neighbourhood-planning-wind-guidance
neighbourhood-planning-wind-guidance
neighbourhood-planning-wind-guidance
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
How to identify suitable areas for onshore <strong>wind</strong> development in your <strong>neighbourhood</strong> plan<br />
A simple way of understanding the height of these structures and whether they/it could be seen from a<br />
specific location (a historic building for example) is to obtain a helium filled weather balloon and fix it at the<br />
proposed ultimate height (please be careful when doing this). You can then visit a variety of locations to<br />
gauge whether it is possible to see it or not. This is not absolute proof of anything, but is an easy way to<br />
establish some first principles without having to resort to more expensive studies.<br />
Trade-offs between turbine height and power output<br />
When it comes to <strong>wind</strong> turbines, size matters. Smaller turbines obviously have less visual impact, but taller<br />
turbines with longer blades can supply many more homes with power, so in many cases it may be better to<br />
put up a single big turbine than several small ones, provided this carries community support.<br />
Taller turbines can pick up the faster <strong>wind</strong>s that blow at greater heights; if you double the <strong>wind</strong> speed you<br />
generate 8 times as much power. The power output is also proportional to the swept area of the blade<br />
(within the shaded areas in the graphic below). If the length of the blades is doubled, power output is<br />
quadrupled. So a 15 meter 10kW turbine will typically generate enough electricity to power the lights and<br />
appliances of 5 average houses over the course of a year while a 80 meter 2.5MW turbine supplies enough<br />
for around 1,350. So a turbine five times the height generates about 270 times as much electricity.<br />
Figure 3: Comparing the annual output of different sizes of <strong>wind</strong> turbine. The figures are based on typical outputs and<br />
<strong>wind</strong> speeds and are on the conservative side. The height is measured at the hub, and is within the typical range for<br />
turbines of this rating. Each yellow square (n) represents one house.<br />
Rating: 10kW<br />
Rating: 100kW<br />
Rating: 1MW<br />
Rating: 2.5MW<br />
Diameter of<br />
swept area 9m<br />
Diameter of<br />
swept area 22m<br />
Diameter of<br />
swept area 52m<br />
Diameter of swept area:<br />
100m<br />
Height: 15m<br />
Height: 30m<br />
Height: 60m<br />
Height: 80m<br />
Annual output:<br />
22,800 kWh<br />
Annual output:<br />
209,000 kWh<br />
Annual output:<br />
2,190,000 kWh<br />
Annual output:<br />
5,457,000 kWh<br />
Homes: 5<br />
Homes: 50<br />
Homes: 550<br />
Homes: 1,365<br />
nnnnn<br />
nnnnnnnnnn<br />
nnnnnnnnnn<br />
nnnnnnnnnn<br />
nnnnnnnnnn<br />
nnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnn<br />
How did we work all this out? See www.cse.org.uk/downloads/file/<strong>neighbourhood</strong>-<strong>planning</strong>-<strong>wind</strong>-<strong>guidance</strong>-calculation-fig3.pdf<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn The hub of the<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn London Eye is<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn about 65 meters<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn above the ground<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn<br />
www.cse.org.uk<br />
17
Change language