SCIENCE IN THE NEWS DAILY
In Matters of Clever Design, Nature Has Often Got There First
from the Economist
Solar-power stations take up a lot of room. They need either vast arrays of photovoltaic panels, which convert sunlight directly into electricity, or of mirrors, which direct it towards a boiler, in order to raise steam and drive a generator. The space these arrays occupy could often be used for other purposes.
Two researchers from the Massachusetts Institute of Technology have now devised a better and more compact way of laying out arrays of mirrors. Slightly to their chagrin, however, and somehow appropriately, they found when they had done the calculations that sunflowers had got there first.
Alexander Mitsos and Corey Noone started with the observation that existing concentrated solar-power plants, as those which drive boilers are known, usually have their mirrors arranged in a way that resembles the seating in a cinema. The mirrors are placed in concentric semicircles facing a tower, on top of which the boiler and the turbine sit. That arrangement, however, sometimes results in the mirrors shading each other as the sun's position in the sky changes, even though the mirrors are usually attached to robotic arms that track the sun as it moves.
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