05 Dec '17, 3pm

NREL @NREL develops switchable solar window

The new windows rely on advanced materials such as perovskites and single-walled carbon nanotubes. The technology responds to heat by transforming from transparent to tinted and as the window darkens, it generates electricity. The colour change is driven by molecules of methylamine that are reversibly absorbed into the device. When solar energy heats the device up, the molecules are driven out and the device is darkened. When the sun isn’t shining, the device is cooled back down and the molecules are re-absorbed into the window, thus turning it transparent. The demonstration device developed by the NREL allows an average of 68 percent light in the visible portion of the solar spectrum to pass through when it’s in a transparent, or bleached, state. This changes to only 3 percent when the window changes colour, a process that took only 3 minutes during testing. Existing sola...

Full article: https://www.renewableenergymagazine.com/pv_solar/nrel-dev...

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