Today, no one would design a paint booth without considering control of the psychrometric parameters inside. A relative humidity (RH) of up to 65-75% is often used for waterborne paints to avoid aerosol evaporation, pigment clumping and premature drying, and to achieve a consistent coating rate. Individual manufacturers recommend in their product sheets the ideal conditions under which their paint should be applied. This reduces consumption and makes application more efficient. However, all manufacturers agree that humidity in the booth must be considered and controlled to achieve high quality finishes.

As experts in controlling ambient humidity, we believe that the most economical and effective method of adding the necessary moisture to the painting process is adiabatic humidification. This is both cost and energy efficient and creates a healthy and productive environment in which the best results can be achieved.

How the Evaporative Humidifier Works for Paint Booths

Evaporative humidifiers are designed to increase the water vapour content of the treated air by natural evaporation of water. The air stream to be treated flows through a wet cell panel in a water sprinkler system. This panel consists of corrugated sheets of inorganic paper with stiffening additives and water absorbers. The cross-channel configuration of the panel provides a large air-water contact area that maximises evaporation while minimising resistance to air passing through (load loss). The fisair heF2E non-bonded hygiene panel can be used with any type of water, has hygiene certification and is the most durable available on the market.

Thanks to its modular features, this unit can be easily integrated into existing installations, reducing installation and maintenance times.

Demanding industries such as automotive, railway and aerospace are already using these units to achieve the desired conditions for their processes.

Compared to atomising or water spraying systems, these devices have the following characteristics:

Disadvantages of Not Having an Evaporative Humidifier for Paint Booths

  • Higher initial costs. In many cases, spray systems are more than twice as expensive as compressed air-based systems and three times as expensive as high-pressure systems.
  • For high-pressure systems, an additional reverse osmosis unit is required.
  • The inner part of the supply line has to be made of stainless steel, which increases the cost.
  • The length of the supply line also increases, as a distance of at least 1.5 m is required so that the spray mist can be absorbed by dry air vapour.
  • Pneumatic systems consume a comparatively large amount of electricity, require complex installation and produce a high noise level.
  • Low water pressure atomising systems have a high risk of droplet carryover.

Advantages of the Fisair HEF2E Evaporative Humidifier for Paint Booths

  • Hygienic certification VDI6022. This is already mandatory in several European countries.
  • Durable, non-stick inorganic media with silver ion impregnation for added protection against micro-organisms.
  • Industry-leading efficiency with low air pressure drop.
  • All components are DIN-ISO 846 certified.
  • Systems are designed to eliminate droplet carryover.
  • Low maintenance requirements. To facilitate maintenance and cleaning, media packs are supplied in removable stainless steel cassettes that can be removed from the front or side of the unit.
  • DLL selection and sizing software available for OEM AHU manufacturers.
  • Durable system design for long service life.
  • Suitable for any type of water, such as potable, softened, deionised and RO water.
  • Competitive prices and good delivery times.

Application References

  • OMIA 
  • AirBus 
  • Alstom 

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