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Author(s):	Friedrich, Matthias; Schweers, Klaus; Wellershoff, Frank
Title:
Abstract:	Doppelfassaden verbessern den Schallschutz bei natürlicher Fassadenlüftung und bieten der Verschattung im Fassadenzwischenraum (FZR) einen Schutz vor hohen Windlasten. Bezüglich der natürlichen Lüftung ist jedoch zu beachten, dass die Luftströmungen zwei Fassadenebenen passieren müssen und die Luftwechselzahl nicht mit den Annahmen für einschalige Fassaden geplant werden kann. Die potenziell höheren Temperaturen im Fassadenzwischenraum erfordern zudem eine besondere Beachtung bei der Planung des sommerlichen Wärmeschutzes. An zehn Gebäuden in Hamburg mit Korridor-Doppelfassaden und Kastenfenster-Doppelfassaden wurden Klimadaten erfasst und Luftwechselmessungen vorgenommen. Anhand dieser Daten wurde ein Berechnungsansatz des Außenluftwechsels erstellt und in transienten thermischen Gebäudesimulationen angewandt. Erstellt wurde eine Methode, mit der in frühen Planungsphasen schnell und ohne Softwareanwendung die erforderliche Größe der Lüftungsöffnungen bestimmt werden kann. Pre-dimensioning of ventilation openings in double façades Double façades improve sound insulation while natural ventilation and offer the shading in the space between the façades, protection from higher wind loads. With regard to natural ventilation, however, it should be noted that the air flows must pass through two façade layers and the air exchange rate cannot be planned with the existing assumptions for single-skin façades. The potentially higher temperatures in the intermediate façades space also require special consideration when planning summer heat protection. Climate data were recorded, and air exchange measurements were taken on 10 buildings in Hamburg with corridor double façades and box window double façades. Based on these data, a calculation approach of the outdoor air exchange was created and applied in transient thermal building simulations. A method was created with which the required size of the ventilation openings can be determined quickly and without software application in early design phases.
Source:	Bauphysik 44 (2022), No. 4
Page/s:	187-202
Language of Publication:	German

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