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Wind resources at Horns Rev

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energy. environment. knowledge. Page 31 of 69<br />

Table 3.1 Summary of sonic time series, measured <strong>at</strong> <strong>Horns</strong> <strong>Rev</strong><br />

Year Hours Days Size<br />

1999 310 15 397 MB<br />

2000 773 36 991 MB<br />

2001 5634 242 5.62 GB<br />

2002 2184 93 1.25 GB<br />

Total 8902 386 8.26 GB<br />

The estim<strong>at</strong>ed Weibull distribution based on the sonic u–component measurements is<br />

(A=10.6 m/s, k=2.42, U= 9.36 m/s), and Figure 3.1 shows th<strong>at</strong> the wind speed range 5–<br />

25 m/s is represented very well. The component turbulence intensity including standard<br />

devi<strong>at</strong>ion is shown as a function of sonic speed on Figure 3.1, and the average<br />

turbulence is listed in Table 3.2. The turbulence intensity increases as expected for an<br />

offshore site, due to increased wave height.<br />

Figure 3.1 3-D turbulence <strong>at</strong> <strong>Horns</strong> <strong>Rev</strong>, h=50 m asl<br />

Table 3.2 Average 3-D turbulence <strong>at</strong> <strong>Horns</strong> <strong>Rev</strong>, h=50m asl<br />

Turbulence V=10 m/s V=15 m/s V=20 m/s V=25 m/s<br />

TIu 6.3% 6.8% 8.2% 8.6%<br />

TIv 5.4% 5.5% 6.3% 7.0%<br />

TIw 3.4% 3.6% 4.2% 4.7%<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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