ACADEMY SERIES · EPISODE 10Steam Humidification
Steam Distribution & Absorption Distance
In steam humidification, producing the steam is only half the job; the other half is delivering it into the duct air at the right point and in the right way. When the air slows to 1 metre per second, the final humidity reaches 86% and the steam cloud stretches along the duct. This episode covers the distribution pipe, the absorption distance and what drives it, where the distributor belongs in the air handling unit, the high-limit sensor, and the rules for the steam hose and condensate line.
Published: 8 October 2026Narration: Turkish and English6:05
In this video
- The white cloud in front of the distributor is not water vapour but micron-sized droplets; the distance to the point where it fully disappears is the absorption distance.
- Absorption distance depends most on the RH after humidification: with 20 kg of steam per hour in the same duct, final humidity is about 52% at 4 m/s air velocity but 86% at 1 m/s.
- The most effective way to shorten the distance is to divide the steam across several tubes; according to Neptronic, it is under 1.5 metres for the S.A.M. and S.A.M.E2 and under 1 metre for the multi-tube Multi-Steam.
- The distributor goes after the heating and cooling coils, and no bend, damper, filter, coil or sensor sits within the absorption distance.
- Flexible steam hose is limited to 5 metres in total, sloped at least 2% on falling and 15% on rising sections; for 1,000 Pa of duct pressure the condensate trap needs about 15 cm of height.
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