'Cool roofs' substantially reduce temperatures during a heat wave, according to new study

2015-12-22T19:39:00-05:00

It is well established that white roofs can mitigate the urban heat island effect, reflecting the sun's energy back into space and reducing a city's temperature. In a new study of Guangzhou, China, researchers found that during a heat wave, the effect is significantly more pronounced. Reflective roofs, also called cool roofs, save energy by keeping buildings cooler, thus reducing the need for air conditioning.

According to a new study by Berkeley lab researchers Dev Millstein, Ronnen Levinson, and Pablo Rosado, alongside Meichun Cao and Zhaohui Lin of the Institute of Atmospheric Physic in Beijing, so-called "cool roofs," or roofs painted white, substantially reduce the urban heat island effect during a heat wave.

Prior research had shown that cool roofs could mitigate the urban heat island effect, but the new study shows just how drastically this can make a difference during a heat wave. Heat waves affect both public health and energy resources, requiring massive amounts of air conditioning and other cooling systems that can overtax the electric grid.

"The hotter it is, the more cooling you get with cool roofs--and it is a significant difference, compared to the margin of error," Millstein told ScienceDaily. "We found that the stagnant conditions of a heat wave, where the air is just sitting over the city, was one of the main factors."

The research was conducted in Guangzhou, a large city ...

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'Cool roofs' substantially reduce temperatures during a heat wave, according to new study