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Large glass coil, shaped like a tightly wound spring spiraling upwards. Air inside is heated, and thus rises, shooting out the top & sucking air in the bottom. At the top is a turbine to create electricity.
For a small one I'm thinking maybe a 1m diameter tube, mabe about 3-5 meters high, but they
could be any size really. Placed in the desert these suckers would get mighty hot.
Google also Solar Chimney Manzanares Spain [kbecker, Oct 04 2004, last modified Oct 21 2004]
||Solar chimneys are in the oven. See Mountainside Solar Chimneys in the list above.
||Unless the glass coil adds a special twist this is baked (link).
||[kbecker]Yeah, the twist is that it doesn't have to be twice the height of the Empire State Building (see link)