The heart of the solar thermal system is the evacuated tube solar collectors set up in neat rows on a frame. Unique product inside the tubes captures ultraviolet energy and transforms it to heat. The heat is drawn away from the tubes by way of a thermal transfer liquid and then made use of to heat water for direct use or for area heating.
http://solarpowerenergyplans.com/collecting-solar-energy-even-when-its-cloudy/
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