Bioenergy

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WIND POWER
Stands for the energy of the wind transformed
into either mechanical or electric energy
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WIND POWER

• Windmill wind-power plant
• Wind direction, speed
• Experiments
• Wind engines types, output
• Human ecology

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Wind power is ancient and traditionally used
renewable source of energy
The old windmill (Czech Republic) The
wind-power plant on a sea platform (Sweden)
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WIND
The Earths atmosphere is continuously moving due
to changing pressure. The circulation of air
called wind. Wind direction -
weather vane, wind sleeve Wind speed -
Beaufort wind force scale,
anemometers
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Beaufort wind force scale
degree classification of wind speed /
m.s-1/ 0 calm 0,0 - 0,2 1 light
air 0,3 - 1,5 2 light breeze 1,6 - 3,3
3 gentle breeze 3,4 - 5,4 4 moderate
breeze 5,5 - 7,9 5 fresh breeze 8,0 -
10,7 6 strong breeze 10,8 - 13,8
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Beaufort wind force scale
degree classification of wind speed /
m.s-1/ 7 near gale 13,9
17,1 8 gale 17,2 20,7 9 severe
gale 20,8 24,4 10 storm 24,5
28,4 11 violent storm 28,5
32,6 12 hurricane over 32,7
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How to make your own device for measuring speed
wind
Props 2 protractors a table tennis
ball a flat piece of wood or plastic ( a
ruler) strong thread, approx. 15 cm
long a needle a piece of sticky
plasticine
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The working procedure
1. 2. 3. 4.
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A chart for calculating the speed of wind
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Wind engines
Kinetic energy (of the blowing
wind) Rotational energy (of the rotor a wind
turbine) Electricity (generator of
wind turbine ) In each of the transformations,
part of the source energy is turned into heat
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A graph illustrating the percental output of
power plant in relation to wind speed
The equipment tends to use winds whose speeds
range are from 4 to 26 metres per second.
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The design of a typical wind-power turbine with
a horizontal axis
propeller
generator
Gear box
manifold casing
clutch
yawing system
tower
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Wind-power as a renewable source of energy and
Human ecology
Advantages 1.The source of electricity
is inexhaustible and for free. 2.Does not
generate any harmful emissions or residues.
3.Does not produce any greenhouse gasses.
4.Its operation does not need water and
consequently it does not pollute water.
5.Windpower turbines are reliable, need to be
checked only twice a year and their service life
is more than 13 years.
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11.The power plant disturbs television and radio
signals, which can be eliminated by appropriate
choice of technical equipment ?e.g. plastic
rotors ? 12.Turbulence behind the rotors is
negligible and does not reach very far. 13.The
revolving rotor throws flickering shades and
light patterns, which might be unpleasant for
some people 14.In winter the rotor blades may be
covered in frost and pieces of ice may sometimes
fall off. 15.The construction needs certain area
of land and investment. 16.The tall rotor towers
may disturb the scenery, even though somewhere
they have become a sort of local colour. 17.They
can only be built in appropriate localities with
minimum wind speed of 5 mps. In Central Europe,
such localities are generally found at higher
altitudes, and they often happen to be protected
areas. The construction has to take into
consideration the values of the surrounding
landscape.
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• Impact on human health
• positive 2,3,4
• negative 7,13,14
• Impact on environment
• positive 2,3,4
• negative 7,8,9,13,14,16,17