Can the mounting of small wind turbines directly on roof structures be effective?

Where does the wind industry stand on installing wind turbine units on the roofs of high-rise buildings, condos and residential units? And have there been any projects completed to date that would show it’s a profitable venture? Terry F, Ontario – Canada

At the moment, small wind systems near buildings seem to have a larger market penetration. One of the new entrants to the small wind market is Edinburgh-based Renewable Devices Ltd, maker of the Swift rooftop wind energy system. The ‘slow’ turning five-blade rotor, has an unusual patented ring diffuser, which the company claims minimizes noise. Swift, of Scotland, has installed some model turbines on UK rooftops such as rooftop turbines installed at each of five Fife Primary schools in their 2005 pilot, as well as in Malawi and Japan. Mike Bergey, President of Bergey Windpower Co. of Norman, OK states, “The plain facts are that roofs weren’t designed for wind turbines and the wind over roofs is hard on a wind turbine. It’s the hardest and worst place to put a wind turbine”. Southwest Windpower (Flagstaff, AZ) Vice President Andy Kruse was more sanguine, “There are conditions where a roof top mounted wind generator can work. However, like solar, an improperly mounted wind generator can be worthless or worse, cause damage to the roof. A wind generator must always be mounted on the upwind side of the structure and if at all possible more than 10′ above the roof. Structural engineering must be completed on any building where a wind generator above 1kw is installed.” Since we have cellular towers and HVAC units on roofs, undoubtedly wind systems will migrate there too – but challenges relating to roof structure, noise, and building codes – all pose impediments for fast market penetration. – Scott Sklar
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Scott, founder and president of The Stella Group, Ltd., in Washington, DC, is the Chair of the Steering Committee of the Sustainable Energy Coalition and serves on the Business Council for Sustainable Energy, and The Solar Foundation. The Stella Group, Ltd., a strategic marketing and policy firm for clean distributed energy users and companies using renewable energy, energy efficiency and storage. Sklar is an Adjunct Professor at The George Washington University teaching two unique interdisciplinary courses on sustainable energy, and is an Affiliated Professor of CATIE, the graduate university based in Costa Rica. . On June 19, 2014, Scott Sklar was awarded the prestigious The Charles Greely Abbot Award by the American Solar Energy Society (ASES) and on April 26, 2014 was awarded the Green Patriot Award by George Mason University in Virginia.

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