Hub heights of up to 200 meters 650 feet can also be achieved with this natural material Wood is even suitable as a material for foundations and rotor blades In spite of these advantages wood has not been able to crack the dominant position of steel and concrete with large scale wind power systems because these materials are established in the marketplace at high levels of vertical integration The 1 5 megawatt system from German manufacturer Timber Tower that was commissioned near Hanover in 2012 has so far remained a pilot project in spite of announcements that it would be followed by others In Sweden Modvion an engineering and industrial design company commissioned an initial prototype using prefabricated glued laminated timber modules in April 2020 The fi rst projects with heights of up to 150 meters 490 feet are planned to be implemented for Swedish energy corporations starting in 2022 Modvion expects that wooden wind energy towers cannot just be constructed in more climate friendly but also in clearly more cost effi cient ways than those of steel Wood is a work in progress but still waiting to achieve its breakthrough in the wind energy sector Before wind power systems can provide renewable electricity they generate a negative climate footprint The installation of the huge masts and foundations of concrete and steel results in 2 000 and more metric tons 2 200 short tons of climate gas emissions depending on the size of the systems Due to the utilization of wood which binds CO2 during the growth stage notably one metric ton per cubic meter 63 lb per cubic foot wind power systems can be established in climate neutral ways Plus wood as a material off ers other advantages The modular design and the material reduce the weight of the towers The composition of the modules does not presuppose any special quality of the access routes because the modules are assembled on site which eliminates the need for heavy haulage A wooden tower has longer fatigue life and is not prone to corrosion Wooden systems are much easier to dismantle and dispose of than systems of concrete and steel Appropriate combustion of end of life system components will not cause any additional environmental burden and the energy can be used sensibly Wood meets wind Diverse ideas of wood Modvion in Sweden above uses prefab self supporting formed modules At Timber Tower right in Germany a wooden structure also featuring a modular design initially grew tall and was subsequently reduced in size 84

Vorschau Schaeffler tomorrow 02-2020 EN Seite 84
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