The Mist Cooling Principle

Mist Cooling works by forcing water through our specially designed mist nozzles; this creates a mist (fog) of ultra fine water droplets with an average size of 25 microns or less. With high pressure mist cooling you will get an even smaller droplet size, as little as 5 microns.  This creates a surface area larger than a football field from just one gallon of water.  Imagine how quickly that will evaporate!

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These tiny water droplets (fog) quickly absorb the energy (heat) present in the environment and evaporate, becoming water vapor (gas). The energy (heat) used to change the water to a gas is eliminated from the environment, hence the air is cooled. 

! Fact: 1 Gallon of water has the potential cooling of 8000 BTUs / hr.  Our High Pressure Mist Cooling Systems Deliver .25 GPM to 25 GPM.  That’s a lot of BTU’s!

How does relative humidity affect Mist Cooling?

Relative humidity is the amount of moisture (water) in the air compared to the amount of moisture the air could absorb at the same temperature. This is a crucial factor in determining the maximum outdoor mist cooling potential. The lower the relative humidity, the more water can be vaporized allowing more heat to be removed.  

! To accurately determine how effective mist cooling will be for your area, you must first know the “Real” Humidity during the time of day you will be most likely to use a mist cooling system.  Most people think that the humidity reported by the local weatherman is the actual humidity all day long.  In fact, it is usually only the highest humidity level for that day.  This is misleading because the humidity dramatically lowers as the temperature rises.  As an example: The humidity may be 90% early in the morning when the temperature is 75 degrees but by Noon the humidity may drop to only 50% because the temperature is now 90 degrees.  This is because the air can hold much more water at 90 degrees then at 75 degrees. Check with a good weather website like “Underground Weather” to see your humidity levels for different times of the day.

Because of this, a good Outdoor Mist Cooling System can be used effectively in most geographical locations, especially if you add the wind chill factor of Misting Fans.  This is because when temperatures reach their peak during the day, humidity is normally at its lowest point allowing mist cooling to do its job.

Chart For Maximum Potential Temperature Drop From a High Pressure Mist Cooling System:

mist cooling graph

Example: If the temperature is 90 degrees F with 30% relative humidity and a maximum temperature drop of 25 degrees F, therefore using a High Pressure Misting Cooling System, the temperature could drop to 65 degrees F (subtract the Catalog temperature of 90 degrees F from the maximum temperature drop of 25 degrees F).  You can also add misting fans for an even better mist cooling effect.