Hiya all,
Here Down Under they're going to build a massive solar tower. A big greenhouse will heat up air, it'll flow up through a chimney, drive turbines and generate electricity.
I was wondering if anyone had ever tried anything similar on their vents. Here in Australia, it often gets quite hot, and houses have chimney vents, tall tubes, often with sieve-like windmills on 'em. Couldn't we chuck a small turbine on that? Wouldn't produce much power, but if nothing else it could power a ceiling fan in the house!