Comportamiento acústico de la fachada ventilada con revestimiento ligero. Análisis de la variación según las características de la ventilación

• Autores: Andrea Niampira Daza
• Localización: Revista de acústica, ISSN-e 0210-3680, Vol. 46, Nº. 3-4, 2015, págs. 43-44
• Idioma: español
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• Resumen

  • This thesis examines the sound insulation qualities of façade buildings with barrier protection against exterior airborne noise. This research is focused specifically on the acoustic performance of Lightweight Ventilated Façades (LVFs) with exterior claddings. The properties LVFs are an important line of research because they are now commonly used in new buildings, and because many buildings from twentieth century, especially those built before the 70s, in Spain and other Euro Zone countries require renovation to the exterior walls for aesthetic reasons, for better insulation and to meet new low energy consumption requirements.

    In Spain, the current «Código Técnico de la Edificación» (CTE) regulation does not allow for the consideration of exterior cladding with an air cavity to a pre-existing façade when meeting airborne sound reduction requirements.

    However there is evidence that applying an exterior cladding with an air cavity can improve the overall airborne sound insulation in a façade, with respect to the pre-existence wide and heavy wall. The level of reduction is dependent on the inner characteristics of the air cavity how thickness, the addition of an acoustic absorber material and the opening ventilated surface in the air cavity in the LVF.

    To establish these results, analytic computer simulation modelling methods have been used, along with laboratory and on-site acoustic testing using a real pre-existence façade wall and another enclosing walls to measure the sound reduction behavior in double walls after augmentation of the ventilation slits: Varying its opening surface and the position and direction of the slits in a LVF, ascertained the relevance to use some of these different variables in the sound reduction and acoustic performance of LVF in each method carried out.

    This work hopes to contribute to the development of future regulation regarding airborne sound insulation façade improvement using (LVFs) for building renovation.