Flyer
2
Gnomon is a simplified version of a sun dial: a sharp rod is fixed on a normal base, and the evolution of its shadow permit us to follow sun’s path. In order to have a reliable experiment, the gnomon must be stable during all the observations. In order to avoid than the operator comes to take bearings of its shadow; and quote the hour, we use a webcam and make a picture of the gnomon area every minute. The gnomon is normal to the base, one of its axes is oriented North-South with a compass. The base is positioned on horizontal line with a level square and three screws. With this picture from the webcam we can reckon the height and the azimuth. This system uses only physics properties for the rotation of the solar cells. It follows only the azimuth of the sun (see calculation poster). It uses dilation and gravity . This system does not use any other energy. More info on the Web site: Write: “sunfollower” in a search engine and you find us… http://tinyurl.com/4tngtw Contact: [email protected] A follower system without any engine!
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Transcript of Flyer
Gnomon is a simplified version of a sun
dial: a sharp rod is fixed on a normal
base, and the evolution of its shadow
permit us to follow sun’s path. In order to
have a reliable experiment, the gnomon
must be stable during all the
observations.
In order to avoid than the operator
comes to take bearings of its shadow; and
quote the hour, we use a webcam and
make a picture of the gnomon area every
minute.
The gnomon is normal to the base, one of
its axes is oriented North-South with a
compass. The base is positioned on
horizontal line with a level square and
three screws.
With this picture from the
webcam we can reckon the
height and the azimuth.
This system uses only physics properties for the rotation of the
solar cells. It follows only the azimuth of the sun (see calculation
poster). It uses dilation and gravity. This system does not use any
other energy.
More info on the Web site:
Write: “sunfollower” in a search engine and you find us…
http://tinyurl.com/4tngtw
Contact: [email protected]
A follower system without
any engine!
Rotation
according to
the days
Rotation
according to
the hours
Latitude
setting
Our first prototype
with a polar rotating
axis
Comparison
between the
fixed and the
following solar
module (During
a sunny Day in
November
2007)
P is a fixed value of the sun power, received before atmosphere
per square meter. We choose P=1kW/m²
h is the height of the Sun (see gnomon)
A is the azimuth of the Sun (see gnomon)
m is the coefficient of the atmosphere thickness (the same than
in astronomy. m=1/sin h
E0 is the energy received by the following modules E0=P x t/m with E0 in kWh/m², P in kW/m² et t in h.
E1 is the energy received by fixed module with a slope of 45° to the south: E1= E0 SIN(45+h) COS(A)
E2 is the energy received by following module tracking only the azimuth, his slope is 45° E2= E0 SIN(45+h)
This testing ground is used
to measure the power
produced by the solar cells
according to the angle
between the sun rays and
the cells.
