Wind resources at Horns Rev
Wind resources at Horns Rev
Wind resources at Horns Rev
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energy. environment. knowledge. Page 43 of 69<br />
V h<br />
= V<br />
10<br />
⎡ h ⎤<br />
×<br />
⎢ ⎥<br />
⎣10<br />
⎦<br />
The shear exponent is fitted for each 10-min period, based on free, undistrubed wind<br />
speed signals <strong>at</strong> levels 15, 30, 45 and 62 m. The average shear exponents, with reference<br />
to the wind speed <strong>at</strong> level 62 m, are listed in Table 5.2 for each wind speed bin.<br />
Table 5.2 Bin average wind shear exponent.<br />
Interval Hours < a ><br />
4 < V62 ≤ 6 m/s 3140 0.10<br />
6 < V62 ≤ 8 m/s 4018 0.12<br />
8 < V62 ≤ 10 m/s 4400 0.13<br />
10 < V62 ≤ 12 m/s 3950 0.12<br />
12 < V62 ≤ 14 m/s 2963 0.12<br />
14 < V62 ≤ 16 m/s 1994 0.12<br />
16 < V62 ≤ 18 m/s 1222 0.11<br />
18 < V62 ≤ 20 m/s 589 0.12<br />
V62 > 20 m/s 413 0.12<br />
The wind shear exponent distribution for two wind speed intervals has been determined<br />
and Figure 5.2 shows the distributions.<br />
Figure 5.2 Distribution of shear exponent <strong>at</strong> <strong>Horns</strong> <strong>Rev</strong><br />
5.2 Distribution of gusts<br />
The maximum 10-min speed values lasting 1 and 5 s have been recorded. The analysed<br />
d<strong>at</strong>a represents 23,538 hours of measurements for wind speeds higher than 4.5 m/s. The<br />
gust size presented in this section is the difference between the short-term maximum<br />
value and the 10-min mean wind speed.<br />
α<br />
Report no.: D-160949<br />
Tech-wise A/S is an intern<strong>at</strong>ional consulting Tech-wise A/S<br />
engineering company specialised Kraftværksvej 53<br />
in energy and environment DK-7000 Fredericia
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