Window film could even out the indoor temperature using solar energy

phys.org | 10/3/2018 | Staff
xxlauzyxx (Posted by) Level 3
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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. The molecule has the unique ability to capture energy from the sun's rays and release it later as heat. This is shown by researchers at Chalmers University of Technology, Sweden, in the scientific journal Advanced Science.

On sunny summer days it can be little short of unbearable to stay indoors or in cars. The heat radiates in and creates an unpleasantly high temperature for people, animals and plants. Using energy-intensive systems such as air conditioning and fans means combating the thermal energy with other forms of energy. Researchers at Chalmers University of Technology are proposing a method that utilizes the heat and distributes it evenly over a longer period instead.

Molecule - Sun - Rays - Photons - Changes

When their specially designed molecule is struck by the sun's rays it captures photons and simultaneously changes form—it is isomerized. When the sun stops shining on the window film the molecules release heat for up to eight hours after the sun has set.

"The aim is to create a pleasant indoor environment even when the sun is at its hottest, without consuming any energy or having to shut ourselves behind blinds. Why not make the most of the energy that we get free of charge instead of trying to fight it," says chemist Kasper Moth-Poulsen, who is leading the research.

Dawn - Film - Energy - Orange - Colors

At dawn when the film has not absorbed any solar energy it is yellow or orange, since these colors are the opposite of blue and green, which is the light spectrum that the researchers have chosen to capture from the sun. When the molecule captures solar energy...
(Excerpt) Read more at: phys.org
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