For a given
rated output the blade diameter (and therefore the swept area of the blades)
varies from one manufacturer to another. Some manufacturers quote unrealistic
figures for the output to be expected from their turbines. It can be easy to
spot the more optimistic manufacturers by simply comparing turbines with the
same blade diameters. Even if some turbines are more efficient at capturing the
energy in the wind when compared to others the disparity can be obvious. The
table below provides an indication of the blade diameters to be expected for
each size of turbine.
While it is
preferable from a performance point of view to use a turbine mast as tall as
possible certain restrictions such as planning regulations and cost constrain
the use of very high masts. Furthermore turbine masts are generally designed to
suit a particular turbine. They need to cope with the particular resonances and
vibrations generated by the turbine during operation. You may find that you
have limited choice when deciding on a height.
Table 2 below gives an indication of the height of
masts for turbines of various heights. Some suppliers can provide a mast option
(for example 10m or 15m) to suit different sites, applications and conditions.
Suppliers should be fully aware of the requirements for planning exemptions and
often size their masts to meet these regulations.|
Manufacturers'
Rated Power
|
Sample
Blade Diameters (m)
|
Typical
Hub Height (m)
|
|
500 W
|
2.2
|
6-7m
|
|
750 W
|
2.5
|
6-7m
|
|
1 kW
|
2.8
|
6-7m
|
|
2 kW
|
4.0
|
6-10m
|
|
3 kW
|
5.0
|
6-10m
|
|
4 kW
|
5.2
|
6-10m
|
|
5 kW
|
5.5
|
6-10m
|
|
6 kW
|
6
|
6-10m
|
|
10 kW
|
7
|
10-18m
|
|
15 kW
|
10
|
10-18m
|
|
20 kW
|
11
|
10-18m
|
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