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Generator in der Luft hat doppelt so hohe Leistung

 

Doch Ingenieure in aller Welt basteln längst an Alternativen zu herkömmlichen Windrädern: Sie träumen von fliegenden Windkraftwerken. Forscher am renommierten Massachusetts Institute of Technology (MIT) im US-amerikanischen Cambridge etwa wollen Windräder mithilfe einer mit Helium gefüllten Hülle bis zu 600 Meter über der Erde schweben lassen.

In dieser Höhe ist die Windausbeute fünf- bis achtmal höher als am Boden, heißt es bei der MIT-Ausgründung Altaeros Energies, die das Konzept vermarkten soll.

Der hoch in der Luft schwebende Generator mit dem Namen Buoyant Airborne Turbine (BAT) erreiche eine doppelt so hohe Leistung wie ein vergleichbarer, auf einem Turm montierter Generator, der eine Leistung von rund 2,5 Megawatt liefert.

Das Windrad selbst hat einen Durchmesser von 3,7 Metern. Es steckt in einer 15 Meter langen und 15 Meter breiten aufblasbaren Röhre, die mit Helium gefüllt wird.

Der Fluggenerator wird mithilfe mehrerer Seile fixiert, ĂĽber ein Kabel gelangt der erzeugte Strom zur Erde. Das gesamte Equipment eines BAT soll in einen Schiffscontainer passen.

Den Forschern zufolge ist das Windrad innerhalb von 24 Stunden aufgebaut und startklar.

Dann könne es auch in abgelegenen Gegenden oder in von Katastrophen heimgesuchten Regionen zum Einsatz kommen, in denen die Stromversorgung zusammengebrochen ist.

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Altaeros Energies is developing turbine-equipped tubular helium balloons that float up to 2,000 feet in the air to capture wind energy. (From Altaeros Energies)

By Nancy Szokan September 29-2014

Think of it as a Goodyear blimp for the era of alternative power. Well, sort of. What Erik Sofge describes in the October issue of Popular Sciencemagazine is a kind of giant tubular helium balloon with a three-bladed turbine inside, floating as much as 2,000 feet in the air so it can capture energy from winds that blow stronger and more steadily than they do at ground level.

It’s the BAT, for buoyant airborne turbine, a robotic airship being developed by Altaeros Energies, a company founded in 2010 at the Massachusetts Institute of Technology. The system is designed to deliver energy to a ground station via one of the cables that would tether the balloon to Earth.

Besides reducing one of the big problems with earthbound wind power — that the electric grid, designed for continuous transmission, doesn’t work well with fickle winds — the BAT is supposed to be mobile: It could be inflated, tethered to a ground station built on a trailer platform, then deflated and moved. “We have a vision of putting out a product that you could deploy, leave there for a year or two, pack down and move to a new site or a new customer,” says Adam Rein, lead director of Altaeros.

Altaeros has already tested a prototype 500 feet above a site in Maine. With the aid of a $740,000 grant from the Alaska Energy Authority — which is interested in power sources for the state’s many communities that are off the electrical grid — Altaeros is working on a commercial BAT that will house a 30-kilowatt turbine, which could power about a dozen homes. Later versions, Rein said, would be 200-kilowatt models, big enough to compete with generators that typically power remote mines and construction sites. “We’re not trying to replace wind turbines,” Rein says. “We’re trying to expand wind energy to places where it doesn’t work today.â€

The magazine points out that Altaeros has competitors for the high-altitude business: Companies are developing giant airfoils, kites and planes, functioning at anywhere from 400 to 8,000 feet in the air, hoping to have something in production within the next couple of years.ť

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