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Using wind power
- Sailing ship
- Windmill
Wind power is the kinetic energy of the movement of air masses caused by the differences in solar irradiation on the earth. Man has been using wind power in the most varied ways since antiquity, just think of ailing ships, kites and windmills. So, today's ultra-modern wind energy plant continue a long story of success.
The energy of the wind which is available for conversion into rotational energy increases with the third power of the wind speed. This means that if the wind speed doubles, the wind energy will increase eight times:
The table shows that fact in relation to the area (m²) through which the wind flows:
m/s | W/m² | m/s | W/m² |
|---|---|---|---|
0 | 0 | 8 | 313,6 |
1 | 0,6 | 9 | 446,5 |
2 | 4,9 | 10 | 612,5 |
3 | 16,5 | 11 | 815,2 |
4 | 39,2 | 12 | 1058,4 |
5 | 76,5 | 13 | 1345,7 |
6 | 132,3 | 14 | 1680,7 |
7 | 210,1 | 15 | 2067,2 |
For an atmospheric density of 1.225 kg/m³, corresponding to dry air at normal atmospheric pressure at sea level and a temperature of 15°C.
The formula for the power density in watts per m² is:
watt=0,5 * 1,225 * v³ where v is the wind speed in m/s.