The diagrams give the information about the solar panel’s structure and usage. It is clear that the solar panel has two main parts and is used for two specific purposes, which generating hot air and hot water.
A transparent Top is place on a rectangle box which has a pair of pipes locating at the opposite sides of its, and they are called Inlet and Outlet respectively. When the solar panel is in charge of heating the air, a sun creates energy which goes directly through the transparent top. The cool Air is go through the Inlet and then be heated by the sun Rays. As the result, the air becomes warm and goes out the Outlet.
If the Solar Panel is used to heat water, the water pipe will be added inside the box to form the way for the water flow. When the cool water is go through the pipe, it is heated by the sun rays and turning to the warm water, which come out of the Outlet.