5/1/2023 0 Comments Paint it white![]() The researchers naturally waned to try using materials that could reflect, rather than absorb, the brutal UV rays. “Commercial white paints are cooler than the other, darker-colored paints, but they are still warmer than the ambient or surrounding temperature,” Ruan notes. Naturally, commercially-available white paints, even those marketed as heat-rejecting products, are cooler than dark paints, but they are still made with titanium dioxide, which absorbs the ultraviolet rays of the sun, causing any surface they are used on to heat up. Barium sulfate particles are game-changer for ultra white paintĪ video produced by the team using an infrared camera exhibits exactly how much the paint cools the surfaces to which it is applied, with the whitest of all white paints represented by a dark purple square in the middle to indicate its cool temperature. Under the sun, it cools below the ambient temperature and that’s hard to achieve,” said Ruan. ![]() “With such little absorption from the sun, our paint loses more heat than it absorbs. “Our paint can lose heat by its own emission-it emits heat to deep space,” Ruan explained to Smithsonian magazine. However, it was at nighttime, when they found the paint led to the surfaces staying 19 degrees cooler than their surroundings, that the revolutionary performance of the paint came to the fore. In broiling Indiana heat, the researchers tested the new paint on a Purdue campus building during midday on sunny days, proving that the paint kept outdoor temps a respectable eight degrees cooler than the ambient temperature at the time. On the roof of a 1,000-square-foot home, a cooling power of 10 kilowatts will be generated by the paint, which, Ruan states, is more powerful than most residential central air conditioners. Cooling effect exceeds that of an air conditioner When the paint is applied to the roof of a building, the researchers say, this translates into powerful savings. The new Purdue paint not only reflects nearly all of the sun’s rays back into space but also sends infrared heat away from the surface of a building This equates to an average cooling power of 113 watts per square meter (10.7 square feet). ![]() Photo Credit: Zde/Wikimedia Commons/ CC BY-SA 4.0 Credit: The church of Taxiarches in the village of Vathy on Sifnos. On sunny days, white paint actually heats up, making it harder to keep interior spaces cooler.Įven the whitest of white paints out there on the commercial market today reflect at most 80 to 90 percent of light, according to Ruan. Contrary to intuition, even white paint absorbs the rays and heat of the sun rather than reflecting most of the heat back into the sky.
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