13 Jan 2012:
More Efficient Solar Design
Draws Inspiration from a Sunflower
Finding inspiration in the structure of a sunflower, a group of scientists has designed a concentrated solar power plant (CSP) that will require 20 percent less land than existing plants
while increasing the
amount of sunlight its solar mirrors are able to collect. At the sprawling CSP plants already in use worldwide, hundreds of mirrors are arranged around a central tower, concentrating sunlight on the tower to heat water and generate electricity. But the current designs, in which the mirrors are staggered, create unnecessary amounts of shadowing and blocking of sunlight, according to a team of scientists at the Massachusetts Institute of Technology and RWTH Aachen University in Germany. Their new design, which is described in the journal Solar Energy
, instead arranges the mirrors at angles of about 137 degrees to each other, similar to the florets of a sunflower, a pattern that increases total efficiency. “If we’re talking about going to 100 percent or even 10 percent renewables, we will need huge areas,” said Alexander Mitsos, an MIT researcher. “So we better use them efficiently.”
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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.
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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.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. 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.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.