A misting system without a high pressure pump is a micro IRRIGATION system—good for plants , bad for cooling !
The HIGH PRESSURE PUMP CONTROLLER , operating at 70 Bar (1000 psi) ensures an adequate supply of correctly sized atomized water droplets and prevents wetting of the surrounding area.
A duty cycle timer incorporated into the pump permits timing of the operating cycle. This permits control of the amount of micro droplets being produced whilst the high pressure operation ensures droplets sized to permit adequate hang time in the air resulting in the flash evaporation process - critical to cooling. Oversized droplets are heavy and fall to the ground before they flash evaporate. This is what causes wetting. A high pressure pump controller is critical to an effective mist cooling system. See hang time (Drift) chart below.
| Diameter in microns | Time to fall 10 feet in still air |
| 1 (fog) | 28 hours |
|
10 (fog) |
17 minutes |
| 100 (fog) | 11 seconds |
| 200 (fine spray) | 4 seconds |
| 400 (course spray) | 2 seconds |
| 1,000 (course spray) | 1 second |
