Lighting and Ventilation

State of the Art Greenhouses operate, dramatically reducing their energy use and increasing yields and crop quality through lighting energy management systems integrated with carbon dioxide supplementation, ventilation improvements, and humidity control.
 

Evaporative cooling is a simple system that uses the heat in the air to evaporate water from leaves and other wetted surfaces. It can cool the greenhouse to 10-20° F below the outside temperature. It takes 1 Btu of heat to raise the temperature of 1 pound of water by 1° F, but it takes 1,060 Btu’s of heat to convert the 1 pound to a vapor.

With an evaporative cooling system, humid air containing the heat that it picked up within the greenhouse is exhausted through the vents or fans to be replaced by cooler, drier outside air.