7mon
The Family Handyman on MSNHow Does a DIY Solar Water Heater Work?Passive systems rely on the thermosyphon ... professionally installed collectors and less-expensive DIY-friendly solar hot ...
Another technique uses moveable mirrors to focus the sun's rays on a collector ... solar technologies are passive. For example, big windows placed on the sunny side of a building allow sunlight to ...
13d
Interesting Engineering on MSNChina’s solar-heated sand floors keep homes cozy at 65°F even in freezing -1°FScientists in China have revolutionized heating with a solar-air heat pump and sand-based thermal storage floor.
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