Can a greenhouse fogger provide greenhouse cooling of 20 degrees Fahrenheit or more?
The answer to this question entirely depends on the type of greenhouse fogger you use. Many of the fogging systems that are installed in greenhouses around the globe utilize high pressure fog emitters that create a fog that provides a cooling and humidity control effect but since they operate at such high pressure, and have such small nozzle orifices, they can have significant maintenance issues (especially if they are used to apply chemicals to the plants in the greenhouse).
A newer technology that has emerged in the North American greenhouse industry recently is a low pressure fogging system that produces a very small, consistently sized 4.2 micron fog droplet. This system operates at 110 PSI which also makes it an excellent option for applying bactericides and fungicides to your greenhouse plants (without worry of nozzles becoming clogged).
However, the real strength of this technology is how efficiently it maintains exacting levels of humidity in your greenhouse. Since it's fog emitters produce a fog droplet that is always approximately 4.2 microns in size, the fog droplet very efficiently evaporates while suspended in the air. Not only does this allow for precise humidity control, it also allows the system to very aggressively reduce temperatures in your greenhouse (by degrees Fahrenheit or more even when temperatures exceed 100 degrees).
Finally, since the fog droplets are of consistent size and small enough to evaporate fully in the air, they don't gather on surfaces in your greenhouse. This is of paramount importance because wet surfaces in a greenhouse can lead to mold and bacteria growth.
The fog of this proprietary low pressure technology is often refered to as dry fog due to it's highly evaporative nature. To learn more about this technology please visit www.fruittek.com.
