Civil Engineering Reference
In-Depth Information
conductivities can be much higher than for ITO and its alternatives, and the metal
thickness can be correspondingly smaller in a device. The luminous absorptance,
typically, is no larger than some percent. The metal films should be embedded
between high-refractive-index coatings in order to benefit from induced trans-
mittance. Multilayer coatings of this kind are used commercially on a very large
scale in windows with low thermal emittance (''low-E'') and hence good thermal
insulation, as well as for windows with large near-infrared reflectance (''solar
control'') and thereby diminished need for space cooling (Gläser
2000
). Figure
10
illustrates typical properties of fully developed (commercial) coatings for low-
E and solar control applications (International Glazing Database
2012
). These
types of coated glass are of interest also for electrochromic glazings, although it
Fig. 10 Spectral
transmittance T and
reflectance from the front side
R
f
and back side R
b
for glass
coated with metal-based films
optimized for solar control
(upper panel) and low
thermal emittance (lower
panel). From the International
Glazing Database (
2012
)
