Wind resources at Horns Rev
Wind resources at Horns Rev
Wind resources at Horns Rev
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energy. environment. knowledge. Page 16 of 69<br />
Figure 1.7 Directional behaviour measured <strong>at</strong> <strong>Horns</strong> <strong>Rev</strong>, level 28, 43 and 60 m.<br />
Mast effects<br />
The mast speed-up and mast wake effect <strong>at</strong> three different levels (15, 30 and 45 m) have<br />
been investig<strong>at</strong>ed for wind speeds between 5 and 25 m/s with reference to the wind<br />
speed direction measured 60 m above sea DNN. Each level is represented with<br />
measurements recorded in the SV and NE directions and the cup anemometer loc<strong>at</strong>ions<br />
<strong>at</strong> each level are listed in Table 1.4.<br />
The mast effect is determined as the r<strong>at</strong>io SV/NE, which is bin-averaged against the<br />
wind direction and shown in Figure 1.9-a. This figure shows a very distinct wake effect<br />
<strong>at</strong> all three levels, and it is recommended to use the free, undisturbed wind signal for<br />
further analysis. The recommended sectors with free, undisturbed wind speeds are listed<br />
in Table 1.5.<br />
It should be noted th<strong>at</strong> the large devi<strong>at</strong>ions in Figure 1.9-a mainly reflects the deficits<br />
measured in the wake of the mast. The difference in the r<strong>at</strong>io from level to level, mainly<br />
reflects the difference in the mast solidity and boom length.<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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