Our
Evacuated Tube Solar Collectors convert direct and diffused
solar radiation into heat. Infra red rays, which can pass
through clouds, are also absorbed and converted into usable
heat. The collectors efficiently collect and transfer this
energy through a special collector plate and a rapid heat
transfer channel ‘the heat-pipe’,
situated in an evacuated glass tube, to a highly insulated
manifold heat exchanger. The collector plate has a
special wavelength ‘selective’ coating using a
semi-conductor layer. This special absorber plate converts
the
maximum amount of solar radiatio into heat whilst having
very low radiation losses. The heat-pipe has a very low
heat capacity but an exceptionally rapid conductivity and
therefore is a very efficient and speedy heat conductor. It
also provides the system with a diode function i.e. heat
transfer is always in one direction - from the absorber to
the water and never the reverse. Due to the physical
properties of the ‘heatpipe’ fluid and the
special construction of the condenser, the maximum working
temperature of the system can be controlled. This unique
feature eliminates the need for complicated controls and
ensures safety in the
system. The special fluid inside the
‘heat-pipe’ evaporates when heated,
transferring heat energy to its top.The vapour condenses
inside a special heat exchanger (which is located within a
water manifold) and the fluid then returns to its original
position, at the bottom of the ‘heat-pipe’, due
to gravity and the cycle is repeated continuously. The
vacuum in the glass tube, being the best possible
insulation for a solar collector, suppresses heat losses
and also protects the absorber plate and the
‘heat-pipe’ from external adverse conditions.
This results in exceptional performance far superior to any
other type of solar collector.