Four very interesting projects...
George Plhak Releases Generation 2 of His Concentrating Parabolic Reflector Solar Array
The Lucy Caliente Thermosyphon Solar Water Heater Plans and Construction Manual
Making Collector Fins from Recycled Printers Plates
Biomeiler -- Heat Extraction from Large Compost Piles
|The large ground wood compost pile in the making. Embedded tube spirals heat water.|