American and Chinese researchers developed a heat rejecting film that can reflect 70 percent of the heat comes from sun. The research paper published at the journal joule and described about the material that remained highly transparent below 32 degree Celsius and could act as an “autonomous system” to reject heat.

According to researcher of MIT and University of Hong Kong, if a building will get covered by this film, than building’s air conditioning and energy costs could drop by 10 percent.

The film is embedded with tiny micro-particles, made from a type of phase -changing material that shrinks when exposed to high temperature, turning into a more translucent or frosted look.
Researcher made a 12×12 inch film-coated window and the window turned frosty in response to heat from a solar simulator. After testing the film window, solar radiance transmitted through the other side of the window, and found the film was able to reject 70 percent of the heat produced by the lamp.

while measured the temperature inside the film box, inner chamber stay constant 34 degrees. and without the film the inner temperature heated apx. 39 degrees.

Also Read

MIT Developed an Ai system that can learn like a child.

NASA Heat Folding Shield