Windcatchers represent an ancient technology still used today in parts of the Middle East and other dry regions of the world. Windcatchers are designed to create natural dwelling ventilation and, when used with water pads, a natural cooling effect. It consists of a tower that rises above the dwelling, with an opening that catches the passing wind. The wind is carried down into the dwelling, providing a refreshing breeze to push out stagnant hot air. When pads dampened with water are used to line the tower, the moving dry air evaporates the moisture, which causes a drop in air temperature and increased density. The heavy cool air shoots down the tower and through the dwelling, enhancing the ventilation and cooling.
Today, this time-tested concept is being used in an entirely different way, providing a new highly-efficient source of clean plentiful energy. Solar Wind Energy, a Maryland-based renewable energy company, has developed what is called a solar wind downdraft tower. Their proprietary tower, currently in the final stages of patenting, is uniquely designed to capture the power of both sun and moving air.
As with a windcatcher, the wind is captured by the tower, but then the air’s motion is greatly increased by tapping the solar generated heat energy carried in the air. As water is introduced to the dry air within the confines of the tower structure, it immediately evaporates, creating a massive downdraft with the cool dense air plummeting downward at speeds that can exceed 50 miles per hour. At the base, the energy from all that moving air is quickly captured, while the water is recycled for continued use. The net result, after all factors are considered, is calculated to be approximately 400-500 megawatt hours, depending upon conditions, available for sale to the grid.
For information on Solar Wind Energy visit www.cleanwindenergytower.com
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