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0.35
CPT(k=1.4)
CF(k=1.4)
CPT(k=1.6)
CF(k=1.6)
0.3
CPT(k=1.8)
CF(k=1.8)
CPT(k=2.0)
CF(k=2.0)
0.25
0.2
0.15
0.1
0.05
0
0
2
4
6
8
10
12
14
Vave (m/s)
Figure 17: A sample calculation of captureability and capacity factor of a SWT
with parameters annual mean wind speed and Weibull parameter k .
Using the power curve of a 1 kW SWT, expected captureability C PT and capacity
factor C F are shown for different wind Weibull shape parameter k in Fig. 17.
As a conclusion, an optimal design concept is to design a WT and choose a site
so that the captureability is maximized. This is the same as traditional optimal
design concept to maximize the annual energy product. In spite of this fact, there
are wide tendency to evaluate WT plants by capacity factor.
Therefore, a performance evaluation should be done by captureability rather
than by capacity factor.
References
[1] IEC 61400-2 2 nd Ed., Wind turbines - Part 2: Design requirements for small
wind turbines, 2006.
[ 2] Hansen, Martin O.L., Aerodynamics of Wind Turbine , Earthscan, 2008.
[ 3] Matsumiya, H., et al. , Field Operation and Track Tests of SHWT “Airdolphin”
under High Wind Conditions, EWEC2008, 2008.
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