Montpellier school of architecture (ENSAM) - Double window - Impact on the whole window - Uw < 1.5 W/m²K

All existing curtain walls and windows were replaced with new double-glazed units equipped with an integrated solar protection system. The selected glazing technology was developed by a French start-up called Immoblade, which specializes in the development of innovative "low-tech" products. The company created a double-glazed solution that incorporates fixed and tilted miniature sunshade blades within the argon-filled gap between the two glass layers. These blades are angled strategically to optimize solar heat gain in winter while minimizing it in summer. The specific angle is determined algorithmically and varies based on the building's geographical location and the solar orientation of the façade. These aluminium blades are 12.4 mm wide and less than 1 mm thick. They are interconnected by steel cables and supported by an upper suspension profile and a lower tension profile. Furthermore, to enhance thermal insulation, a low emissivity layer has been placed on the internal face of the glazing. These glazings are integrated either into fixed or opening sashes.

Given the original building's significant amount of glazed areas, improving thermal and energy performance required intervention on all curtain walls and windows. Located in the South of France, in a region with abundant sunlight, one of the main focuses was to improve summer thermal comfort. The Immoblade innovative glazings, featuring a solar protection system, have been incorporated into all curtain walls and windows that face south, west, or east. However, more "traditional" double-glazed units have been installed on the north façades of the building. From an architectural standpoint, this solution enhances the thermal and energy efficiency of the curtain walls without the need for intrusive sunshade elements that could disrupt the appearance of the original façade. Through the replacement of all glass components, the project also aimed at expanding the glazed surfaces to highlight the concrete structural elements, making them visible from outdoor spaces. Regarding air circulation, the interstitial spaces of the framework are designed to enable natural ventilation, particularly to facilitate night-time overventilation.