Simple in composition and method, the new cooling paint consists of a commercially available polymer, called poly(vinylidene fluoride-co-hexafluoropropene), a solvent (acetone), and a small amount of water. See also: Buildings Emissivity Heat transfer Infrared radiation Paint and coatings Radiation Reflection of electromagnetic radiation Solar radiationĬool roofs are designed to reflect more sunlight than a standard roof on a hot and sunny day.

Cool roofs designed using metals (such as aluminum) or white-pigmented paints help keep building temperatures lower by reflecting sunlight but are less effective at emitting the heat they absorb because heat is reflected inside these materials. The cooling effect is based on a phenomenon known as passive daytime radiative cooling, whereby a surface cools without any energy input by reflecting ultraviolet to near-infrared solar radiation (278- to 4600-nanometer wavelengths) and radiating long-wave radiation (8000- to 13,000-nanometer wavelengths) through the atmosphere to outer space. The paint can be easily applied to most surfaces, including the exterior walls and roofs of existing buildings. The coating can be used to cool buildings and reduce air-conditioning use, keeping surfaces painted with the material about 6 degrees Celsius cooler than the surrounding air temperature. In the journal Science (September 2018), researchers reported a method for making a coating that reflects sunlight and radiates heat.

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