What is the difference between a misting system and a fog system?
A misting system and a fog system are simply two different terms used to describe the same thing.
How do misting systems work?
Misting systems work by forcing mains water via a high pressure pump module and tubing through a specially designed mist nozzle. The brass and stainless steel nozzle has an orifice size of .02mm, thereby producing a micro-fine mist.
The millions of water droplets created are so small that they instantly flash evaporate and absorb the heat in the air. Flash evaporation can reduce the surrounding air temperature by as much as 14 C° in just seconds. Ozmist pump modules pressurize water to 1,000PSI. or 70 BAR.
What are the different systems?
Static Misting Systems
Consist of either a high pressure nylon or stainless steel tube with a series of nozzles inserted in a line. Static systems are commonly used to cool outdoor and indoor areas, provide constant humidification in green houses or dust suppression.
Stainless steel misting rings are commonly fitted to the face of high velocity fans for greater cooling effect. As with our other systems, misting fans use the process of evaporative cooling, otherwise known as Thermal Dynamics. The hotter it is, the quicker evaporation will occur. The quicker the evaporation, the more heat is used in the energy exchange process and the better our misting fans will work. Fans are normally used inside buildings and spread around the area to be cooled. Fans are linked by a high pressure nylon tube to the pump module. Multiple fans can be connected to one pump module.
What sort of temperature reduction can be achieved?
The amount of cooling that can be achieved will depend upon a number of factors. Basically the hotter the ambient temperature and the lower the relative humidity, the quicker evaporation will take place, giving a greater temperature reduction.
Many companies claim that their misting systems are capable of reducing temperatures by up to 22°C. Working from a psychometric Chart this is feasible but it is very unlikely that you could ever achieve such a reduction in temperatures. In our experience it is possible to gain a temperature reduction of between 10° to 14°C in low to medium humidity conditions.
How much water does a misting system use?
This will vary depending on the size of the system and the number of nozzles to be used. Utilizing our .02mm orifice nozzle and our 1000 PSI / 70 BAR pump each nozzle will use approximately .56 L/PM per nozzle. A 30 meter long misting line that has 750mm nozzle spacings would have a total of 40 nozzles. Water usage would be 2.24 L/PM.
Is there any maintenance required?
As with any item of machinery there are some important maintenance issues to consider. At the heart of any misting system is the high pressure pump. The pump will last for many years if it is cared for and regularly serviced.
The primary maintenance for a misting system pump is to check the oil regularly and change it each year. Filter cartridges at the rear of the pump module should also be changed, again, normally at the start of the season. This will depend on the incoming water quality. The only other maintenance for a typical misting system is to periodically clean the nozzles and to drain the system each winter to prevent freezing. With these simple steps, a quality misting system will last for many years.
Do I need to do anything to my misting system during the winter?
To prevent freezing and damage to the pump or the misting system, all of the exposed misting system nozzles in the system should be removed. The misting system line, the misting system pump, and the filtration should be drained.
Can I install a misting system myself?
Ozmist misting systems are designed to be quickly and easily installed with a minimum of tools required. Systems can be supplied in kit form and have everything required for the installation included. Comprehensive instruction manuals are provided with each system.
Depending on location installation can be undertaken by our experienced trade’s people otherwise it could be done by maintenance personal or locally sourced trades people.