How to Estimate the Water Use of a Misting System?

How much water does outdoor misting system require? This is highly consequential to be aware of! Water usage of a misting system simply depends on the type of system used, but it is said that between 600ml and 800ml of water is used approximately per minute. In order to estimate water use of a misting system, there are three things you need to know:

  • The type of nozzle
  • Number of nozzles
  • Frequency of use
  • Water pressure of the system

Misting nozzle

In order to create a cooling mist, the size of the mist nozzle opening which is coined as the orifice is balanced by the system's water pressure and flow rate (amount of water). In general, nozzles have a tendency to squirt less water at lower pressures compared to high pressures. As a matter of fact, at lower water pressures mist nozzles will not make the grade to toil. When the pressure of the water at the nozzle increases, there will be an augmentation in the flow rate through the nozzle. So, the higher the water pressure, the slighter the nozzle opening is needed.

Larger misting should be used with low and medium pressure systems and smaller nozzles should be used with high pressure misting systems. Sending fine mist will turn out to be a problem if you select a nozzle of smaller size; this is because the pump won't be able to send a sufficient amount of water through the nozzle and vice versa. It is not a matter of "more is better", but it is all about a sense of balance.

  • .012" / .3 mm -used for most of the systems, it works at its best for medium pressure misting systems. It provides minimal moisture, and complete evaporation, suggested for both open and enclosed areas.
  • .008" / .2 mm -perfect for systems using less water capacity with small droplet size, minimal moisture, and complete evaporation. Works its best for High pressure misting systems.
  • .006" / .15 mm –It provides similar results to the .008" nozzle.

Number of nozzles


The amount of water used by your misting system also depends on the number of nozzles. Number of nozzles required is determined by several factors such as the water pressure, flow rate at the spigot, size of the pipes that are delivering the water to misting nozzles.

Water pressure of the system

Water droplet size that makes up the mist is the determining factor of the cooling effect. Evaporation of each of the little droplet is what cools the air around, compared to smaller droplets; bigger ones take just about one thousandth of a second longer. Chances are there for you to get wet, if they land on you before they are evaporated completely, on the other hand, if you end up being in a fairly dry air, this can feel amazing, as the water evaporates off of your skin. Nevertheless, in case of extreme humid weather it can turn out to be uncomfortable. The smaller droplets evaporating mid-air creates a stronger cooling effect which is coined as flash evaporation.

  • If the diameter of mist dewdrops is condensed by one-half, the amount of droplets produced with a given volume is amplified by octa counts.
  • Increasing twofold the droplet diameter will cut down the number produced by octa counts.

Listed below are the nozzle sizes' using 1000 psi / 70 bars and it denotes sampling of water droplet sizes. Measured in microns, this will help out in estimating the water use of a misting system. 1 micron is .001mm; let's have a look at the nozzle size and the droplets range

  • .012" / .3 mm - 1.6 microns to 39.1 microns
  • .008" / .2 mm - 1.4 microns to 37.9 microns
  • .006" / .15 mm - 1.2 microns to 36.4 microns

When you are aware of the water pressure you want to use then you can pick out a mist nozzle. For instance, if you choose a nozzle that uses 13.5 GPH (gallons per hour) / 51.1 LPH (liters per hour) (ballpark figure), this multiplied by the number of nozzles say 5, then it would come up to 13.5 GPH / 51.1 LPH multiplied by 5 = 67.5 GPH / 255 LPH. Taking this a step further to estimate the water use, you will have to append the running hours of the system. For example, if its 5 hours, then 67.5 GPH / 255 LPH multiplied by 5= 337.5 gallons /1275 liters per 5 hours.

Note- Nozzle flow rates may fluctuate depending on your home's water pressure.

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