## 3 Results  
The results are divided into five parts, according to the experimental set up. Measurements of the Temperature in the Model Cowshed Interior and Exterior without Installed Photovoltaic Module on the Roof  
The example of measurement results for the 1 st selected model day in October. The simulation was performed without a photovoltaic module on the model roof. Average ambient temperature in the mentioned time range was 24.2 \({}^{\circ}\)C. The upside part of the aluminum roof sheet had an average temperature of 30.4 \({}^{\circ}\)C, and downside part, 32.4 \({}^{\circ}\)C (Figure 3). The time-temperature dependencies for different parts of model cowshed without PV modules are presented on Figure 4. From the presented results, it is evident that the upper part of the model cowshed was the coldest with an average temperature of 21.5 \({}^{\circ}\)C. The middle part of the object had an average temperature of 26.5 \({}^{\circ}\)C, and down part of the model cowshed had an average temperature of 23.6 \({}^{\circ}\)C. \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Group of the Sensors**} & **Distance from the Roof** & **Distance from the Wall A** \\  & **(mm)** & **(mm)** \\ \hline S1 & 80 & 30 \\ S2 & 400 & 30 \\ S3 & 80 & 330 \\ S4 & 400 & 330 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Temperature sensor distances. Figure 3: Time dependencies of roof sheet temperature and ambient temperature for model cowshed without installation of PV module. Measurements of the Temperature in the Model Cowshed Interior and Exterior with Installed Polycrystalline Photovoltaic Module on the Roof  
In the frame of this measurement, the polycrystalline photovoltaic module SPP50-10/3a was installed on the model cowshed roof. Because aluminum roofing has corrugation, the distance between the roofing and photovoltaic module was 20 mm (minimum) and 40 mm (maximum). The temperature sensor was installed in a distance of 20 mm from the roof. The results obtained from the 2 nd selected model day in October were evaluated and processed. Time temperature dependence (Figure 5) showed the course for sheet upside, downside, and ambient temperature. Ambient temperature and temperature of aluminum roof sheet downside was very similar, on average \(\pm\)24.5 \({}^{\circ}\)C. The average temperature 26.8 \({}^{\circ}\)C was experimentally detected on the upside roof sheet surface. The graphical relations on Figure 6 present experimentally obtained time-temperature dependencies. From the dependencies, it is obvious that the smallest difference was identified between the temperature in the middle part of the model cowshed and the ambient temperature, and the average difference was 0.9 \({}^{\circ}\)C. The upper part of the model  
Figure 4: Time-temperature dependencies measured in different distances from the roof of model cowshed without installation of PV module and the ambient temperature. Figure 5: Time dependencies of roof sheet temperature and ambient temperature for model cowshed with installation of polycrystalline PV module. cowshed was the coldest, with an average temperature of 20.9 \({}^{\circ}\)C. The down part had an average temperature of 22.6 \({}^{\circ}\)C.  
Trend of the temperature changes between the aluminum roof sheet and polycrystalline photovoltaic module is presented on the Figure 7. The temperature between roof and photovoltaic module was on average 27.2 \({}^{\circ}\)C, 2.6 \({}^{\circ}\)C above the ambient temperature. The average temperature of the polycrystalline photovoltaic module upside was 36.7 \({}^{\circ}\)C. The downside part of the photovoltaic module was hotter, with an average temperature of 41.9 \({}^{\circ}\)C.  
Measurements of the Temperature in the Model Cowshed Exterior and Interior with Installed Monocrystalline Photovoltaic Module on the Roof  
The experimental set up was the same as in the previous experiments, but the monocrystalline photovoltaic module SZ-50-36M was installed on the roof of model cowshed.