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Abstract:	Historische Kastenfenster stehen noch immer in Verwendung, werden aber seit den 1980er Jahren vermehrt durch sogenannte Thermofenster aus Holz, Metall oder Kunststoff ersetzt. Als Hauptargument für den Fenstertausch wird neben der Haltbarkeit der Oberflächenbeschichtung vor allem der hohe Wärmedurchgang bei Kastenfenstern ins Treffen geführt. Dabei werden aber für diese historischen Fenster nicht Messergebnisse am realen Bestand, sondern normativ festgelegte Default-Werte herangezogen. Diese Default-Werte betragen allerdings das Drei- bis Vierfache der Laborwerte der industriell gefertigten Thermofenster. Um den tatsächlichen Wärmedurchgang bei Kastenfenstern bestimmen zu können, wurde an der Höheren Technischen Bundeslehranstalt (HTBLA) in Hallstatt/Oberösterreich die Entwicklung eines Messverfahrens in Angriff genommen, das an Ort und Stelle am realen Objekt einsetzbar ist. Die erste Messreihe legt den Schluss nahe, dass der reale Wärmedurchgang bei Kastenfenstern deutlich niedriger liegt, als die Default-Werte vorgeben. Thermal conductivity of box-type windows - an in-situ evaluation concept for historical buildings. Historic box-type windows are still in use, but are, starting with the 1980ies, increasingly replaced by insulating glass windows made from wood, metal, or plastic. Primary argument for a window change is the durability of the surface coating and the high heat loss with box-type windows. Historic windows are thereby not evaluated with real, experimental values, but are characterized by default-values. These values are three to four times as high as the heat transfer values of modern insulating glass windows measured in the laboratory. In order to determine the real heat transfer values of box-type windows, a measuring system is developed at the Higher Technical College in Hallstatt, which can be applied in-situ the real object. First results suggest that the real heat transfer through box-type windows is significantly lower than assumed.
Source:	Bauphysik 39 (2017), No. 2
Page/s:	144-147
Language of Publication:	German

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