Design and Access Statement Site: Lyng Farm, NR20 4JE
NR20%204JE%20Design%20and%20Access%20Statement.pdf
NR20%204JE%20Design%20and%20Access%20Statement.pdf
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<strong>Design</strong> <strong>and</strong> <strong>Access</strong> <strong>Statement</strong><br />
<strong>Site</strong>: <strong>Lyng</strong> <strong>Farm</strong>, <strong>NR20</strong> <strong>4JE</strong><br />
Wind System Noise Emission<br />
The Evance R9000 wind system has been tested under certification conditions (reference<br />
Certificate Number MCS WT0039). The graph below gives the test data which in turn generates<br />
a Sound power level (dB) - based on LA,90 at 8m/s wind speed of 89.0dB <strong>and</strong> a noise slope of<br />
2.095dB per m/s wind speed.<br />
Immission Level against Background Noise Levels<br />
Taking the sound power emitted against wind speed <strong>and</strong> comparing it with typical background<br />
noise minimum levels for a very low noise, rural site provides a clear indication of the relative<br />
noise levels. However the background noise data used is taken at 10m height <strong>and</strong> the Evance<br />
system used is at 15m height. This means that the effective wind speed at 15m will be higher<br />
than that used at 10m for the background noise data by an amount equivalent to<br />
factor of 1.0845. Correcting the data provides a revised table of background noise against wind<br />
speed at 15m as follows:<br />
or a<br />
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