Developed at Nanyang Technological University, the experimental new "smart window" consists of two panes of ordinary glass, the space between which is filled with a solution consisting of a proprietary hydrogel, water, and a stabilizing compound.

During the day, as sunlight passes through the window, the liquid absorbs and stores that light's thermal energy. This keeps the room from heating up, reducing the need to run the air conditioning. Additionally, as the liquid warms up, the hydrogel within it changes from a transparent to an opaque state. Although this ruins the view out of the window, it also reduces the amount of visible light that passes through from outside, further helping to keep the room cool.

When the sun goes down at night, the gel cools and becomes clear again, releasing the stored thermal energy. Some of that energy passes through the glass and into the room, reducing demands on the building's heating system. And as an added bonus, the smart window reportedly absorbs exterior noise 15 percent more effectively than traditional double-glazed windows.

Based on simulations and real-world testing, it has been determined that use of the windows could reduce energy consumption in office buildings by up to 45 percent. The university is now looking for industry partners to help commercialize the technology.

According to New Atlas