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Abstract:	Auf dem Freilandversuchsgelände des Fraunhofer-Instituts für Bauphysik (IBP) in Holzkirchen wurde das Feuchte- und Wärmeverhalten verschiedener Wandaufbauten aus Holz (geschlitzte Holzkonstruktion, Massivholzkonstruktion, Dämmsteinkonstruktion, Holzplattenkonstruktion, Brettstapelkonstruktion) über die Dauer eines Jahres getestet. Folgende Größen wurden gemessen: Innenraumklima, Außen- und Innenoberflächentemperaturen sowie die Temperaturen an den Grenzschichten, die Wärmestromdichte auf der Innenseite der Bauteile, die relative Luftfeuchte sowie die Holzfeuchte. Das Ziel der Arbeit war einerseits, die verschiedenen Aufbauten unter realen Bedingungen zu vergleichen, andererseits wurden die ermittelten Messdaten für Validierungsberechnungen mittels der Simulationssoftware WUFI®Pro und Delphin verwendet. Die gemessenen, instationären U-Werte stimmen in den Wintermonaten mit den stationär bestimmten Werten gut überein. Bei den Simulationsberechnungen ergeben sich deutlich bessere Ergebnisse, wenn die an der ETH Zürich gemessenen deutlich tieferen Wärmeleitfähigkeiten für Holz anstelle der Normwerte in die Simulation eingesetzt werden. Obwohl bei vier Bauelementen keine Hinterlüftung der Holzfassade bestand, wurden keine kritischen Werte bezüglich der relativen Luftfeuchte innerhalb jener Wandkonstruktionen gemessen. Bei der Simulation der relativen Luftfeuchten zeigten beide Programme teilweise starke Abweichungen gegenüber den gemessenen Werten. Comparative measurements of heat and moisture transfer in different wood-based building elements. At the campus of the Fraunhofer Institute for Building Physics (IBP) in Holzkirchen/Germany comparative measurements of heat and moisture transfer in five different wood-based building elements were carried out (wood construction with slotted wood elements, solid wood construction connected with wooden dowels, new developed soft fibreboard brick construction, solid wood panel construction, wood frame construction with stacked wood elements). The elements were installed on the west side of the test building and examined during one year. The following physical quantities were measured: indoor climate, external and internal surface temperatures, temperatures in the boundary layers, heat flux through the internal surface of the constructions, relative humidity and moisture content. Furthermore, the measured data were used for validation of the simulation softwares WUFI®Pro and Delphin. During winter, the measured U-values (from unsteady-state values) were compared with steady-state calculated U-values. Both values were well coincident. Moreover, the simulation results achieved good agreement by using the thermal conductivity values measured at ETH Zurich, which were considerably lower than the standard values. Although, the four elements had been covered with a non rear-ventilated façade, no critical values of relative humidity were measured inside the constructions. The simulation results of relative humidity have partly shown large deviations from measured data by both simulation softwares.
Source:	Bauphysik 33 (2011), No. 5
Page/s:	287-298
Language of Publication:	German

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