New developments in multifunctional IGUs

Dr.-Ing. Frank Schneider and Oliver M. Hübler, OKALUX GmbH

Today, the demands on Insulating Glass Units (IGUs) become progressively complex and manifold. Even, contradictional functions, i.e. solar protection and use of natural daylight have to be realized at the same time to fulfil the increasing requirements of the
worldwide energy standards. Therefore, the physical properties of the IGU have to be improved to fit to the boundary conditions.

Usually, the insulating capacity of an IGU is enhanced by gas-filling of its cavity. In combination with lowemissivity coatings U = 1,1 W/(m²K) for double glazing and U = 0,6 W/(m²K) for a triple glazing IGUs can by achieved. Translucent NANOGEL fillings provide new possibilities. These Silica-based Aerogel consists up to 97% of air, but
prevents convection and conduction due to its nanostructure. Thus, a cavity with NANOGEL-filling behaves like an evacuated volume and reaches U= 0,3 W/(m²K) and less. Like capillaryinlays, the light is scattered and brought deep into the room.

Another development is the future trend to intelligent facades. Different companies are working on variable tintable coatings, based on thermo- or electrochromatics. These dynamic systems may once react adaptive to the changing environment and offer new
possibilities for planers and engineers. The future will bring a evolution from “transparent holes in a opaque wall” to multifunctional facades.

Full-text article [267 KB]

The Authors

Dr. Frank Schneider Research and Development Director OKALUX GmbH 1993 – 1999 • Studies: Darmstadt University of Technology, Darmstadt, Germany • Title of qualification awarded: Diploma in Civil Engineering 2000 – 2005 • Name and address of employer: Darmstad... Read more