Electrochromic “Smart Windows” Could One Day Become the Norm

Electrochromic “Smart Windows” Could One Day Become the NormBy nearly every measure, we are living in the midst of an increasingly “smart” world. We have smart cars, smart TVs, smart homes, and smart cities. As for the latest development in smart technology? That would be windows, folks.

Most people already understand the concept of “smart” devices. They track the ideal temperature in your home. They collect data on your favorite Netflix shows. Some are voice-activated, while others turn on at the detection of your fingerprint. And when it comes to smart windows, there are a host of innovations in the works.

For starters, you’ll want to look to the arrival of electrochromic glass.

At the simple push of a button, this glass can fade from light to dark—or clear to opaque—and back again. In other words, you can forget wrestling with annoying blinds. Electrochromic glass or “smart” glass has been designed according to high-quality metal-oxide coatings, which are deposited by similar processes to silicon computer chips. Ordinary windows, on the other hand, are born out of a single vertical pane of glass, while more sophisticated windows are only glazed with metallic chemicals.

But while you might think of electrochromic glass as exclusively glass, the window technology can actually be applied to be plastic as well. In a complex process known as “sputtering,” thin films of material are added on top of one another, and those materials are then set to coat the window of choice.

In terms of nuts and bolts, smart windows have been proven to boast a huge environmental benefit. When dark, they reflect nearly 98 percent of the light shining on them, which can not only reduce the need for air conditioning, but it can lower the day-to-day costs of installing and running an HVAC system as well. Additionally, because the windows are electrically operated, you can control the amount of light according to a smart home system or sunlight sensor, and can therefore choose to use the technology based on whether or not people are inside of a room.

That said, smart windows could feasibly save up to 8 percent of a building’s total energy consumption, according to the US Department of Energy’s National Renewable Energy Laboratory. Other benefits include added privacy, convenience, and security, given smart windows have a higher reliability than clumsy curtains or blinds.

Yet downsides are a reality, too. Given electrochromic glass is printed with electrodes and metal coatings, it’s significantly more expensive than ordinary glass. Questions have also been raised about the longevity of the materials. Conventional vinyl windows typically degrade after about 20 to 30 years, and it remains to be seen how long smart windows will be able to outlast their counterparts.

Then again, smart windows are still in their early days of testing. In the meantime, we’re eager to see how new window designs might become the standard of the future, and we’ll certainly be watching as those developments unfold.


george wohanka

SPD deserves a mention even though more expensive than EC. EC is not used in auto glass and has been replaced by SPD in windows on business aircraft due to its’ superior performance.

Edward Vogler

SPD glass also replaced EC as the smart glass used in the 10K square foot roof of the US pavilion at the 2015 Milan Expo.

Architect James Biber made the switch because of SPD’s ability to become dark or clear instantly in response to environmental conditions. It’s also capable selective dimming , like a light with a dimmer switch.

The first large architectural installation of SPD glass was in 2009, at Indiana University’s Health Information and Translational Sciences Building.

Because SPD technology uses a film supplied by Hitachi, it requires no sputtering. The film is simply laminated to glass or plastic. It performs perfectly on flat and curved surfaces of all shapes.


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