The figures reflects the main features of a solar panel and how they are organized according to their usage. Overall, the diagrams show the internal structuring of solar panels and how each part is functioning to convert cool air or water into hot air or water step by step.
Firstly, a box is covered up with a layer made up of a transparent material, which helps in capturing amd trapping sunlight. The rectangular box consists of two passages one for entrance and other for exit.
The second figure illustrates heating of cool air using such solar panel. Air with low temperature enters the box through one of the passages. The sunlight captured in the box makes this air warmer.
On the other hand, the last figure depicts the process of warming cold water. However in such types of panels, another feature is introduced to make way for water which is connected with the inlet and outlet at both ends. When cold water is introduced into the panel, the heat energy from sunrays rise the temperature.