From wineries and museums, through color stations and cold rooms for agricultural produce, to server farms and defense industries—air humidification has many customers, from preventing wine evaporation to preventing static electricity. Air humidification is designed for a wide range of purposes, so how do we know which technology to choose?
Air humidification technology is used in various industries for a wide range of applications.
It is required in the defense industry, printing, the textile industry, agricultural crops, and even in wineries and museums.
The objectives of air humidification vary greatly from place to place, ranging from the comfort of those present at the facility to the prevention of the ignition of sensitive and explosive materials.
There are many air humidification technologies, each with different characteristics, depending on the user's needs. The user must choose wisely according to the suitability of the method's advantages and disadvantages for the required purpose.
The main uses of air humidification are:
- Prevention of static electricity
- Improving and streamlining production processes
- Preventing weight loss in agricultural product storage
- Extended shelf life and visibility
- Preventing drying/evaporation of materials
- Improved comfort
Air humidification is required in various industries for different purposes. For example, in the defense industry, it is required to prevent static electricity that could cause sparks.;
In the printing and paper industry, it is necessary to maintain the flexibility of the paper and printing machines.
In the semiconductor industry, it is required to prevent static electricity that could cause a short circuit.
In the textile and fiber industry – to prevent fiber dispersion, settling of floats
In the pharmaceutical industry and hospitals – to prevent drugs from drying out
In automotive and furniture coatings – for better adhesion of the paint to the product
In museums – to preserve the quality of paintings
In server farms – to prevent static electricity from damaging servers
In factories and multi-story buildings – to increase work comfort and prevent absenteeism
In wineries – to prevent evaporation of wine from wooden aging barrels
Cold storage rooms for agricultural produce – to prevent weight loss and extend shelf life
In agricultural crops—such as cannabis and mushrooms—to prevent dehydration
Tobacco and cotton storage—maintaining flexibility and adding weight.
Table 1 shows the different characteristics of the wetting agents, which are classified according to droplet size, qualitative comparison, and particle fall time.
Key technologies
There are two main methods of air humidification – isothermal and adiabatic. Each of these has several sub-methods.
There are three types of moisturizers in isothermal technology.
- Air: Humidifies air with steam electrodes;
- Steam humidifier Electric heating elements;
- Steam humidifier Heating with gas
There are also three types of adiabatic technology:
- Ultrasonic air humidifier;
- Humidifies air using compressed air;
- High-pressure air humidifier.
The isothermal method allows the air to be humidified using steam. The isothermal air humidifier:
Produces high-quality mist with a droplet size of 0.01-1 micron. The absorption distance is short – 30-50 cm, and it produces humidity at 100°C – sterilized mist. With this method, control is proportional and accuracy is high.
In addition, the device is easy to install by a contractor or customer in the room or in the basement. The mist is produced at a rate of up to 120 liters per hour. Operating costs can also be reduced with gas heating, and the device is available in a water-resistant IP 65 enclosure.
However, its dispersion is limited, it heats up, and it consumes a lot of energy, requiring 0.7 kW for 1 kW of output.
The diabetic method performs the operation by producing dry mist without wetting:
With a droplet size of 5-10 microns. It has a cooling effect and negligible compressor energy consumption, along with low maintenance requirements. It has independent dispersion capability and is manufactured in capacities of up to 350 liters/hour. Its control is binary and its accuracy is moderate.,
It can be installed in the room or in the basement. However, it is noisy, installation is complex and requires a technician, it requires the use of an air compressor, and the absorption distance is long – about four meters.
This method also uses ultrasonic air humidifiers. Their advantages are:
- Produces high-quality vapor. Droplet size 2-5 microns.
- Short adsorption distance of 30-50 cm.
- Adiabatic – produces a cooling effect.
- Manufactured in capacities up to 50 liters/hour.
- Proportional control. High precision.
- Easy to install – can be installed by a contractor or the customer.
- Can be installed in the room or in the attic.
- Some models include a UV lamp for water disinfection.
However, dispersion and flow rate are limited, and some models have standing water.
Adiabatic air humidifier with high water pressure technology:
- Produces wet mist. Droplet size 10-30 microns.
- Negligible energy consumption.
- Adiabatic – produces a cooling effect.
- Binary control. Moderate accuracy.
- Produced in very high capacities of 100 to 1,500 liters/hour.
- Can be installed in the room or in the attic.
Its disadvantages are that it is noisy and not suitable for quiet places, installation is complex, requires a technician, and requires a height of five meters in the room and a long absorption distance of two meters.
Tables 2 and 3 summarize the various characteristics of the different wetting agents, which influence the considerations in selecting the preferred technology.
