metaphor;
the "David and Goliath" is
most appropriate. The Mariah Turbine (VAWT) @ 30' (total)
in height as apposed to the massive 130 foot HAWT clearly
stands out as the winner in its ability to capture
energy from the wind. Conservative estimates based
on Aerodynamics, Laws of Motion, & Gravitational
Mechanics reveal an Energy Coefficient Ratio of 10:1
in favour of Mariah's V.A.W.T. over H.A.W.T technology.
