Estimating the Sound Insulation of Double Facades with Openings for Natural Ventilation
Estimating the Sound Insulation of Double Facades with Openings for Natural Ventilation
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DOI：
10.1016/j.egypro.2015.11.129
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
Egzon Bajraktari;J. Lechleitner;A. Mahdavi
中科院分区：
文献类型：
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作者：
Egzon Bajraktari;J. Lechleitner;A. Mahdavi
自然通风是一种潜在的可持续方案，可为建筑物提供良好的室内空气质量和自由冷却。然而，由于室外气候条件、空气污染或噪音污染，其应用经常受到阻碍。后一个障碍是本文研究背后的主要动机之一，因为噪声暴露下的建筑物无法有效地部署自然（窗户）通风选项。为了解决这个问题，建筑围护结构解决方案的潜力，可以提供足够的隔音，同时促进自然通风是至关重要的。具体来说，目前的贡献集中在双层外立面的自然通风开口的隔音性能。因此，一个通用的双叶立面的构思和安装在两个相邻的混响室之间的声学实验室的建筑物理和建筑生态学系在维也纳大学的技术。这种实验性的模块化双叶墙允许开放元素的各种配置。研究了多种开口组合，使得各种系统参数（例如，开口的尺寸、开口的位置、两层中开口的相对位移）可以通过经验和计算来评估。此外，考虑并测试了双壁空腔（用吸声板实现）中的各种吸声水平。由此产生的一套全面的参数配置是系统的声音传输测量的主题。利用测量结果，多变量分析和曲线拟合技术被部署到开发基于几何的方程，用于预测具有自然通风开口的双叶立面的隔音效果。此外，提出了一个简单的分析模型，也可以应用于预测这种结构的声音传输。基于几何和分析模型的结果与测量结果进行比较，讨论其预测性能的潜力和局限性。
Natural ventilation represents a potentially sustainable scheme for the provision of good indoor air quality and free cooling in buildings. However, its application is frequently hindered due to outdoor climatic conditions, air pollution, or noise pollution. The later impediment represents one of the main motivations behind the research presented in this paper, as buildings under noise exposure cannot effectively deploy the natural (window) ventilation option. To address this problem, the potential of building envelope solutions that could offer sufficient sound insulation while facilitating natural ventilation is of critical importance. Specifically, the present contribution focuses on the sound insulation properties of double facades with openings for natural ventilation. Thereby, a generic double-leaf façade was conceived and installed between two adjacent reverberant chambers in the acoustic laboratory of the Department of Building Physics and Building Ecology at the Vienna University of Technology. This experimental modular double-leaf wall allows for various configurations of open elements. Multiple opening combinations were studied, such that the impact of various system parameters (e.g., the size of the opening, location of the openings, the relative displacement of the openings in the two layers) could be assessed both empirically and computationally. Furthermore, various levels of sound absorption in the double wall cavity (realized with absorber panels) were considered and tested. The resulting comprehensive set of parametric configurations was subject of systematic sound transmission measurements. Using the results of the measurements, multivariable analysis and curve-fitting techniques were deployed toward developing empirically-based equations for the prediction of the sound insulation of double-leaf facades with openings for natural ventilation. Furthermore, a simple analytical model was proposed that could be also applied toward predicting the sound transmission of such constructions. The results of empirically-based and analytical models are compared with the measurements results to discuss the potential and limitations of their predictive performance.