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STRUCTURES OF SOUND ABSORBING AND THERMAL CONDUCTIVITY COMPOSITE FROM RAW RENEWABLE MATERIALS

Edgars Kirilovs

Abstract

Renewable raw materials, including natural fiber sources, are the future of storage resources with a variety of positive effects on both the planet ecosystem and the living and working environment, and the energy consumption of delivering the required functionality. Noise reduction is a significant component in creating a professional and suitable work environment as open-plan offices have become a quintessential trend of the 21st century. The most common solutions in noise control include installation of noise absorption barriers and acoustic systems. Bio-based materials show good sound absorption performances, at the same time leaving much lower environmental impact than traditionally used synthetic materials. One of the most important energy-saving types is to reduce energy consumption in buildings by insulating them. Research is focused on designating the optimal structure of composite materials in order to obtain a material with high textural qualities of the surface and a noise absorption level that reaches an average noise absorption coefficient value of ?w = 0,5 in at least one set of specified frequencies. Following variables were analyzed in the research: the proportion rate of wool and wood shaving fibers, the panel layer thickness within 15mm ? 25mm range, the number of layers per sample material. For measuring the acoustic properties of the sample materials an impedance tube was used. The measurements were carried out in 8 different sample categories, total of 40 samples were prepared and tested. After obtaining sound absorption coefficients, three samples with the highest sound absorption indices were selected for thermal conductivity measurements.

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DOI resolver: doi.org/10.5593/sgem2018/6.3/s26.044

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