Evaporative cooling works best at certain relative humidity thresholds. When water evaporates it takes heat energy out of air. This science solid and has been known for centuries. Anyone that’s experienced living in the Southwest knows this, which is why the tower in an arid desert environment is a most sensible location.
Seems the prototype is in a less arid environment and must wait for dryer conditions which anyone that has lived on the east coast knows relative humidity drops drastically into the Fall and Winter.
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