The diagrams illustrate the structure of solar panel and its appliance.
Looking from an overall perspective, it is readily apparent that the shown box, consisting of an inlet, an outlet and a transparent box on its surface, serves as a tool to heat air or water, getting energy from sun rays. Moreover, it is seen that structure as well as the process of heating either air or water are quite similar, except for a water pipe which is installed and used only to warm water.
Considering the air heating process, sun rays make the transparent top hot, while cool air goes through the inlet to the box, where sun power heats it. After that, already warm air goes out from the outlet. The water heating process is almost the same. However, the energy of sun rays warms not the transparent top, but the water pipe that connects the inlet and the outlet and in which the water is heated.
