Turbines: a powerhouse at sea
Once the DanTysk wind farm is completed, 80 wind turbines spread out over an area of 70 square kilometres will be using their vast rotor blades to turn the powerful North Sea wind into green energy. Each of these units, built by Siemens, stand at a maximum overall height of 148 metres above the water surface and deliver an output of 3.6 megawatts. They can produce a total of 1.3 billion kilowatt hours of electricity per year; that's the equivalent of CO2-free energy for up to 400,000 houses, based on an energy usage of 3,500 kilowatt hours per year. The curvature of the earth means that the rotor blades cannot be seen from the mainland, even in perfect weather conditions.
The nacelle itself is roughly the size of a bus and houses the most essential components, such as the motor, the generator and the automatic control system which makes sure the rotor is positioned correctly in relation to the wind.
The 'Pacific Osprey' is needed to transport and assemble the wind turbines; it will set sail from the project's central port in the Danish town of Esbjerg for the offshore construction site – with up to twelve turbines on board per trip.
- Rotor diameter: 120 metres
- Hub height: 88 metres
- Capacity: 3.6 MW
- Nacelle weight without rotor and hub: approx. 150 tonnes
- Nacelle weight with rotor and hub: approx. 250 tonnes
- Tower: approx. 210 tonnes
- Rotation speed: Rotor: 5-13 RPM
- Cut-in wind speed: 3-4 metres/second
(=wind strength 2-3)
- Nominal wind speed: approx. 12 metres/second
(=wind strength 6)
- Cut-out wind speed: 25 metres/second
(=wind strength 10)
- Tip speed: just under 300 km/h