Marlec Eng Co Ltd Installation Instructions
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Document No: SM124 Issue D 30.01.07
5
General Considerations
The location and height of the mounting pole or tower for your wind turbine will
be the major factor in the overall performance of your system. The smooth flow
of wind over land and water is often interrupted by a multitude of obstructions
causing wind sheer and turbulence.
Wind sheer
describes the interference between the fast moving upper air and the
slow moving air close to the ground and the resulting decrease in average wind
speed as one gets closer to the ground.
Turbulence
is caused by the wind passing over obstructions such as trees and
buildings.
Both wind sheer and turbulence diminish with height and can be overcome
simply by putting the machine sufficiently high above them as shown in Fig 1.
Wind speed decreases and turbulence increases where obstructions exist.
Consider also that downwind obstructions can be as detrimental to performance
as upwind obstructions.
WIND DIRECTION
AREA OF TURBULENCE
20H
2H
2H
H
Fig.1
