The smart windows, developed at NREL, provide a cleaner cooling solution than AC.
Anyone who lives in a hot country knows that blackout blinds don't only keep the light out, they also keep the heat out. But what if, instead of simply blocking that light, we could harvest it for energy?" that not only change color automatically when heated by sunlight to keep buildings cool, they also double up as solar panels.
The research poses a double whammy of clean energy benefits as it provides solar energy at the same time as reducing a building's reliance on air conditioning.titled"Reversible Multicolor Chromism in Layered Formamidinium Metal Halide Perovskites," researchers at the US Department of Energy’s National Renewable Energy Laboratory detail a"thermochromic photovoltaic" tech that switches colors when heated by sunlight to reduce the need for cooling.
The vapor causes the perovskite crystals to rearrange themselves at higher temperatures, first into a chain, then a sheet, and then a cube. Each shape changes the window's color, blocking sunlight to different degrees.
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