Core difference from steam?

Steam is isothermal, temperature constant, humidity rises. Adiabatic is isenthalpic, temperature drops (-5/-12°C), humidity rises, enthalpy constant.

Which sub-technologies?

Three families: SKH high-pressure atomisation (70-100 bar, 5-10 µm), SKV evaporative humidifier (AHU media), SKVF standalone evaporative cooler.

Adiabatic 50-100 W/kg, steam ≈ 750 W/kg. Factor 8-15×. 150 kg/h × 8,000 h/year ≈ €100,000 annual saving.

Latent heat 0.68 kWh/kg cooling equivalent. 200 kg/h ≈ 136 kW free cooling. Summer chiller load drops 20-30%.

Water quality requirements?

RO + UV + tank circulation + Ag-ion antibacterial cartridge + VDI 6022 compliance is standard.

Which applications unsuitable?

Pharma cleanroom, hospital OR, ICH stability, semiconductor (ISO 5 and below), museum collections. These require steam.

Why droplet size matters?

Evaporation time scales with squared diameter. 5 µm ~0.2 s, 50 µm ~20 s. Target <10 µm + ceiling ≥4 m → no wet floor.

5,000 m² × 150 kg/h × 8,000 h/year: Steam 10-year €1.1M, adiabatic €0M (net saving €50K). Difference ~€1M, payback 4-6 months.

Six steps: site analysis, humidification-load calculation, technology matching, RO+UV, control strategy, commissioning + 6-month validation.

Engineering Reference31 min read

What Is Adiabatic Humidification? How It Differs from Steam Humidification

Q: What is adiabatic humidification?

A technology that raises humidity by atomising water into micro-droplets or evaporating it from a wetted surface. Evaporation energy is drawn from the air; the process is isenthalpic.

Q: Textile TCO?

5,000 m² × 150 kg/h × 8,000 h/year: Steam 10-year €1.1M, adiabatic €0M (net saving €50K). Difference ~€1M, payback 4-6 months.

Q: NKT project flow?

Six steps: site analysis, humidification-load calculation, technology matching, RO+UV, control strategy, commissioning + 6-month validation.

Adiabatic humidification raises humidity by atomising water or evaporating it from a wetted surface, an isenthalpic process that cools by drawing heat from the air. Thermodynamic difference from steam, three technology families (SKH/SKV/SKVF) and application matching.

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Related Glossary Terms

For deeper definitions of the technical concepts in this article, browse the related entries in the NKT Glossary:

Relative Humidity (RH)Absolute Humidity Psychrometric Chart Dry Bulb Temperature Wet Bulb Temperature Enthalpy Sensible Heat Latent Heat Cleanroom HVAC (Heating, Ventilation & Air Conditioning)GMP (Good Manufacturing Practice)TCO (Total Cost of Ownership)ACH (Air Changes per Hour)Steam Humidification Adiabatic Humidification Water Hardness (Fr° / ppm CaCO₃)Reverse Osmosis (RO/DI) Water Humidification Capacity (kg/h)Scaling (Scale Formation)Evaporative Humidification High-Pressure Misting Nozzle (Atomisation Orifice)Droplet Size Evaporative Cooling (Adiabatic Cooling)Legionella (Legionella pneumophila)Filtration (Water Filtration)UV Disinfection (Ultraviolet Sterilisation)Stagnant Water Biofilm Modulation (Capacity Modulation)Water Treatment

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