Thermal and optical performance of silica aerogels are deeply studied and analysed, whereas the investigation of acoustic properties is still limited up to now. The chapter deals with the acoustic potential of different kinds of aerogel and highly energy-efficient transparent systems composed with aerogels. After a short introduction, the characteristics of the raw material (silica aerogel for windows: transparent monolithic and translucent granular) are illustrated, in order to provide information about the general acoustic absorption and insulation properties. Moreover, the acoustic performance of both granular and monolithic systems are discussed, also taking into account real scale applications. In the Literature absorption coefficient and transmission loss data are available for different kinds of aerogel and for some suggested applications. As concerns the granular aerogel form, the influence of granule size and layer thickness on acoustic properties is deepened. The smallest granules have the best acoustic performance, with acoustic absorption coefficient values slightly lower than 1 and sound insulation values of about 20 dB. On the contrary, the monolithic form represents a novelty in building applications because of the difficulty in the preparation of the panes. In particular, only a few data about the acoustic features of the monolithic aerogel and monolithic aerogel composed systems are available. As concern the sound insulation, a 3-dB increase in the sound insulation index (Rw) for a glazing system with a monolith is reached; this is of the same order of data related to granular aerogel windows at real scale.
Acoustic performance of translucent aerogel-based materials
Buratti C.
Writing – Review & Editing
;Belloni E.Writing – Original Draft Preparation
;Merli F.Writing – Original Draft Preparation
;Moretti E.Membro del Collaboration Group
2019
Abstract
Thermal and optical performance of silica aerogels are deeply studied and analysed, whereas the investigation of acoustic properties is still limited up to now. The chapter deals with the acoustic potential of different kinds of aerogel and highly energy-efficient transparent systems composed with aerogels. After a short introduction, the characteristics of the raw material (silica aerogel for windows: transparent monolithic and translucent granular) are illustrated, in order to provide information about the general acoustic absorption and insulation properties. Moreover, the acoustic performance of both granular and monolithic systems are discussed, also taking into account real scale applications. In the Literature absorption coefficient and transmission loss data are available for different kinds of aerogel and for some suggested applications. As concerns the granular aerogel form, the influence of granule size and layer thickness on acoustic properties is deepened. The smallest granules have the best acoustic performance, with acoustic absorption coefficient values slightly lower than 1 and sound insulation values of about 20 dB. On the contrary, the monolithic form represents a novelty in building applications because of the difficulty in the preparation of the panes. In particular, only a few data about the acoustic features of the monolithic aerogel and monolithic aerogel composed systems are available. As concern the sound insulation, a 3-dB increase in the sound insulation index (Rw) for a glazing system with a monolith is reached; this is of the same order of data related to granular aerogel windows at real scale.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
