## 2 Materials and Methods
### Implemented Passive Cooling Techniques  
In the experimental campaign carried out, four passive cooling techniques were applied in cell C1, individually (Phase I) and in three different combinations (Phase II). Cell  
Figure 4: Equipment used: (**A**) Temperature sensor; (**B**) CO\({}_{2}\) concentration meter; (**C**) Black globe thermometer; (**D**) INMET Meteorological Station.  
C2 was kept unchanged, so that it could serve as a control in evaluating the effectiveness of each technique. Campaigns 1 to 4 were part of Phase I and campaigns 5 to 7 were part of Phase II.  
In campaign 1, the shading of the glazed opening was implemented through a shutter-type aluminum frame (0.8 \(\times\) 0.8 m\({}^{2}\)), painted with white paint and fixed on the window of cell C1 (Figure 5A). In campaign 2, a low-emissivity reflective film was applied between the OSB ceiling and the thermo-acoustic tile covering of cell C1 (Figure 5B). In campaign 3, natural cross ventilation was ensured, due to the effect of the wind. For this purpose, two openings were made in cell C1, measuring 20 cm \(\times\) 20 cm each, one of them being located in the lower part of the east facade and the other in the upper part of the west facade, to guarantee their orientation to the prevailing winds (Figure 5C). In campaign 4, white reflective paint was applied on the outer faces of the four walls and on the roof. The application was carried out with three coats, according to the manufacturer's instructions (Figure 5D).  
Campaign 5 consisted of the simultaneous application of reflective paint on the opaque envelope of cell C1 and cross ventilation by the action of the wind, which was guaranteed 24 h a day. Campaign 6 was similar to campaign 5, although natural cross ventilation by wind action only occurred at night (between 18 h and 8 h). There was a 7 th campaign, in which, associated with painting the opaque envelope with reflective paint, there was natural ventilation 24 h a day by the chimney effect, with three openings of 20 cm \(\times\) 20 cm each, two located at the bottom of cell C1, on the west and east walls, and the third on the cell ceiling in its central part (Figure 5E). During all tests, the cell door and window remained closed, guaranteeing natural ventilation to occur only through the openings. The measurements (Phase I and Phase II) lasted 11 months, between June and April, according to the schedule presented in Table 2.  
\begin{table}
\begin{tabular}{c l c} \hline \hline
**Campaign** & **Passive Cooling Techniques** & **Duration** \\ \hline \multicolumn{3}{c}{**Phase I**} \\
1 & Shading of the glazed opening & 21 days \\
2 & Application of low-emissivity reflective film in the attic & 21 days \\
3 & Natural cross ventilation by wind action for 24 h & 21 days \\
4 & Painting the opaque envelope with reflective paint & 28 days \\ \hline \hline \end{tabular}
\end{table}
Table 2: Measurement schedule.  
Figure 5: Implemented passive cooling techniques: (**A**) Shading of the glazed openings; (**B**) Low-emissivity reflective film; (**C**) Natural cross ventilation, due to wind effect; (**D**) Painting with reflective paint on the walls and roof; (**E**) Natural ventilation, by chimney effect.