SOLAR WATER HEATER DOMESTIC SOLAR SYSTEM
We are blessed with Solar Energy in abundance at no cost. The solar radiation incident on the surface of the earth can be conveniently utilized for the benefit of human society. One of the popular devices that harness the solar energy is solar hot water system (SHWS). A solar water heater consists of a collector to collect solar energy and an insulated storage tank to store hot water.
Based on the collector system, solar water heaters can be of two types.
Flat Plate Collectors (FPC) based Solar Water Heaters
The solar radiation is absorbed by Flat Plate Collectors which consist of an insulated outer metallic box covered on the top with glass sheet. Inside there are blackened metallic absorber (selectively coated) sheets with built in channels or riser tubes to carry water. The absorber absorbs the solar radiation and transfers the heat to the flowing water. There are 60 BIS approved manufacturers of Solar Flat Plate Collectors.
Evacuated Tube Collectors (ETC) based Solar Water Heaters Evacuated
Tube Collector is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube.
VIRAAT Solar Water Heater (ETC System) works on a simple principle ‘Black body heat absorption principle’. The principle says, ‘black colour absorbs maximum heat, more than any other colour’.
These glass tubes are made of extremely strong borosilicate glass with special triple layer coating for excellent solar radiation absorption and minimal emission. Radiation capture is maximum due to 270o tracking.
The Domestic solar water heater generates hot water from sunlight which has the flow of liquid capacity to become heat in day time. And the water is stored in large volume of storage tank helps for the domestic purpose includes bathing, cleaning etc.