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New color paint to help buildings warm in winter and cool in summer
Scientists at Stanford University in the United States have invented a new type of paint that can keep houses and other buildings cool in summer and warm in winter, thereby significantly reducing energy use and reducing greenhouse gas emissions. Related papers published in the 14th issue of the Proceedings of the National Academy of Sciences.
Cui Yi, senior author of the study and a professor at Stanford National Accelerator Laboratory (SLAC), pointed out that current low-emissivity coatings are usually metallic silver or gray, which limits their use because they are not beautiful enough. The newly invented coating has two layers that are used separately: an infrared-reflective bottom layer of aluminum flakes, and an ultra-thin infrared-transparent top layer made of inorganic nanoparticles of various colors.
Tests showed that in the artificial cold environment experiment, the new coating reduced the energy used for heating by about 36%; in the artificial warm environment, the energy required for cooling was reduced by nearly 21%.
Both layers of the coating are waterproof and can be applied to wet environments. Rinse with a damp cloth or water to clean the painted surface. In addition, after a week of continuous exposure to high temperature (80 ℃), low temperature (-196 ℃) and high acid environment, the performance and aesthetics of the coating are not damaged at all.
For thermal insulation, the new paint can be applied to exterior walls and roofs. Most of the infrared light will pass through its color layer, be reflected by the lower layer, and then return as light, without being absorbed by the building materials as heat. In order to keep the heat in the room, the paint can also be applied to the interior wall, and the lower layer will again reflect the infrared light and transfer the energy in the space.
The coating can also be applied outside of buildings, such as trucks and train cars used for refrigerated transportation, significantly reducing the proportion of refrigeration costs in the transportation budget.
(Editor: Lin Fanxun, Sun Zhao)
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