Double skin glazed façades in sunny Mediterranean climates

• An unoccupied office building with West double gazed façade was monitored in summer.
• The temperature in the cavity exceeded in 10 °C the outdoor air at the sunset.
• Despite the high outdoor air temperatures, indoor ones do not exceeded the outdoor levels.
• Air speed in the cavity was 3.2 times lower than wind speed.
• Well-designed double glazed façades can reduce the cooling energy consumption.

Double skin glazed facades (DGF) are an actual worldwide trend in new and refurbished buildings, even in warm climates with high solar radiation levels as in the Middle East and in Mediterranean climates. In such climates, overheating of indoor spaces and therefore excessive energy consumption are the main problems to be faced. These issues are commonly addressed mostly by thermal simulation or experimental evaluations on small prototypes. However, measurements on real-scale buildings with DGFs are very unusual. This information is crucial to understand and validate the predictions of the thermal behavior of the DGF technology. In this paper, thermal measurements were carried out in an unoccupied office building with a West DGF placed in the Northwest region of Argentina during 3 months in spring/summer. The air temperature exceeded in 10 °C the outdoor air and that indoor temperatures have not exceeded the outdoor levels in the hottest hours. Two correct design decisions were the use of low-e double hermetic glazing and the addition of a screenpainting to the external DGF panel. The experimental data showed that well-designed DGFs can reduce the summer energy consumption of buildings, even using West DGFs, in sunny climates.