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Friday, July 30, 2021

This is the whitest of all whites, able to cool entire buildings

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Kamal Saini
Kamal S. has been Journalist and Writer for Business, Hardware and Gadgets at Revyuh.com since 2018. He deals with B2b, Funding, Blockchain, Law, IT security, privacy, surveillance, digital self-defense and network policy. As part of his studies of political science, sociology and law, he researched the impact of technology on human coexistence. Email: kamal (at) revyuh (dot) com

Scientists have created an ultra-white paint that works similar to the vantablack. While this ultra-black material can absorb more than 99.96% of sunlight, white is able to reflect 95.5% of all photons that hit it.

Instead of heating up in direct light, objects painted with this new acrylic material remain cooler than room temperature. Other paints that reject heat at the moment can only reflect between 80% and 90% of the sunlight and cannot reach temperatures below ambient.

During two days of testing in different locations and under various weather conditions, researchers of the new paint discovered that it could disperse 95.5% of sunlight, remaining 10 degrees below room temperature at night and at least 1.7 degrees C below room temperature at noon.

Now, scientists are very interested in radiation cooling, a technology to reflect the heat of a building into space, but it is much more difficult to achieve than radiant heating. Under current conditions, when buildings are cooled with air conditioning by spending a lot of energy and emitting it into the atmosphere, damaging the ecology, this could be the future of climate control.

The new acrylic paint was made using high particle concentration calcium carbonate fillers of a wide range of sizes, which can efficiently disperse all wavelengths of the solar spectrum.

The paint matrix also has a vibratory resonance peak, which ensures that a large amount of heat is reflected outward, at a much higher speed than other paintings of this type can achieve.

Among the advantages of the substance is its ability to cover the surfaces and dry on them in a very similar way to ordinary paint. It is abrasion-resistant, waterproof and can withstand the weather for at least three weeks, although longer tests are currently underway.

“Our paint is compatible with the manufacturing process of commercial paint, and the cost can be comparable or even lower,” says mechanical engineer Xiulin Ruan of Purdue University in Indiana (USA). 

Scientists hope the invention will help us in the fight against global warming.

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