Nanometer molecular engineering is greatly applied
to improve the absorption capability, and increased the heat
collecting ability of the absorber coating by about 18%, so
the water temperature can be raised a lot. This unique carbonic
coating is more reliable than the traditional AL-N/AL coating,
and its ageing persistence is longer, and the coating property
Multi-layer magnetron sputtering aluminum-nitrogen/aluminum
highly selective absorption coating has improved the heat
collecting efficiency of the glass evacuated tube.
Evacuated tube is made of 3.3 high boron silicon glass
tube that complied with QB/T2436-99 (idt) ISO4803-1978
Standard, with high transmittance, well cold and thermal
shock resistance and strong optical stability.
Strictly conforms to the national standards GB/T17049-1997
starting from raw material to finished products.
All glass evacuated tubes are the key component
of the solar collectors. Each evacuated tube consists of two
glass tubes with vacuum in-between. The outer tube is made
of extremely strong transparent borosilicate glass that is
able to resist impact from hail up to 25mm in diameter. The
inner tube is also made of borosilicate glass, but is coated
with a special highly selective coating, which features excellent
solar heat absorption and minimal heat reflection properties.
The air is withdrawn (evacuated) from the space between the
two glass tubes to form a vacuum, which eliminates heat loss
from conduction and convection. Unlike other solar collectors,
evacuated glass tube solar collectors can still provide excellent
results on cloudy days because the tubes are able to absorb
energy from infrared rays, which can pass through clouds.
Wind and low temperatures also have less effect on the function
of evacuated tubes when compared to flat plate solar collectors
due to the insulating properties of the vacuum.