How does the Solar Collector work?
The sun-ray pass through the transparent glass and strike on the black surface of the absorber. The black coating on the absorber converts the radiation energy of sun-rays into heat. This heat is conducted to the tubes by fin which is made of copper or high conductivity material. The tubes carry water which receives heat from the tube and becomes hot. To reduce the heat losses and thereby increase the efficiency of the solar collector, thermal insulation is provided at the back of the absorber.
The glass covers serves two main purpose. It reduces the effect of wind and heat losses, and protects the black coating on the absorber from the effects of weather, rain etc.