When natural ventilation is not enough, cooltowers at the Zion National Park Visitor Center help bring the temperature down.
Water is pumped over pads located at the top of the tower.
This water evaporates, cooling the air. The energy management computer controls these openings and can direct cool air into the building or out onto the patio. The only energy required for the towers is a fractional horsepower pump used to circulate water over the pads. No fans are needed. Measured flows from the tower are approximately 8000 cubic feet per minute for each tower.