It could help cool areas using less air conditioning.
which means that the pigment can scatter most of the sunlight it receives. Moreover, the researchers put to use the material's unique morphology to deliver high solar reflectance.Researchers in the mechanical engineering department at Purdue used computer simulations to understand how this new morphology termed nanoplatelets helps. They found that when compared to spherical nanoparticles that are used in other cooling paints, nanoplatelets can bounce back solar radiation more effectively.
Additionally, paint made using this material trapped air at nanoscales which made it highly porous. This offers a significant advantage since the painted surface has a lower density of paint and hence lower weight too. When compared to paint made using barium sulfate, the new paint weighs nearly 80 percent less without compromising on the solar reflectance.
This opens up the potential applications of the paint to areas of aerospace as well. Using this paint on aircraft can help keep its interiors cooler by up to 4.5 degrees Celsius, reducing the. Using the paint for spacecraft can help in the reduction of the weight that needs to be carried to orbit. "This not only saves money, but it reduces energy usage, which in turn reduces greenhouse gas emissions," said Xiulin Ruan, a professor at Purdue University, who developed the paint.
Interestingly, the paint also radiates the heat into deep space, thereby directly cooling the planet too. This is in stark difference from other cooling technologies that rely on heat transfer to cool buildings, causing a build-up of heat in the atmosphere.Thin and lightweight radiative cooling paints are needed for many weight-sensitive applications. However, it is difficult to achieve high solar reflectance with thin layers.
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