Ultrasonic Humidifiers

Economical made-to-measure ultrasonic humidification

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Upgrade to the latest in technology & maximise energy efficiency. Controlled humidity for data centres – more than 90 % energy saving.

For over 20 years, STULZ has been supplying its Ultrasonic humidifying systems for made-to-measure humidification that ensures the best possible processes and high quality standards.

Room application
Room application
System for direct room humidification
Duct application
Duct application
Humidification system for duct installation
Ultrasonic technology
Ultrasonic technology
Efficient humidification through water atomization
Adiabatic humidification
Adiabatic humidification
Production of cold mist through adiabatic system

Product Overview

At a glance

Most Important Benefits

  • Maximum energy savings: 93 % less electricity than electrode/resistance steam humidifiers
  • Adiabatic Cooling Effect
  • Long service life (stainless steel or high-grade plastic)

    Most Important Features

    • The additional adiabatic cooling effect
    • Approved for a hygienic operation to VDI6022

    Most Important Technical Data

    • Humidifying power (kg/h): 14, 28, & 42 KG/Hr
    Benefits
    • Maximum energy savings: 93 % less electricity than electrode/resistance steam humidifiers
    • The additional adiabatic cooling effect
    • Long service life (stainless steel or high-grade plastic)
    • No cost-intensive replacement of steam cylinders
    • Excellent control characteristics: immediate humidifier capacity
    • Flexible actuation
    • Rapid payback
              Features
              • The additional adiabatic cooling effect
              • Approved for a hygienic operation to VDI6022
              • Energy consumption: approx. 60 W per 1 kg/h of ultrasonic humidifier capacity
              • Ultrasonic cool mist humidifier produces very fine mist (0.001 mm on average), which is immediately assimilated into the air
              • Hygienic humidification thanks to a continual supply of fresh water and special purging/flushing cycles
                    Technical Data
                    Humidifying power (kg/h) 14, 28, & 42 KG/Hr

                    All Details About Ultrasonic Humidifiers

                    Distribution by infinitely adjustable EC fan
                    • Speed-controlled fan
                    • Minimum power consumption
                    • Minimum noise level
                    • Nominal airflow rate at a fan speed optimized for partial load
                    • Increased airflow in each size
                    • The latest motors, electronic processor and impellers
                    • Aerodynamically optimized blades
                    Adiabatic Cooling

                    The water droplets are nebulized so finely in the ultrasonic humidifier that they automatically pass from the liquid to the gas phase (they evaporate). The heat required for evaporation is drawn from the room air, so aiding cooling.

                    Benefits
                    • Very fine mist (0.001 mm or 1 µm), which is immediately assimilated in the air
                    • Rapid payback/future-proof investment given rising energy prices
                    • Long oscillator life: minimum running time based on nameplate power rating is 10,000 operating hours
                    • Energy-saving cooling effect due to physical characteristics
                    • Excellent control characteristics: immediate humidifier capacity
                    • Flexible actuation
                    • Maximum energy savings – 93 % less electricity than electrode/resistance steam humidifiers
                    • Hygienic humidification thanks to a continual supply of fresh water and
                      special purging/flushing cycles
                    Features
                    • Additional adiabatic cooling effect
                    • Approved for hygienic operation to VDI6022
                    • Energy consumption: approx. 60 W per 1 kg/h of humidifier capacity
                    Solutions for Ultra Sonic units
                    • A modular humidifying system for installation in ventilation ducts (UltraSonic ENS) or direct room humidification (UltraSonic BNB) 
                    • The UltraSonic SCA and UltraSonic FN solutions have been developed for pinpoint accuracy in humidification
                    • Typical applications: the print industry, photo laboratories, greenhouses, fruit and vegetable storage, ventilation cabinets, the leather and textile industry, equipment rooms (Data Centers), labs and test rooms
                    Why Humidification is important in Data Centers?

                    Why humidify your mission critical facility?

                    Today's high tech environment requires meticulous control of humidity to eliminate static electricity, ensure quality manufacturing processes, preserve precious documents and works of art, and provide comfort while adhering to Indoor Air Quality standards. The specific reasons to humidify are as numerous as the applications, but the purpose is common across the board: to eliminate problems that can damage products, ruin buildings, or jeopardize health.

                    Ultrasonic Humidification

                    Indoor Air Quality affects man and machine and both operate best at optimum environmental conditions and IAQ and IEC standards are forcing manufacturers and building owners to adjust their management of air quality control. If a building's main HVAC system does not have the capacity to maintain RH levels within a comfort zone of 50% to 60%, then proper humidification can help reduce adverse effects of occupant discomfort, bacteria growth, viruses, fungi, mites, allergic reactions, respiratory infections, chemical interactions and ozone production.

                    Type of Humidification Process

                    The type of humidification process used can make a significant difference in maintenance and operation costs. 

                    Principle of Operations

                    Ultrasonic humidifiers are one of the most environmentally friendly products that can be used in data centers

                    Ultrasonic humidifiers operate according to the principle of "Ultrasonic Atomization".

                    Fig. 1: The humidifier is switched on. The oscillator amplitude is positive.

                    Fig. 2: The oscillator amplitude is negative. The inertia of the water creates a vacuum.

                    Fig. 3: After approx. 10 amplitudes, the ultrasonic humidifier reaches 100 % of its output.

                    A piezoelectric transducer immersed in a water bed, converts a high frequency, electronic signal into a high frequency mechanical oscillation.  As the oscillation speed is increased to a level where the water particles can no longer follow the oscillating surface, a momentary vacuum and strong compression occur, leading to the explosive formation of air bubbles (cavitation).  At cavitation, broken capillary waves are generated, and tiny (1 micron diameter) droplets break the surface tension of the water and are quickly dissipated into the air, taking vapor form and absorbed into the air stream.

                    The principle of ultrasonic humidification is based on the superimposition of two effects:

                    1. Cavitation bubble implosion

                    The change in amplitude of the oscillator gives rise to powerful water hammers that release tiny cavitation bubbles. The implosion of the bubbles on the surface emits tiny water aerosols into the ambient air.

                    2. Capillary wave theory

                    The ultrasonic oscillators generate regularly formed Rayleigh surface waves in the water tank. Minute water aerosols are also emitted into the ambient air on the crests of these waves.

                    By superimposing these two effects, the use of ultrasonic humidifiers enables a homogeneous aerosol mist to be produced with minimal energy consumption.

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