## 3 Results
The same time-temperature relations were measured, analyzed, and evaluated for the 3 rd selected model day in October. The measured data for two different parts of the roof sheet and the ambient temperature are shown in Figure 8. From the presented dependencies, it is obvious that the roof sheet's downside part had almost the same temperature  
Figure 6: Time-temperature dependencies measured in different distances from the roof of model cowshed with installation of polycrystalline PV module and the ambient temperature. Figure 7: Time dependencies of polycrystalline photovoltaic module parts temperature, ambient temperature, and temperature between photovoltaic module and roof sheet. as the ambient temperature. On average, it is \(\pm\)25.1 \({}^{\circ}\)C. The aluminum roof sheet upside part had a higher average temperature of 28.3 \({}^{\circ}\)C.  
As in the previous case, the trend of graphical relations for ambient temperature and the temperature of model cowshed middle part was similar. From measured data, it was calculated that the average ambient temperature was 25.1 \({}^{\circ}\)C, and the average value of the temperature in the middle part of the model object was 25.4 \({}^{\circ}\)C. From the temperature point of view, the coldest was the upper part of the model cowshed, with an average temperature of 21.4 \({}^{\circ}\)C, and for the down part of the model cowshed, the average temperature was 23.1 \({}^{\circ}\)C (see Figure 9). Average temperature identified between the roof sheet and the monocrystalline photovoltaic module was 28.8 \({}^{\circ}\)C, which is 3.7 \({}^{\circ}\)C above the ambient temperature. The upside part of the photovoltaic module had an average temperature of 30.1 \({}^{\circ}\)C. The average temperature calculated for the downside part of the PV module was 46.1 \({}^{\circ}\)C (Figure 10). Figure 8: Time dependence of roof sheet temperature and ambient temperature for model cowshed with installation of monocrystalline PV module. Figure 9: Time-temperature dependencies measured in different distances from the roof of the model cowshed with installation of monocrystalline PV module and the ambient temperature. Measurements of the Temperature in the Real Coushed with and without Installed Photovoltaic Module on the Roof  
For validation of the obtained results, the same experiments were repeated in the real conditions. The measurements were performed in the cowshed, which is located in the farm situated in the southern region of Slovakia. There were measured temperatures on the two different animal production objects, which had the same azimuth orientation and the roof slope. The first building was without installation of the PV modules on the roof, and the second building had installed the PV modules on the roof. For data comparison, we selected days with similar weather conditions as in the previous experiments. Measurements were done in two model days in October. First, we performed measurements in the building without installation of the PV modules, and then we repeated the same experiments in the building with installed PV modules. The layout of the sensors was the same as in the model cowshed. The data identified by the measurements were numerically processed and then the average values of the temperatures were calculated, as presented in Figure 3:0 Ambient temperatures during measurements were very similar in average 23.6 \({}^{\circ}\)C and 23.7 \({}^{\circ}\)C.  
Graphical results of the temperature measurements in cowshed without photovoltaic modules on the roof are shown in Figure 3:1 From the trend of dependency, it is clear that temperature inside was the lowest. The average difference between the ambient temperature and the inside temperature value was about 0.5 \({}^{\circ}\)C. The roof sheets downside part had an average temperature of 31 \({}^{\circ}\)C.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Cowshed Roof**} & \multirow{2}{*}{\ \begin{tabular}{c} **Ambient** \\ **Temperature** \\ **(\({}^{\circ}\)C)** \\ \end{tabular}