*3.2. Analysis of the Prototype. "Peltier" Device ON*

Figure 12 shows the interior temperature of both cabins and the exterior temperature from 22 July 2018 to 27 July 2018. The "Peltier" cell was in operation according to a simple control logic based on the interior temperature programmed in the monitoring control unit. It was set to operate every summer day from 12:30 to 20:00. The goal was to keep the inlet temperature between 15 and 17 ◦C to test the indoor air conditions inside the WFG cabin. The mean maximum temperature reached inside the WFG cabin (*Tw\_air*) was 26.5 ◦C, with a mean maximum solar radiation of 720 W/m2. However, the mean maximum temperature of the Reference cabin (*Tr\_air*) exceeds 37 ◦C, when the mean maximum outdoor temperature (*T\_ext1*) is 34.5 ◦C. Therefore, there were more than 10 ◦C of difference inside both cabins. The Reference glazing replicated the thermal oscillations of the outside temperature, generating discomfort inside the building and contributing to overheating. The same behavior was observed when analyzing the minimum temperatures. The minimum value of *T\_ext1* was 10 ◦C, while the Reference cabin remained at 12 ◦C, and the WFG cabin reached 15 ◦C. Therefore, the thermal inertia that characterizes the WFG facade managed to dampen the oscillation of the interior temperature. The temperature oscillations of the Reference cabin were similar to the outside temperature. Hence, the WFG cabin allowed for the bringing of the maximum and minimum values close to the comfort temperature. Specifically, analyzing 23 July 2018, the mean value between the maximum *Tw\_air* daytime temperature (26.5 ◦C) and the mean minimum value of night time temperature (16.5 ◦C) was 21.5 ◦C, which was very close to the comfort temperature.

**Figure 12.** Indoor temperature of both cabins (*Tr\_air*, *Tw\_air*), the outdoor temperature (*T\_ext1*), and solar radiation from 22 July 2018 to 27 July 2018.
