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E. Bajraktari, J. Lechleitner, A. Mahdavi:
"Prediction of the Sound Insulation of Double Lead Facades with Openings for Natural Ventilation";
Vortrag: BSA2015 - Building Simulation Applications 2015 - 2nd IBPSA-Italy Conference, Bozen, Italien; 04.02.2015 - 06.02.2015; in: "Building Simulation Applications 2015 - 2nd IBPSA-Italy Conference", IBPSA Italy (Hrg.); Free University of Bozen - Bolzano, 2nd IBPSA Italy Conference (2015), Paper-Nr. 115, 7 S.

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This paper explores the reliability of acoustical simulation for the prediciton of the sound insulation of double leaf facades with openings for natural ventilation. The subject of the study is an experimental modular double-leaf wall with multiple opening possibilities. Different elements can be opened in both (i.e. internal and external) layers, such that multiple opening configurations can be studied both empirically and computationally. The actual acoustical performance of the wall was captured through parametric laboratory measurements. The respective configurations were then modelled using a state-of-the-art room acoustics simulation program. Thereby, alternative representations of the double leaf facade were explicitely modelled in terms of two seperate entities with the facade cavity as an interstitial space. In other representations, the sound transmission through the wall and the acoustical coupling between openings on the two layers were modelled as seperate processes. The initial acoustical model was calibrated by comparing the measured and the simulated reverbation times in the laboratoryÄs two chambers. Specifically, the calibration involved the adjustements of the absorption properties of the laboratory chambers such that an improved match between the measured and simulated reverberation times could be achieved. Computer simulation and laboratory measurement results pertaining to the sound insulation of the experimental wall were compared for multiple opening configurations. The results illustrate the potential as well as the considerable limitations of acoustical performance simulation toward prediction og the sound insulation of double-leaf wall systems. Likely reasons for this circumstance as well as potential improvements are discussed.

https://www.unibz.it/en/sciencetechnology/events/bsa2015/abstract/default.html