By Kayla Wiles
What if paint could cool off a building enough to not need air conditioning?
<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="835862ffe8b025c2f0ae633c999ecb08"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/caFzYvYAUo4?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>The paint would not only send heat away from a surface, but also away from Earth into deep space where heat travels indefinitely at the speed of light. This way, heat doesn't get trapped within the atmosphere and contribute to global warming. A video about this project is available on <a href="https://www.youtube.com/watch?v=caFzYvYAUo4&feature=youtu.be" target="_blank">YouTube</a>.</p><p>"We're not moving heat from the surface to the atmosphere. We're just dumping it all out into the universe, which is an infinite heat sink," said Xiangyu Li, a postdoctoral researcher at the Massachusetts Institute of Technology who worked on this project as a Ph.D. student in Ruan's lab.</p><p>Earth's surface would actually get cooler with this technology if the paint were applied to a variety of surfaces including roads, rooftops and cars all over the world, the researchers said.</p>
An infrared camera image shows that white radiative cooling paint developed by Purdue University researchers (left, purple) can stay cooler in direct sunlight compared with commercial white paint. Purdue University image / Joseph Peoples<p>In a paper published Wednesday (Oct. 21) in the journal <a href="https://doi.org/10.1016/j.xcrp.2020.100221" target="_blank">Cell Reports Physical Science</a>, the researchers show that compared with commercial white paint, the paint that they developed can maintain a lower temperature under direct sunlight and reflect more ultraviolet rays.</p><p>Their proof is infrared camera images taken of the two paints in rooftop experiments.</p><p>"An infrared camera gives you a temperature reading just like a thermometer would to judge if someone has a fever. These readings confirmed that our paint has a lower temperature than both its surroundings and the commercial counterpart," Ruan said.</p><p>Commercial "heat rejecting paints" currently on the market reflect only 80%-90% of sunlight and cannot achieve temperatures below their surroundings. The white paint that Purdue researchers created reflects 95.5% sunlight and efficiently radiates infrared heat. </p>
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