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FLAT PLATE COLLECTOR BASED SOLAR WATER HEATER
In this system 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 it are blackened metallic absorber (selectively coated) sheets with built in channels or riser tubes to carry water. The absorber sheets absorb the solar radiation and transfer the heat to the flowing water. The flowing hot water is then collected in the storage tank.
These systems have long life (15-
20 Years) and work efficiently especially in non- hilly regions and regions where water quality is good. For other regions Heat- exchangers are required.
These systems are available in multiple of 100 LPD (Liters per day) i.e. 100, 200, 300 LPD etc.
Bureau of Indian Standards has standardized the collectors for this type of Solar Water Heaters IS 12933: 2003 gives the details of these standards.