Micro-optical components for daylight utilisation and sun protection allow a significant improvement in energy efficiency, life cycle assessment and occupant comfort in buildings. For some time now, researchers in the network have been working on ways to integrate them into the building envelope. In a previous research project, they had developed a light-directing structure for vertical façades that directs daylight deep into areas far from the façade without causing glare. This can now be produced in dimensions that are suitable for building applications.
In the TaHo project, this structure has now been integrated into composite pane systems and tested in two demonstration buildings. A new type of reflector ceiling, optimised in advance in laboratories, supports the glare-free light direction. Energy efficiency and user acceptance were evaluated in a monitoring project. The researchers also compiled technical data and planning aids to support a subsequent market launch.
Another key architectural application in daylight utilisation is the natural lighting of buildings via skylights and horizontal glazing. New micro-optical structures were developed for this in a second part of the TaHo project. These were intended to be comparable with the structure for vertical façades in terms of efficiency and possible mass production. A key task was to optimise the ratio of daylight entry and solar shading and to ensure a high level of visual comfort by reducing glare.
Fraunhofer IBP is now presenting the results of the research project at glasstec 2024, where a demonstrator will be on display showing the advantages of a light-directing element made of micro-optical components in comparison with conventional windows and blinds.
