The Israelis invented a film that cools a car without air conditioning
Air conditioning is one of the most energy-intensive systems in the car. His work has a particularly ‘painful’ effect on electric 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 body.
At the heart of the new technology, proposed by the team of startup company SolCold, is the phenomenon of anti-Stokes bias, in which the emitted photon has more energy than the absorbed photon. In other words, photons react with the surface and ‘bounce’ 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 a new coating was to convey in real conditions the anti-Stokes effect of displacement, which is usually observed in space or in the laboratory. However, SolCold specialists managed to make foil for the roof and dashboard of an ordinary old Volkswagen Polo hatchback.
In the video you can see an experiment that shows 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 next to it without shelter, and the third 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 interior, the temperature inside can be reduced by 20-70%. So far, the film is at the prototype stage, but it is planned to use it not only for cooling cars, but also for buildings or entire cities.
