A Misting Systems Primer, an overview of components and opeation.

A Misting Systems overview.

Specifically high pressure misting system. They use a pump to build water pressure up to 1000 psi. However, some systems run as low as 300 psi, and some even at 150 psi.

Water is delivered to a nozzle through a piping system. The nozzles has a small orifice at the tip that sprays the water out in a very fine mist. So fine that it completely evaporates into the air in a short distance. Typically this distance is about 5 feet for a very small orifice nozzles. Larger orifice nozzles can spray a mist 10 to 15 feet.

What is this " Misting Systems" used for?

Well, up in the northern climates it's used effectively for humidification. In plants and buildings mist can humidify large areas effectivley.

As higher levels of technology make their way into manufacturing opeartion humidity control becomes necessary. Mist humidification is the most cost effective answer in these applications.

In the summer misting can be used for patio cooling, green house applications and dust control.

Tell me more about misting system.

We talked about the pump and nozzles in the first paragraph.

Since we are working with high pressure strong tubing is needed to take the water to the nozzle. Stainless Steel tubing is used some, as is copper tubing. A strong thick wall plastic tube is a third alternative.

The pipe carries the water from the pump to the nozzles. That can be a long distance. Sometimes several 100 feet. A variety of fitting are used to connect the tube together, compression, slip-lock, and quick connect.

Large quantities of nozzles are used in plant application. Many times 100s of nozzles will be used in one area.

For a outdoor patio misting system you may have only 10 or 15 nozzles. This type of system would use a small pump and lower pressures. Plastic fittings provide a cost effective solution.

The nozzles that produce mist range in capacity and size. Capacity is the amount of water consumed. Size could also mean capacity but could mean thread connection or physical size.

How does a nozzle cool?

When water evaporates it cools the surrounding air. Technically called the lateen heat of evporations.

It take energy, heat energy, to change water dropets to water vapor.

Heat is taken out of the air by the water evaporating. You could say that the water absorbs the heat as it evaporates. It may see strange but the same thing happens when a thunder storm comes through on a hot day. The rain has a cooling effect as it evaporates. Heat is pulled out of the air by the evaporation process.

What does a system look like?

The look will vary depending on the application. In a plant you will have a pump package and a control panel. They are typically mounted near a water supply and drain, utility closet where a slop sink is located. In smaller application you may have just a pump package with the controls built in.

What do the controls do?

The controls do mainly two things. One, start the pump when needed. Two, stop the pump when needed or stop the pump when something goes wrong, safety stop. The, something goes wrong, can be many things, loss of water, leaks, low pressures, to name a few. Control also display operating parameters, let you know whats going on, and alarms, what went wrong.

What else can you tell me.

The water has to be pretty clean. It should be filtered. The nozzles orifices are small and can clog if a filter is not used. Some nozzles have filters built in but you should still have a pre-filter. It should be a good quality filter that cleans down to the 5 micro level. There are other elements about water that sometimes need to be addressed. They are discussed under water treatment.

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