The understanding of problematics about energy consumption in all aspects of our life is rising. Therefore, the tehnology related to energy efficiency is getting improved each day. One of the most effective way to save energy is to upgrade buildings and houses with instalation of recuperators and to use indirect adiabatic cooling. That is also the main topic of this thesis, where experimented methods of calculating thermal efficiency of recuperator with and without adiabatic cooling will be presented. Therefore, the necessary measurements of the air currents, the temperature and humidity conditions of outlet and inlet air will be performed. Measurements were made for IMP Climate installed in the LOSK laboratory. The final thermal efficiency results show that the efficiency of the measured recuperator is up to 58 % without, and up to 55 % with the use of adiabatic cooling, depending on boundary conditions. However, by comparing the recuperator using evaporative cooling with the one that does not, it was found that with evaporative cooling we can achieve greater temperature differences, but the thermal efficiency itself is lower due to the different calculation methodology.
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