large diameter 125mm solar vacuum tube for solar cookerEach 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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