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Solar Water
Heater using all Glass evacuated Tubes:
Description:
All glass evacuated tubes are the key component of solar collectors. The
evacuated tube is similar to a conventional Dewar flask and consists of two
borosilicate glass tubes, a glass with high chemical and thermal shock
resistance. The outer side of the inner tube is coated with a sputtered solar
selective surface. This coated inner tube is closed at one end and sealed at the
other end to the outer tube. The annular space between the outer tube and inner
tube is evacuated to virtually eliminate heat loss by conduction and convection.
Himin successfully developed the
innovative Advanced Solar Selective Coatings in commercial scale, which achieve
the highest thermal efficiency and good thermal stability. Solar selective
coatings absorb most solar radiation while simultaneously suppressing the
thermal emittance loss from coating surfaces. They vary mainly in their optical
property and thermal stability.
Excellent results have been
obtained by using DC magnetron sputtering technology. A solar absorptance of
0.94 - 0.96 with an emittance of 0.04 - 0.06 at 100 oC has been achiev
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