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
  • Recep Tayyip Erdoğan University Affiliated: No

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.