Power

Purly physical power (P) is defined as the rate at which work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time.

 

The power per m² is calculated as such: Air density in kg/m³ multiplied with the third power of the wind speed in m/s times a factor 0.5. 

 

The amount of energy which the wind transfers to the rotor depends on the density of the air, the rotor area, and the wind speed.

Power Output

The table below shows the power output for certain wind speeds (*, **) in W/m².

* Power (P) in Watt / m² is calculated according to: P = ½ *1.225 kg/m³ *v³

** Air density of 1.225 kg/m³ at 15°C

m/s W/m²   m/s W/m²   m/s W/m²
0 0   8 313.6   16 2508.8
1 0.6   9 446.5   17 3009.2
2 4.9   10 612.5   18 3572.1
3 16.5   11 815.2   19 4201.1
4 39.2   12 1058.4   20 4900.0
5 76.6   13 1345.7   21 5672.4
6 132.2   14 1680.7   22 6521.9
7 210.1   15 2057.2   23 7452.3