How much will a mist system drop the temperature?

March 20th, 2014 | Posted by fogco_admin

It is one of the most common questions we hear.  ‘How much of a temperature drop will I get on my patio if I install a high pressure misting system?”.

The answer to this question will depend on a number of factors.  Before we answer the question, lets consider the different variables.

1) Hot and dry climates provide the optimum conditions for a misting system.  The air has the ability to absorb large amounts of water and that process reduces the temperature. The higher the humidity, the less water that can be absorbed and the smaller the temperature drop that can be achieved.

2)  Higher temperatures provide the opportunity for the maximum reduction in temperature.  A mist system can achieve a much greater degree of temperature drop when the outside temperature is 120° versus only 75°.

3) Although the wind will not affect the cooling capability of a misting system, it does affect where the cooling goes and how quickly it is absorbed by the hotter surrounding air.  A mist system will provide more noticeable cooling on calm days.

4) Traditionally, placing the mist line around the perimeter of the area to be cooled was the standard practice.  For line systems, that is still the preferred approach.  Although it will sacrifice some of the cooling effect from the mist system, it will typically ensure that there is no excessive moisture inside the patio and higher humidity levels inside the patio can be avoided.

There are other factors that would affect how much cooling a mist system will provide, but these are the most critical.

So, in a dry climate on a calm day with temperature in the 110° range, a properly designed and installed perimeter line mist system will be able to drop the temperatures by 30° within a few feet of the mist line; the system will provide about 15° of cooling six to eight feet from the mist line;  and about 10° of cooling ten to fifteen feet from the mist line.  The further away from the mist, the less cooling provided.

With higher humidity levels, the cooling capability of a mist system will be reduced accordingly.  With humidity levels above 50% and temperatures in the mid 90° range, a maximum temperature reduction of 5° to 10° is expected.

In an ongoing effort to improve the cooling capability of misting systems, Fogco has developed an innovative product that can be effectively mounted INSIDE the patio and provide precise and controlled cooling without excessive moisture and without increasing the humidity level.

This innovative product is called The Revolution® WindChill.  It is a patio cooling system that includes a high velocity fan that provides over 2000 cfm air flow. This air flow is used to carry the fog creating a contained ‘wind chill’ and adding to the fans cooling capability. Because of its unique design, it is more effective than traditional perimeter line systems and is capable of providing up to 30° temperature drop throughout the patio.  Checkout this new product here.