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EVACUATED TUBE COLLECTOR BASED SOLAR WATER HEATER
In this system the 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. The flowing hot water is then collected in the storage tank.
These systems are less expensive and can work efficiently in hilly regions and also in regions where water quality is not very good.
The life of the system may, however, be less than that of FPC system as their collectors are made of glass.
These systems are available in any size e.g. 50, 75, 100, 125, 150 LPD etc.
Presently these systems do not have BIS Standards, though they have approval of Ministry of New and Renewable Energy, GOI.