SOLAR FLAT PLATE SYSTEM (FPC)
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.
SOLAR EVACUATED TUBE SYSTEM (ETC)
The selective coating on the inner cover of the evacuated tubes absorbs the heat. When the temperature rises, the density of water drops and weight goes down, hot water will go up to exchange with cold water in the tank. In the way, the temperature of the water in the tank goes up. ETC technology is suitable for domestic non-pressurised hot water application.