Detailed Product Description
A
Split Solar Water Heater is composed of: Solar Thermal
Collectors (evacuated
tube or flat plate) which absorbs solar radiation (sunlight) and
changes it into heat;
Solar Water
Tank (Storage hot water tank) accumulates the hot
water produced by solar energy so that it can be stored for use
when needed;
Frame (bracket)
which support the Solar Collectors and Solar
Tank;
Accessories which ensure
the regulation and the safety of the system;
Back-up
heater (gas, oil, or
wood fuelled boiler, electric immersion heater or heat pump) which
will bring the hot water to the temperature required when there is
not enough sunlight to do so (mostly in winter).
In
most area, solar thermal collectors alone cannot provide all the
hot water for a household's needs throughout the year. Correctly
sized they will supply 60% of heat / domestic hot water needs. They
are normally installed in conjunction with a conventional back-up
heating system.
Circulating
pump (only apply in
active solar water heating) which
transfers the heat from the solar thermal collectors to hot water
in a solar tank;
Closed-Loop Active Systems
These systems pump heat-transfer fluids
(usually a glycol-water antifreeze mixture) through the solar water
heater. Heat exchangers transfer the heat from the fluid to the
water that is stored in tanks. Double-walled heat exchangers or
twin coil solar tanks prevent contamination of household water.
Some standards require double walls when the heat-transfer fluid is
anything other than household water. Closed-loop glycol systems are
popular in areas subject to extended subzero temperatures because
they offer good freeze protection. However, glycol antifreeze
systems are more expensive to purchase and install and the glycol
must be checked each year and changed every few years, depending on
glycol quality and system temperatures.
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