ACADEMY SERIES · EPISODE 1Psychrometrics & Sizing

Moisture Load Calculation

Selecting an industrial dehumidifier starts with an accurate moisture load calculation. This episode walks through the seven moisture sources, a worked infiltration example and how the target dew point drives the choice of technology.

Published: 3 October 2026Narration: Turkish and English4:10

In this video

  • Relative humidity changes with temperature, so moisture load calculations are carried out with the humidity ratio (g/kg dry air).
  • The moisture load of a space comes from seven independent sources: infiltration, planned ventilation, water evaporation, occupants, building diffusion, hygroscopic materials and combustion.
  • In the worked example, a 600 m³ production area with 0.25 air changes per hour and a 4.4 g/kg humidity ratio difference gives an infiltration load of 792 g/h.
  • A safety factor of 15–25% is added to the total; margins above 50% lead to oversizing and short cycling.
  • Above a +12 °C dew point refrigerant dehumidifiers are sufficient; lower targets require silica gel rotor systems, down to a −60 °C dew point.

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