Hinterlüftung und Tauwasserausfall bei Verbundfenstern - Experimentelle Labor- und Freilanduntersuchungen zu Hinterlüftung und Tauwasserausfall im Fensterzwischenraum eines Verbundfensters

Ventilation and condensation water failure in coupled windows - Experimental laboratory- and outdoor measurement about the ventilation and the condensation water failure in den window interspace of a coupled window.

Coupled windows are always used when increased physical construction requirements are placed on the sound and heat protection in winter. This is achieved through the double skin window structure, with the additional benefit that a sunblind can be placed in the window space between the outer and inner window sash [1].
In practical use, condensation water occurs on different glazing types. This condensation water occurs especially on the inside of the outer glazing (Fig. 1, pos. 2) where it is least wanted. In the course of detailed studies on a coupled window of the WICONA brand, this transient condensation water occurrence is scientifically evaluated based on laboratory and field measurements.
The monitoring program for the experimental determination of the condensation water occurrence is elaborated on the basis of a construction methodological model. For this purpose, the coupled window is divided into its elementary components and the material and energy flows accounted for. Through the combined approach of building physics and thermodynamics probes can be attached preferably to the surfaces where there is potential risk for condensation water occurrence.
The metrological investigations show that the ventilation and the risk of condensation water on pos. 2 can be influenced mainly by placing opening sections at the base and head of the coupled window. Trough small opening cross sections, very little condensation water shall form on pos. 2. An increased air exchange between the window interspace and the environment can be detected with larger aperture cross-sections, which also increases the occurrence of condensation water.