Scientists have developed a paint that can cool buildings, reflecting up to 98% of the incoming he.
The research team has provided a method to create an improved white paint that, when applied to the roof or exterior walls of a building, reflects up to 98% of the infrared radiation from the sun.
Everyone knows that white clothing reflects light better and heats up less, so it is more comfortable in hot weather. This principle works for other objects as well, such as buildings. However, existing white paints reflect a maximum of 85% of solar radiation, and absorb the rest of the energy.
A team from the University of California Los Angeles decided to improve this figure in order to use paint for passive radiation cooling in the daytime.
To do this, instead of titanium oxide, they used cheaper ingredients such as barite and Teflon, reduced the concentration of polymer binders that absorb heat well, and made other small changes to the composition..
As a result of all the modifications, the resulting paint is able to reflect up to 98% of the incoming radiation, lowering the temperature in the room and helping to save on cooling..
We also previously reported on the development of a simple passive heat dissipation system to help fight heat without electricity..
text: Ilya Bauer, photo: UCLA