Kastenfenster-Optimierung im historischen Bestand

Energy performance optimization of historic box-type windows.

It is well known that the energy and CO₂ savings in the building sector play a key role in meeting the Kyoto Protocol and climate change targets. While plus energy levels are already being reached in the residential and office building sectors, all optimizations and improvements in museums were limited only to the building services sector until recently. The constantly increasing use of technology-based air conditioning in comparison with conventional "passive" climate concepts do not result in the expected significant improvements in historical buildings, but an enormous increase in the operating costs of building services. In the study presented here, various measures to reduce transmission and ventilation heat losses, as well as the reduction of summer heat gains through windows were carried out and their effect evaluated on a real object (Neue Burg in Vienna). It has been shown that by relatively simple measures the thermal performance of historic box-type windows can be improved by at least 25 %.