## 3 Results and Discussions  
### Temperatures Prediction  
Figures 9-12 present for the four periods of measurements and ventilation modes, the variations of the exterior air temperature, which also represents the air temperature at the entrance of the channel (T\({}_{\rm e}\)); the average temperature inside the DSF channel (T\({}_{\rm cav}\)); the temperature difference between the air inlet and outlet openings (DT); for the facade ventilated, respectively, the temperature difference between the air channel and the exterior for the closed facade (DT); the temperature in the interior room (T\({}_{\rm i}\)); and the solar radiation intensity (I\({}_{\rm t}\)). The air temperatures were calculated as the average of the values measured in different points inside the channel (T2\({}^{\star}\), T3\({}^{\star}\), T12\({}^{\star}\), T14\({}^{\star}\), T15\({}^{\star}\), T20\({}^{\star}\)), inlet section (T2, T23), and outlet section (T1, T19), Figure 5.  
The monitoring results show that for the first ventilation scenario (SET 1, Figure 9), the maximum air temperature (T\({}_{\rm cav}\)) inside the channel reaches 47.4 \({}^{\circ}\)C on the third day (13:00 p.m.) for an exterior temperature (T\({}_{\rm e}\)) of 37.6 \({}^{\circ}\)C and a solar radiation intensity (I\({}_{\rm t}\)) of 533 W/m\({}^{2}\), which is due to the greenhouse effect between the two layers of glass. The minimum value recorded inside the channel is 21.3 \({}^{\circ}\)C (6 th day, 5:00 a.m.) when the exterior one is 20.3 \({}^{\circ}\)C. It can be observed that daily, the two temperatures are almost equal between 06:00 p.m. and 6:00 a.m. and a maximum difference of about 10-13 \({}^{\circ}\)C is recorded around noon (10:00 a.m.-02:00 p.m.), depending on the day, when the DSF channel becomes \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Day**} & \multicolumn{3}{c}{**Outside Temperature (\({}^{\circ}\)C)**} & \multicolumn{1}{c}{**Average Wind Speed**} & \multicolumn{1}{c}{**Maximum Solar Radiation**} & \multicolumn{1}{c}{**Dominant Wind**} \\ \cline{2-6}  & **Mean** & **Low** & **High** & **(km/h)** & **(W/m\({}^{2}\))** & **Direction** \\ \hline
1 & 27.2 & 20.2 & 36.8 & 2.1 & 534 & N \\
2 & 21.1 & 16.8 & 27.0 & 4.2 & 633 & N \\
3 & 22.8 & 17.4 & 29.1 & 6.0 & 629 & N \\
4 & 25.3 & 18.6 & 31.2 & 4.0 & 547 & N \\
5 & 28.2 & 20.0 & 35.4 & 3.2 & 546 & N \\
6 & 29.6 & 20.9 & 36.4 & 1.6 & 552 & N \\
7 & 28.4 & 20.3 & 35.8 & 1.4 & 580 & N \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Climatic data recorded by the weather station—SET 3: 21 st-27 th July. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Day**} & \multicolumn{3}{c}{**Outside Temperature (\({}^{\circ}\)C)**} & \multicolumn{1}{c}{**Average Wind Speed**} & \multicolumn{1}{c}{**Maximum Solar Radiation**} & \multicolumn{1}{c}{**Dominant Wind**} \\ \cline{2-6}  & **Mean** & **Low** & **High** & **(km/h)** & **(W/m\({}^{2}\))** & **Direction** \\ \hline
1 & 28.7 & 22.1 & 35.1 & 2.3 & 557 & N \\
2 & 29.3 & 21.6 & 38.5 & 2.6 & 624 & N \\
3 & 22.5 & 18.6 & 26.3 & 4.2 & 601 & N \\
4 & 20.9 & 16.5 & 27.7 & 2.3 & 619 & N \\
5 & 20.2 & 15.6 & 25.7 & 1.3 & 700 & Noverheating. This justifies the introduction of Venetian blinds inside the channel to reduce the heating of interior room from solar radiation [9]. The average value of the air inside the channel, T\({}_{\text{cav}}\) for the entire period is 31.8 \({}^{\circ}\)C compared with the exterior one of 27.5 \({}^{\circ}\)C, for a wind speed of 1.6 km/h (N-NE direction). The average air relative humidity inside the channel has typical a value of 47%.