## 3 Results and Discussions
### Temperatures Prediction
Results for the first three ventilation scenarios during the summer season are synthesized in Table 6.  
In the cold season in November (SET 4, Figure 12), the lateral and vertical openings are closed, and the channel facade behave like a thermal buffer. The aim was to recover the heat from inside the building and to valorize the greenhouse effect from solar radiation. Thus, it can be observed that the temperatures inside the DSF channel are more significant than the exterior ones with an average value of 2.2 \({}^{\circ}\)C for smaller solar radiation intensity of around 20 W/m\({}^{2}\) (8:00 a.m.-04:00 p.m.) in the first four days of the monitored period. On days 5 and 6, when the solar radiation intensity has maximum values around 12:00 a.m.  
Figure 12: Evolution of air temperatures and solar radiation intensity in the fourth period (24 th–30 th November), thermal buffer, closed channel. (144 W/m\({}^{2}\)), the temperature inside the channel reaches 21.1 \({}^{\circ}\)C for an exterior one of 6.6 \({}^{\circ}\)C. Also, in this period of a day, the temperature inside the DSF adjacent chamber, where no conditioning system is functioning, reaches a comfort zone of 20 \({}^{\circ}\)C. During the night, T\({}_{\text{cav}}\) records an average of 7 \({}^{\circ}\)C for an exterior one of 5 \({}^{\circ}\)C, and the temperature inside the interior room is around 16 \({}^{\circ}\)C. During the cold season, the time shift between the glass and cavity temperature is less than one hour, because of the small thermal mass available. In this particular case of no ventilation, the channel's humidity plays an essential role because of the condensation risk. Thus, the average recorded value of the relative air humidity recorded in the DSF channel was 80%, with a maximum of 94.9%, Figure 13. It can be seen that the humidity has more significant values during the night and morning when the temperatures are lowered, favoring the appearance of condensation on the DSF surfaces inside the channel, Figure 14.  
Figures 15-18 present for the four periods of measurements and ventilation modes, the variations of the exterior air temperature (T\({}_{\text{e}}\)), the surface temperature of the outer glass (T\({}_{\text{s,e}}\)), the average temperature inside the DSF channel (T\({}_{\text{cav}}\)), the surface temperature of the inner glass towards the air channel (T\({}_{\text{s,i,e}}\)) and towards the interior chamber (T\({}_{\text{s,i,i}}\)), the temperature in the interior room (T\({}_{\text{i}}\)), and the solar radiation intensity (I\({}_{\text{t}}\)). The surface temperatures averaged over the height of the channel on the outer glass at six points (T4*, \begin{table}
\begin{tabular}{c c c} \hline \hline  & **SET 1** & **SET 2** & **SET 3** \\  & **07 th–13 th July** & **14 th–20 th July** & **21 th–27 th July** \\ \hline T\({}_{\text{cav}}\) max (\({}^{\circ}\)C) & 47.4 (3 rd day, 01:00 p.m.) & 47.7 (2 nd day, 01:00 p.m.) & 44.8 (6 th day, 01:00 p.m.) \\ T\({}_{\text{e}}\) (\({}^{\circ}\)C) & 37.6 (3 rd day, 01:00 p.m.) & 36.8 (2 nd day, 01:00 p.m.) & 34.9 (6 th day, 01:00 p.m.) \\ I\({}_{\text{t}}\) (W/m\({}^{2}\)) & 533 (3 rd day, 01:00 p.m.) & 540 (2 nd day, 01:00 p.m.) & 545 (6 th day, 01:00 p.m.) \\ T\({}_{\text{cav}}\) min (\({}^{\circ}\)C) & 21.3 (6 th day, 5:00 a.m.) & 16.8 (6 th day, 05:00 a.m.) & 18.5 (5 rd day, 06:00 a.m.) \\ DT\({}_{\text{10}}\)0.00m.\({}_{\text{14}}\)400p.m. (\({}^{\circ}\)C) & 10–13 & 11–12 & 7–10 \\ T\({}_{\text{cav}}\) average (\({}^{\circ}\)C) & 31.8 & 29.0 & 29.1 \\ T\({}_{\text{e}}\) average (\({}^{\circ}\)C) & 27.5 & 24.9 & 26.1 \\ V\({}_{\text{wind}}\) average (km/h) & 1.6 (N-NE) & 2.2 (N) & 3.2 (N-SSE) \\ \%RH\({}_{\text{average}}\) & 47\% & 48.3\% & 47.8\% \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Synthesized results of the ventilation scenarios during the summer season. Figure 13: Evolution of air temperatures and relative humidity in the fourth period of cold season.