Appunti sulle Energie Rinnovabili
Passive Solar Heaters
The Air#Maze™ Passive Solar Furnace is a Metal Maze Matrix of 25 Recycled Tin Cans "floating" in Space! The Tin Cans are mounted in an artistic array in a window box 20 inches square and 4.5 inches deep.
Also on that site: Airstick, to circulate air into a room, and other interesting stuff.
This is a simple one, with a nice "snake" idea:
A great panel, video:
http://www.youtube.com/watch?v=bRZvAAqzXIw a company selling them!!!
Corrugated cardboard panel!