Rotor blades consist of fi ber reinforced polyester or epoxy resin Rotational speed is particularly high in the area of the blade tips 70 80 m s 230 260 ft s The force multiplies when rain or worse yet hail hits them which causes the surfaces to be attacked This in turn increases friction drag that reduces the system s effi ciency Intrusion of water in the blades is even worse If lighting strikes which is not uncommon in such exposed high rise structures the water trapped in the blades can cause the overstretched outer skin to crack and burst Even if this should not occur the water deposits change the distribution of weight The resulting imbalances and vibrations stress the gearboxes and bearings which reduces the life of the entire system In an approach to solving this problem the Norwegian research organization SINTEF has successfully experimented with diverse nano particles such as carbon nano tubules and silicon dioxide particles to make coatings more resistant against the impact of precipitation Resisting the elements Energy for green hydrogen All the wind turbines whether standing on land fl oating on the sea or even fl ying through the air ways could supply huge amounts of green electric power Green electricity could charge all the bat tery electric vehicles or by means of electroly sis produce the coveted green hydrogen that may either be used in the steel and cement industry or be reconverted into electric power in fuel cells In this way wind power might lend wings to the plan et s decarbonization In any event wind as an en ergy source is available in abundance Experts tells us that 18 terawatts of installed capacity would be enough to cover the world s primary en ergy requirement the space available for this pur pose would suffi ce for generating 400 terrawatts Wind energy in mobility There are other industries besides the energy sector that can use the power of the wind and not necessarily just when converted into elec tricity Examples include sea trade and aviation Ocean going cargo ships haul about 90 percent of all the goods we consume from the aluminum foil we wrap our lunch in to industrial chemicals to tooth brushes Plus what used to work in the old days still works today sailing Reliable winds blow around the globe so more and more freighters are now putting to sea powered by the wind or at least using its force for assistance Some of them rely on special sails like the Dyna Rigg or kite rigs such as the SkySail The planned cargo vessel Ocean bird with a length of 200 meters 650 feet features fi ve wing sails each up to 80 meters 260 feet tall Due to using wind power the Oceanbird s carbon savings potential amounts to 90 percent Others rely on the more than 100 year old Flettner princi ple see also page 37 to save fuel Instead of sails 87 Outlook

Vorschau Schaeffler tomorrow 02-2020 EN Seite 87
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