Published:
17 abr 2021 12:18 GMT
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The coating is capable of reflecting up to 98.1% of the sunlight that falls on a certain surface and keeping it well below the temperature of the ambient environment.
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In an effort to curb global warming, researchers at Purdue University (Indiana, USA) created a paint so white that, in addition to reflecting almost all light, it also rejects heat.
According to the research published this Thursday in the magazine ACS Applied Materials & Interfaces, this acrylic paint is capable of reflecting up to 98.1% of sunlight on a certain surface, which could help keep it at a temperature well below the ambient environment. In other words, if a building is clad with it, its surface could be kept as low as -7.7 degrees Celsius, which in hot regions would help to do without air conditioning.
“Using super-reflective white paint on a large scale in cities like Reno or Phoenix could save up to 80% on air conditioning costs.” https://t.co/qZuMzfR9cd
— Enviro Voter Project (@Enviro_Voter) April 15, 2021
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“If this paint were used to coat a ceiling area of approximately 1,000 square feet [93 metros cuadrados], we estimate that a cooling power of 10 kilowatts could be obtained. That is more powerful than the central air conditioners that most houses use, “explained Xiulin Ruan, professor of mechanical engineering at the university.
How does it work
Two characteristics give the painting its extreme whiteness: first, the high concentration of barium sulfate, a chemical compound used to make photographic paper and cosmetics white, and second, the different particle sizes of the compound.
The amount of light scattered by each of these particles depends on their magnitude, “so a wider range in particle size causes the paint to scatter a larger portion of the spectrum of sunlight.”
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