## 3 Results and Discussions
### Temperatures Prediction
T9*, T10*, T11*, T13*, T19), on the inner glass at nine points (T1*, T5*, T6, T6*, T7, T7*, T8*, T16*, T17*), and on the surface of the inner glass inside the chamber at nine points (T3, T4, T8, T9, T10, T15, T18, T20, T24), Figure 5.  
The first scenario of natural ventilation with lateral openings (SET 1) is presented in Figure 15. During the day, the surface temperatures are highly correlated with solar radiation. The surface temperature of the DSF channel side of the exterior glazing (T\({}_{\rm s,e}\)) is lower than the air inside the channel (T\({}_{\rm cav}\)) and more significant than the exterior (T\({}_{\rm e}\)) one between 08:00 a.m. and 16:00 p.m. and almost the same during the night with an average difference of 1.2 \({}^{\circ}\)C. This tendency can also be observed in Figure 16, which presents the thermal distribution during the 7 th day of the first scenario. Both interior surfaces T\({}_{\rm s,e}\) and  
Figure 16: Temporal distribution of the surface temperatures during the first period for the seventh day (13 th July). Figure 14: Condensation phenomena inside the DSF channel (**a**) exterior glazing—view from inside the channel, (**b**) interior glazing—view from inside the interior room. Figure 15: Evolution of surface temperatures and solar radiation intensity in the first period (07 th–13 th July), outdoor air curtain, natural ventilation. T\({}_{\rm s,i,e}\) have almost equal temperatures. The air inside the channel (T\({}_{\rm cav}\) = 41.2 \({}^{\circ}\)C) becomes warmer than the exterior glazing (T\({}_{\rm s,e}\) = 30.9 \({}^{\circ}\)C) during the high values of solar radiation between 08:00 a.m. and 16:00 p.m. with a maximum difference of 10.3 \({}^{\circ}\)C in the seventh day (11:00 p.m.) for an exterior temperature (T\({}_{\rm e}\)) of 25.8 \({}^{\circ}\)C and a solar radiation intensity (I\({}_{\rm t}\)) of 504 W/m\({}^{2}\). An average value for the entire period of 29.3 \({}^{\circ}\)C is recorded for both glazing surfaces inside the channel (T\({}_{\rm s,e}\) and T\({}_{\rm s,i,e}\)), situated between the air temperature inside the channel, T\({}_{\rm cav}\) of 31.4 \({}^{\circ}\)C and the exterior one of 28.0 \({}^{\circ}\)C. Because of the low interior double glazing U-factor, the interior surface temperature (T\({}_{\rm s,i,i}\)) is lower with 2 \({}^{\circ}\)C, tempering the indirect solar gains. During the second measurement period (SET 2, Figure 17), the forced ventilation does not change the variation tendency of surfaces temperatures inside DSF. The average difference between the surface temperatures and the air inside the channel is 2.8 \({}^{\circ}\)C higher for the last one, compared with the first scenario of 2.5 \({}^{\circ}\)C. This is because the temperature on the glass surface inside the room is lower than the room air and depends on direct solar radiation. The maximum recorded difference of 11.3 \({}^{\circ}\)C between the interior surfaces T\({}_{\rm s,e}\) and T\({}_{\rm s,i,e}\) inside the DSF channel and the air inside was recorded during the day at 11:00 a.m., when the air inside the DSF channel heats up due to the greenhouse effect. An average value for the entire period of 26.3 \({}^{\circ}\)C is recorded for T\({}_{\rm s,e}\) and T\({}_{\rm s,i,e}\), relative to the air channel, T\({}_{\rm cav}\) of 29.0 \({}^{\circ}\)C, and the exterior one of 24.9 \({}^{\circ}\)C.  
In the third ventilation scenario (SET 3, Figure 18) of summer conditions, a maximum difference of 7.3 \({}^{\circ}\)C of the air channel is reached relative to the exterior glazing on the fourth day of measurements at 12:00 p.m., smaller than in the first two monitoring periods. The temperatures of the glass surfaces are higher relative to the ones of the exterior air  
Figure 17: Evolution of surface temperatures and solar radiation intensity in the second period (14 th–20 th July), outdoor air curtain, forced ventilation. Figure 18: Evolution of surface temperatures and solar radiation intensity in the third period (21 st–27 th July), outdoor air curtain, natural ventilation.