Painting roofs white or covering them with a reflective coating would be more effective at cooling cities like London, claimed researchers.
Cool roofs have the dual benefit of not only cooling the outside urban environment but the inside of buildings as well. Researchers at the University College of London discovered that applying white or reflective paint to city roofs would best mitigate the heat this summer.
If the practice of painting roofs were adopted citywide, it would reduce the number of air conditioning systems being used inside, which conversely raises temperatures outside, according to a press release.At the University of London, researchers created a 3D climate model of Greater London based on the two hottest days on record in 2018 to evaluate the most effective heating management system: painted cool roofs, green roofs, solar panels, ground-level tree vegetation, or air conditioning.
First, they calculated that air conditioning heats up the city center “by as much as 1 degree Celsius.” Planting deciduous trees in the city’s greenspaces helped manage the heat overnight, but it didn’t produce encouraging daytime results as levels of humidity increased.
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