fromFast Company
1 week agoA city in Southern Spain holds an ancient secret to fighting extreme heat
We have deployed several types of cooling systems here, each one used depending on climatic conditions. The system, created millennia ago but updated for the 21st century, works by cooling water underground in the naturally low temperatures at night. To cool water more quickly, some is also sent to the roof via solar-powered pumps and sprayed out of nozzles in a thin layer through a method known as a falling film, before draining back down underground.
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