Civil Engineering Reference
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1. 0
0.8
0.6
0.4
Translucent / fractured
Semi-translucent / fractured
Semi-translucent /regular
0.2
0.0 400
600
800
1000
1200
λ (nm)
1400
1600
1800
2000
10.6 Spectral (normal-hemispherical) transmittance of different silica
aerogel layers (translucent/fractured, semi-translucent/regular and
semitranslucent/fractured), 10 mm thickness (Reim et al. , 2002).
Coating
Coating
Granular silica
aerogel
Pane
Gas
Gas
Pane
Double-
skin sheet
12 mm
16 mm
12 mm
10.7 Granular aerogel window prototype consisting of two glass
panes with low-e coating on the inside, two gas gaps and an aerogel-
granulate fi lled PMMA double-skin sheet (Reim et al. , 2005).
￿ ￿ ￿ ￿ ￿ ￿
Depending on the fi lling, the low-e coating emissivity and granular aerogel
kind, an U-value in the 0.37-0.56 W/(m 2 K) range and a total solar energy
transmittance (solar factor, g ) in the 17-45% range were obtained (Table
10.1, Reim et al. , 2005). The directional-hemispherical transmittance was in
the 0.19-0.54 range if considering the visual properties.
Finally, for the German climate (Reim et al. , 2002), aerogel glazing
mounted into a north-oriented façade shows the lowest thermal losses in
the heating period if compared to a triple glazing window and to opaque
insulation; in fact, the energetic balance of the aerogel glazing is signifi -
cantly better than that of a triple glazing from 15 September to 15 April.
Aerogel glazing offers the possibility to provide diffuse natural light inside
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