If these walls could cool

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[Paper: Passive cooling paint enabled by rational design of thermal-optical and mass transfer properties].

By Jipeng Fei et al, Science. 

Editor's summary: The top and exterior of buildings can be used to passively cool, but this requires materials with the right properties to do so effectively. Fei et al. designed a paint that cools both radiatively and through evaporation and that appears to keep buildings relatively cool even in humid environments. Although radiative cooling is effective at reducing temperature, it requires the material to be sky-facing. Designing a paint that also cools through evaporation allows the material to be effective when applied to the sides of the buildings as well. —Brent Grocholski. 

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