Wind resources at Horns Rev

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energy. environment. knowledge. Page 16 of 69 Figure 1.7 Directional behaviour measured at Horns Rev, level 28, 43 and 60 m. Mast effects The mast speed-up and mast wake effect at three different levels (15, 30 and 45 m) have been investigated for wind speeds between 5 and 25 m/s with reference to the wind speed direction measured 60 m above sea DNN. Each level is represented with measurements recorded in the SV and NE directions and the cup anemometer locations at each level are listed in Table 1.4. The mast effect is determined as the ratio SV/NE, which is bin-averaged against the wind direction and shown in Figure 1.9-a. This figure shows a very distinct wake effect at all three levels, and it is recommended to use the free, undisturbed wind signal for further analysis. The recommended sectors with free, undisturbed wind speeds are listed in Table 1.5. It should be noted that the large deviations in Figure 1.9-a mainly reflects the deficits measured in the wake of the mast. The difference in the ratio from level to level, mainly reflects the difference in the mast solidity and boom length. Report no.: D-160949 Tech-wise A/S is an international consulting Tech-wise A/S engineering company specialised Kraftværksvej 53 in energy and environment DK-7000 Fredericia
energy. environment. knowledge. Page 17 of 69 Table 1.4 Mast and boom dimensions Level Dimensions Diagonal Boom length 62 m - cup Top mounted Top mounted Top mounted 60 m - vane ? 1.15 1.63 m 4.20 m 45 m - cup ? 1.26 1.78 m 4.35 m 43 m - vane ? 1.29 1.82 m 4.40 m 30 m – cup ? 1.42 2.01 m 4.75 m 28 m – vane ? 1.46 2.06 m 4.80 m 15 m – cup ? 1.81 2.56 m 5.40 m Table 1.5 Recommended free sectors Level Sector Channel/signal 62 0–360° CUP62M 45 168–348° CUP45SV 45 0–168° & 348–360° CUP45NO 30 168–348° CUP30SV 30 0–168° & 348–360° CUP30NO 15 168–348° CUP15SV 15 0–168° & 348–360° CUP15NO Figure 1.8 Boom orientation at the meteorological mast Report no.: D-160949 Tech-wise A/S is an international consulting Tech-wise A/S engineering company specialised Kraftværksvej 53 in energy and environment DK-7000 Fredericia
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