Page 125 - Fluid Power Engineering

102 Chapter Six

Frequency (%)
0-5 m/s
N 5-10 m/s
12.5 NNE 10-15 m/s
NNW
10 15-20 m/s
ENE 20-40 m/s
WNW

W E
10

WSW ESE

SSW S SSE

(a)

Mean wind speed (m/s)
N
MNN NEE
8

6
NEE
NWW
4
2

W E
2 4 6 8

SWW SEE

SSW S SSE

(b)

FIGURE 6-15 Wind rose for Valentine, Nebraska. (a) Frequency rose with
relative frequency of different wind speed ranges in different sectors
(see Fig. 6-12); (b) average wind speed in each sector; (c ) energy density in
each sector.