Humidification technologies in comparison

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Different systems and technologies are used in practice to ensure sufficient air humidity: Nozzle atomizers, steam humidifiers, ultrasonic atomizers and evaporators are frequently used functional principles, which are applied in central humidification as well as in direct room humidification. Condair Systems specializes in direct humidification and mainly uses nozzle systems with high prere and compressed air technology. The various systems differ in terms of energy consumption, maintenance requirements and humidification performance.

1. In nozzle humidification, a distinction is made between high-prere-. Compressed air nozzle vaporizers distinguished.

In high-prere nozzle humidification, water is put under high prere (85 bar) by a high-prere pump. Water is transported directly to the humidifiers via high-prere hoses (single-substance process). It is then atomized microfine and almost noiselessly via special high-prere nozzles. High-prere nozzle atomizers also consist of a control unit. Ame the use of a water treatment system.

Microfine nebulization

Large humidification capacity possible

Low energy consumption

The water is nebulized in these nozzle systems by means of compressed air (compressor). Compressed air and water are fed separately into the humidifiers (two-substance process). This technology, which has proven itself over many years, is particularly economical for smaller production rooms (up to approx. 4.000 m 3 ) and suitable for applications with lower droplet size and operating noise requirements.

Robust technology

Simple installation

Problem-free expansion

2. Steam humidifier Vaporizers produce steam in a temperature-resistant plastic or stainless steel cylinder in which the humidifier water is heated to 100 °C. Steam humidifiers are divided into three types: Electrode, resistance and gas evaporators. The heating in the frequently used electrode and resistance evaporators is carried out by electrical energy, which is why the electrical power consumption is quite high.

Rating: The steam humidifiers have a quiet operation, but high energy consumption. The service life of the steam cylinders is limited due to lime deposits.

3. Ultrasonic humidifier In ultrasonic humidification, the water is excited to high-frequency oscillations by piezoelectric oscillator elements, causing water aerosols to emerge from the water surface in the form of a cold mist. The resulting aerosol is carried into the room air by an air stream.

Evaluation: Advantages of the ultrasonic humidifiers are the low energy consumption and the noiseless and drip-free mode of operation. The service life of the ultrasonic transducers is limited, so a corresponding spare parts requirement must be planned for. Fully demineralized water is required for operation.

4. Evaporator In the case of evaporators, the humidifier water is evenly distributed on a contact body or the contact body is soaked to create a large surface area for the evaporation process. A fan conveys the room air through the contact body. The humidification process takes place by evaporation on the surface of the contact body. Stationary equipment is connected to the water network. The contact body can be of fixed or rotating design.

Assessment: The evaporators have only a low electrical energy requirement. Cleaning and maintenance work must be carried out regularly to prevent limescale deposits and the formation of a biofilm. Water should be changed daily.

5. Small mobile devices According to VDI 6022 Sheet 6, the use of small mobile devices at workplaces is prohibited for preventive reasons; unless the user provides verifiable proof of safe operation.

Also, all decoratively water-operated devices (z.B. Water walls, fountains) pose a high risk of respiratory exposure from contaminated water if not properly charged, cleaned and maintained. Special tests and measures are therefore necessary for hazard-free operation.

Evaluation of humidification systems When comparing the various humidification systems, the operating costs, the technical equipment and the services offered must be compared in detail. In the interest of high health protection and comprehensive operational safety, systems with integrated water treatment and a sustainable maintenance concept are to be preferred.

The VDI certificate is an important decision-making aid when choosing the right humidification system. The user of such a checked system has the security to operate a maintenance-friendly, economical and hygienically perfect system.

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