wind power classes

As a guide to wind power development, the U.S. Dept. of Energy defined a wind power scale in the Wind Energy Resource Atlas of the United States, published in 1986.

Wind
Power
Class
At a height of 10 meters (33 ft) Height of 50 meters (164 ft)
Wind
Power Density
(W/m2)
Speed
m/s (mph)
Wind
Power Density
(W/m2)
Speed
m/s (mph)
1 0 – 100 0 – 4.4 (9.8) 0 – 200 0 – 5.6 (12.5)
2 100 – 150 4.4 (9.8) – 5.1 (11.5) 200 – 300  5.6 (12.5) - 6.4 (14.3)
3 150 – 200 5.1 (11.5) – 5.6 (12.5) 300 – 400 6.4 (14.3) – 7.0 (15.7)
4 200 – 250 5.6 (12.5) – 6.0 (13.4) 400 – 500 7.0 (15.7)– 7.5 (16.8)
5 250 – 300 6.0 (13.4) – 6.4 (14.3) 500 – 600 7.5 (16.8) – 8.0 (17.9)
6 300 – 400 6.4 (14.3) – 7.0 (15.7) 600 – 800 8.0 (17.9) – 8.8 (19.7)
7 400 – 1000 7.0 (15.7) – 9.4 (21.1) 800 – 2000 8.8 (19.7) – 11.9 (26.6)

Commercial wind power development becomes feasible around wind power class 4.

A different set of classes was developed by the Massachusetts Technology Collaborative. In them, the wind is measured at a height of 65 meters. Class 1 is 5.5 - 6.0 m/s; the additional classes are defined at intervals of half a meter per second, ending at > 9.5 m/s.

Wind Energy Resource Atlas of the United States

http://rredc.nrel.gov/wind/pubs/atlas/

home | nature index | search| to contact Sizes drawing of envelope | acknowledgements | help|

privacy

terms of use