Solar Heating Panels

1. Collector
When sun’s rays fall on a solar water heater collector, made up of either an Evacuated Vacuum Tube System or Flat Plate Collector System, the radiation heats up the water present in the glass tubes (in EVT) and metal tubes (in FPC) due to high transmittance of the covering glass medium.
2. Tubes
The heated water is less dense, so it rises in the various tubes eventually reaching the tank at the top. The relatively colder and denser water in the tank descends into the tubes, in turn getting heated — this cycle continues. The Thermosiphon effect ensures the movement of hot water upwards into the tank because of difference in density, eliminating the need for an external pump.