Solar Water Heating System (SWHS)
This device uses solar thermal energy for heating water.
(i) A flat plate collector
1) Water can be heated to a range of 60 C to 80 C.
2) SWHS of different capacities ranging from100 litres to 20,000 litres are available.
3) A SWHS of 100 litres per day LPD can save upto 1500 units of conventional electricity per year.
4) If maintained properly, a SWHS has a life span of 15 to 20 years.
(i)The flat plate collector is an insulated metallic black box covered with a glass sheet.
(ii)Water is allowed to pass through a maze of metallic tubing fitted inside the collector. The collector absorbs and retains solar energy, which is transferred to the water flowing inside the tube.
(iii) The heated water is collected in the insulated tank for domestic use.