Solar water heaters are designed to harness the solar energy to heat the water for residential and commercial use.
Parts of solar water heater
The solar water heater comprises of two parts viz., solar collector (which absorbs sun radiations & transfer the heat to water) and a storage tank, which stores the water heated by the solar collector.
Flat Plate collectors
Flat Plate Collector also referred as FPC, which is usually a flat insulated box covered with the glass and a bunch of tubes , usually of copper. This tube is covered & welded to the wide fins,usually of Aluminium painted with high absorption coatings such as TINOX.
The collectors are placed on the rooftop facing the south in northern hemisphere and north in southern hemisphere.The solar collector turns the sun’s radiation into heat which is then transferred on the the water inside these tubes.
The heated water is transferred to the storage tank either through the pumps, which is controlled by the solar controller or if the tank is placed on the top of the collectors then through thermosiphon (hot is lighter thus rises, cold is denser, heavier thus settles down).
In case of non sunny days or fluctuation in hot water demand, The Rheem solar water heater is backed up by auxiliary heating at the outlet end which will heat the water only when the sun’s radiation is not enough to heat the water upto the desired degrees.. These backup heaters could either be of gas, electric, heat pump etc. It is always recommended to install a thermostatic mixture in the solar water heater so as to prevent scalding if the temperature of the water rises exceptionally.
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