The objective of this project is to evaluate a solar installation that is used to cool the air that is taking it from the outside of the same building that the installation is located. We can see better that the system it's made for two main parts, the first one is used to catch the solar energy that is coming from the sun and this energy is used to heat the air. This air is led through of pipes from the roof of the building till the air cool system. This is the second part of the installation the air cool system. This part of the system is taking, natural air from outside and is led through pipes till a filter, in this filter the particle that the air contains are cached with this filter. The next step we can say that is in the rotor, in this part the air that is coming for the filter and the hot air that is coming from the solar installation are passing through the rotor and the hot air is used to dry the air from the filter. We can say that the energy that is take it from the sun is used to heat the air and this energy in form of warm is used to get dry the air. So we can see more or less that this is the process explained in general concept. This project consist in to evaluate this installation and calculate the efficiency energetic, so first of all we can start to talk about the solar energy and the main applications for this technology. So we will make in the first part of the project a theoretical part and we will describe the kinds of solar energies and the comparison between the solar energy in Poland and Spain, some parameters that are important to define the installations, the law as concerning to the solar installations, etc..