Thermal and acoustic properties of aerogels: preliminary investigation of the influence of granule size


MORETTI E., MERLI F., Cuce E. , BURATTI C.

8th International Conference on Sustainability in Energy and Buildings (SEB), Turin, Italy, 11 - 13 September 2016, vol.111, pp.482-490 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 111
  • Doi Number: 10.1016/j.egypro.2017.03.209
  • City: Turin
  • Country: Italy
  • Page Numbers: pp.482-490
  • Keywords: Silica aerogel, Thermal properties, Acoustic insulation, Building refurbishment, Transmission loss (TL), Thermal conducitivity, FIBER INSULATION PANELS, PERFORMANCE EVALUATION, GLAZING SYSTEMS, SILICA AEROGEL, BUILDINGS, IMPACT, SUPERINSULATION, ENERGY

Abstract

The influence of granules size in silica aerogels is experimentally investigated in terms of thermal and acoustic performance characteristics. The transmission loss (TL) is measured at normal incidence in a traditional impedance tube, whereas the thermal conductivity (lambda) is evaluated using a Hot Plate apparatus, setting up an appropriate methodology, due to the nature of the sample. The results reveal that the small granules (granules size in the 0.01-1.2 mm range), which have the highest density, have the best performance both in terms of thermal and acoustic properties. Depending on the granules size, lambda varies in 19-22 mW/mK range at 10 degrees C, whereas a TL equal to 13 dB at about 6400 Hz for 20 mm thickness is obtained for small granules. (C) 2017 The Authors. Published by Elsevier Ltd.