Maglev - União entre o Eólico e o Magnético
Magnetic levitation is an extremely efficient system for wind energy. Here’s how it works: the vertically oriented blades of the wind turbine are suspended in the air above the base of the machine, replacing the need for ball bearings. The turbine uses “full-permanent” magnets, not electromagnets — therefore, it does not require electricty to run. The full-permanent magnet system employs neodymium (”rare earth”) magnets and there is no energy loss through friction. This also helps reduce maintenance costs and increases the lifespan of the generator.
Maglev wind turbines have several advantages over conventional wind turbines. For instance, they’re able to use winds with starting speeds as low as 1.5 meters per second (m/s). Also, they could operate in winds exceeding 40 m/s. Currently, the largest conventional wind turbines in the world produce only five megawatts of power. However, one large maglev wind turbine could generate one gigawatt of clean power, enough to supply energy to 750,000 homes. It would also increase generation capacity by 20% over conventional wind turbines and decrease operational costs by 50%. If that isn’t enough, the maglev wind turbines will be operational for about 500 years!
Construction began on the world’s largest production site for maglev wind turbines in central China on November 5, 2007. Zhongke Hengyuan Energy Technology has invested 400 million yuan in building this facility, which will produce maglev wind turbines with capacities ranging from 400 to 5,000 Watts. In the US, Arizona-based MagLev Wind Turbine Technologies will be manufacturing these turbines. Headed by long-time renewable energy researcher Ed Mazur, the company claims that it will be able to deliver clean power for less than one cent per kilowatt hour with this new technology. It also points out that building a single giant maglev wind turbine would reduce construction and maintenance costs and require much less land than hundreds of conventional turbines. The estimated cost of building this colossal structure is $53 million.
Quiet Revolution Ltd has revolutionized the windmill with their new QuietRevolution wind turbine, the QR5. Not only is it one of the most visually appealing wind turbines available on the market, its small scale allows it to fit seamlessly into an urban environment, providing a renewable energy resource in places where space constraints previously made it impossible to hook up green power systems.
The genius of the QuietRevolution’s QR5 is its VAWT design, aka Vertical Axis Wind Turbine. The VAWT enables the QR5 to gather power from the winds near around buildings that are constantly changing directions. It is also quieter than your typical wind turbine because the tip speed is slower, due to the triple-helix design, which in turn allows it to be situated closer to buildings and on towers.
Exactly how big is the QuietRevolution Turbine you ask? Currently in production, the QR5 is 5m high and 3.1m in diameter. Two more sizes are currently being developed, the OR2.5 (2.5m x 2.5m) and the QR12 (12m x 6m). The QR5 is currently priced at £25,000, which includes the purchase of the wind turbine, integrated control electronics, peak power tracking, auto shutdown and generator. Depending on placement and wind speeds, the QR5 will pay for itself within 15 years or less.
The creative thinkers at QuietRevolution have taken the wind turbine one step further with their QuietRevolution Display. Through the use of LEDS and a unique firing sequence coordinated with the spinning of the blades, a full color video image can be displayed as if it is hanging in the middle of space.
Veja o vídeo no site: Quiet Revolution Wind Turbine
Fonte: www.inhabitat.com
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