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Who is
Solar Direct?
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The team at Solar Direct designs and supplies
state-of-the-art solar water heating systems that
deliver major energy savings, resulting in
substantially lower water heating costs and major
cuts in green house emissions. |
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What are the Key Benefits of our system? |
Some of the many benefits our Solar solutions deliver
include:
Up to 80% of your water heating needs sourced
directly from the Sun Solar Rays.
Up to 60% more efficient in frost prone areas.
A proven Solar technology - widely used throughout the
world.
High quality Solar products backed by generous warranties.
Amongst the lowest greenhouse emissions of any
system in the market.
At Solar Direct you the Solar System pay for itself in 2-3 years.
Easier to install - a range of frames exist to suit
installation on all roof types and pitches.
Maintenance free.
Naturally frost protected - perfect for cold
climates.
Can be retro-fitted to existing electric or natural
gas storage geysers. |
How the Evacuated Tube Works?
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Vacuum tube
Evacuated tubes are the absorber of the solar water
heater. They absorb solar energy converting it into
heat for use in water heating. Each 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 (Al-N/Al) 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. The vacuum in the evacuated glass
tube is less than 5×10-3pa This can only be reached
and maintained over a long period of time through a
specialised evacuation process in production
resulting in an almost total elimination of
convection and conduction losses from the tube. |
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