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This diagram is wrong, it simply wouldn’t work if that was the design. There is no Venturi effect suction power to draw in the cool air.
The wiki has a much better diagram that actually would work ; https://en.m.wikipedia.org/wiki/Qanat#/media/File%3AQanat_wind_tower.svg
Qanat wiki:
And the concept is still in common use. The modern evaporative coolers are called “swamp coolers” in the US.
