Environmental Engineering Reference
In-Depth Information
Fig. 2.8
Representation of wind velocity distribution. (
a
) example histogram; (
b
) approximation
by Weibull-functions (Raileigh-function for k = 2)
2.3.2 Power Distribution and Energy
A power value
P
i
(
v
i
) may be attributed to each class i of the distribution
h
i
(
v
i
)
according to (2.2). It is advisable to refer
P
i
to the swept area
A
, to obtain a specific
power value:
p
i
=
P
i
A
=
c
p
2
v
i
3
(2.11)
Note that a power limitation may take place at higher wind velocities. From the
specific power follows a normalized energy distribution:
k
i
=1
p
i
·
h
i
p
i
·
h
i
e
i
=
where
E
=
(2.12)
E
Fig. 2.9
Histograms of wind velocity distribution and normalized energy yield
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