Solar water heating system is a device that uses solar energy to heat water for domestic, commercial, and industrial needs. Heating of water is the most common application of solar energy in the world. A typical solar water heating system can save up to 1500 units of electricity every year, for every 100 litres per day of solar water heating capacity.
2.Working of a solar water heater
A typical domestic solar water heater consists of a hot water storage tank and one or more flat plate collectors.
The collectors are glazed on the sun facing side to allow solar radiation to come in.
A black absorbing surface (absorber) inside the flat plate collectors absorbs solar radiation and transfers the energy to water flowing through it.
Heated water is collected in the tank which is insulated to prevent heat loss.
Circulation of water from the tank through the collectors and back to the tank continues automatically due to density difference between hot and cold water (thermosyphon effect).
