SOLAR WATER HEATER ACCESSORY: SOLAR VACUUM TUBE Solar vacuum
tube is the core parts of solar water heater. It absorbs solar
energy converting it into heat for hot water heating. Solar vacuum
tubes have already been used more than 20 years in China. Each
solar evacuated tube consists of two glass tubes made from
extremely strong borosilicate glass. The outer tube is transparent
allowing light rays to pass through with minimal reflection. The
inner tube is coated with a special selective coating which
features excellent solar radiation absorption and minimal
reflection properties. The top of the two tubes are fused together
and the air contained in the space between the two layers of glass
is pumped out while exposing the tube to high temperatures. This
"evacuation" of the gasses forms a vacuum, which is an important
factor in the performance of the evacuated tubes.Why a vacuum? As
you would know if you have used a glass lined thermos flask, a
vacuum is an excellent insulator. This is important because once
the evacuated tube absorbs the radiation from the sun and converts
it to heat, we don't want to lose it!! The vacuum helps to achieve
this. The insulation properties are so good that while the inside
of the tube may be 150oC / 304oF , the outer tube is cold to touch.
This means that evacuated tube water heaters can perform well even
in cold weather when flat plate collectors perform poorly due to
heat loss Specification:For more infomation, please feel free
to contact us ! /* March 10, 2023 17:59:20
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