The air conditioner is one of the most energy intensive systems in the car. His work has a particularly “painful” effect on electrical transmissions. Israeli scientists have come up with a special film coating that acts as a “black hole” and causes the sun to cool rather than heat the car’s body.
At the heart of the new technology proposed by the team of the start-up company SolCold is the phenomenon of anti-Stokes displacement, in which the emitted photon has more energy than the absorbed photon. In other words, photons react with the surface and “bounce” back with more energy than was used in the impact. Thus, the sunlight reflected from a special surface does not heat it, but on the contrary – cools it.
The main difficulty in creating the new coating was to transfer in real conditions the anti-Stokes effect of displacement, which is usually observed in space or in the laboratory. However, SolCold specialists have managed to make foil for the roof and dashboard of an ordinary old Volkswagen Polo hatchback.
In the video you can see the experiment showing how three identical white cars behave on a hot sunny day. One is covered with SolCold-film and left in the sun, the second stands nearby without any cover, and the third is without film, but in the shade. As a result, the interior of the first car warms up to only 37 degrees Celsius, the second – up to 55 degrees, and the third – up to 40 degrees.
SolCold claims that depending on the size of the car’s interior, the temperature inside can drop by 20 to 70%. So far, the film is at the prototype stage, but it is planned to be used not only for cooling cars, but also for buildings or entire cities.