An ultrasonic humidifier creates fine water droplets that must evaporate into the air. The rated mist output is therefore not automatically the useful moisture absorbed by a room or duct. Air conditions and distribution determine whether the result is controlled humidity or wet surfaces.
Why a room becomes wet before reaching its target
Cool air close to saturation has limited capacity to absorb additional moisture. A concentrated mist plume may strike a wall, product or floor before evaporation is complete. Increasing output in response to a distant humidity sensor can make that local wetting worse.
Resolve the distribution and absorption conditions first: consider air temperature, airflow, discharge location and the space available before an obstruction. For duct installations, coordinate the humidifier with the air-handling designer and provide the required limiting controls.
Water quality becomes an air-side issue
Dissolved material can remain when atomised droplets evaporate. Select water treatment to the equipment manufacturer's requirements and the process's contamination limits. A clean-looking water supply is not proof of low mineral content or suitable microbiological quality.
CAREL's ultrasonic humidifier manual specifies demineralised water and installation conditions for that equipment. Use the actual supplied unit's water, maintenance and airflow requirements rather than assuming all mist generators have the same limits.
Size for moisture demand, then control it
The load depends on incoming air, exhaust, leakage, room conditions and moisture absorbed or released by the process. Floor area alone is insufficient. A large unit with limited turndown may cycle poorly when demand is small.
Use representative sensor locations and coordinate any high-limit or airflow interlock. Include tank drainage, cleaning access and the operating plan during shutdowns. A mobile cabinet still needs suitable water, power and placement; wheels do not eliminate these requirements.
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