Siła wiatru z lądu
Challenges in wind power supply
Pressure and negative feedback from the big audience is often significant, especially in coastline wind tower installations. Additionally, there is a strong need to find new geographical territories and favourable locations for new wind farms, especially inland.
To date, it has not been possible to produce wind power inland in a cost-efficient manner with existing steel tubular towers.
Reaching better wind conditions
According to several inland wind measurement surveys, wind speed increases by at least 0.5 m/s when measured at a height of 120 metres compared to 80 metres. On the basis of wind condition measurements for a period of 12 months in a Swedish inland forest, energy output increases by 40-50% when the hub height increases from 100 metres to 140 metres. A wind speed increase of 0.5 m/s means an increase in power output of 25%.
Wind shear when increasing hub height, typical inland wind shear curve
© 2003 Soren Krohn & Danish
Wind Industry Association
Energy efficiency inland, increase of wind energy in German locations for hub heights from 100 m to 160 m
Rising
energy % |
 |
|
Hub height m |
Source: SeeBA
Comparison of different wind towers
|
Tubular Steel Tower Hub height only 100 m |
Ruukki Wind tower (lattice tower) Hub height 140 m |
Hybrid tower (steel tube/concrete) Hub height 140 m |
| Tower section steel/tons |
270 |
277 |
150 |
| Foundation reinforcement steel/tons |
48 |
41 |
84 |
| Tower section reinforcement steel/tons |
Not needed |
Not needed |
186 |
| Total steel/tons |
318 |
318 |
420 |
| Tower section concrete/m3 |
No concrete |
No concrete |
780 |
| Foundation concrete/m3 |
379 |
300 |
640 |
| Total concrete/m3 |
379 |
300 |
1420 |
Comparison is based on 2.5 MW turbines.
For the tubular steel tower, all values are based on a hub height of 100 m.