13 Jul 2011:
Analysis Suggests Ways to
Dramatically Increase Wind Farm Output
A new analysis by the California Institute of Technology (Caltech) finds that the power output of wind farms can be increased tenfold
— and with fewer environmental impacts — through better positioning of vertical-axis turbines. Because the large turbines used in most modern wind farms are placed far apart to prevent aerodynamic interference, much of the potential wind energy that enters the farms is wasted, according to the paper, published in the Journal of Renewable and Sustainable Energy
. And the common steps taken to compensate for that problem, including construction of bigger blades or taller towers, generate higher costs and greater environmental impacts. Using a test array of vertical-axis wind turbines on a Southern California field, the Caltech researchers showed that more strategic placement of turbines closer to the ground maximizes energy production. The vertical-axis turbines can be placed closer together without causing aerodynamic interference, and researchers found that having each turbine spin in the opposite direction of its closest neighbor increased efficiency, perhaps because the opposing spins decreased the drag on each turbine, allowing them to spin faster.
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A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.