AAWSAP DIRD, Aerospace Applications of Programmable Matter, December 2009

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through completely different mechanisms, their effects are complementary and, thus,
their savings can be combined. In addition, while low-E glass reduced peak cooling
loads by 2-14 percent, the dynamic windows provided an additional 5-38 percent
reduction in peak cooling load, allowing significant downsizing of the building's air
conditioning system.
The report concluded that dynamic windows "offer the potential for significantly greater
HVAC savings than can be achieved with currently available high-performance
windows," have "much lower energy costs than static windows," and "provide the best
of all worlds."
Early Commercialization of Smart Materials
In the third quarter of 2009, RavenBrick LLC introduced RavenWindow, an "active­
passive thermoreflective" window film that is transparent when cold and partially
reflective when hot. The dual-purpose smart film is intended to manage and harness
solar heat gain in windows. The film costs much less than do existing smart window
technologies and offers superior energy savings.
Figure 5. Assorted Views of RavenWindow and Ravenlight Filters in the Cold (Transparent) and Hot
(Reflective) State.
RavenWindow film is transparent when cold and partially reflective when hot,
allowing an SHGC range between 0.12 and 0.43-more than twice the range
studied by LBNL. Studies performed by RavenBrick using LBNL tools show
energy savings up to three times those of low-E glass alone.
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