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Swedish researchers at the Chalmers University of Technology have developed a window film that can capture the heat energy from the day’s strongest sunlight and release it gradually. This prevents rooms from becoming too hot during the day. The window film doesn’t need any additional energy to work, making it much more environmentally friendly than air conditioning. The window film, which changes color as it absorbs and releases solar energy, has the potential to significantly reduce energy consumption and power bills for large buildings.

Key Takeaways:

  • Scientists at Chalmers University of Technology in Sweden have devised a molecule that can capture the sun’s rays, hold it and then release it later as heat.
  • The specially designed molecule when hit by a sun ray captures photons, whereupon it changes form, becoming isomerised.
  • When the sun has stopped shining on the molecule it can release heat for up to eight hours after the sun’s disappearance.

“A window film with a specially designed molecule could be capable of taking the edge off the worst midday heat and instead distributing it evenly from morning to evening.”

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