← Back to Technical Tools
TECHNICAL TOOL / 04
Dehumidification technology route comparison
Compare the first technology path before discussing capacity or model. The tool calculates the inlet and target dew points, then shows which route deserves first review and which project conditions still need confirmation.
PRE-SCREENING RESULT
Route to review first —
—
- Inlet dew / frost point
- —
- Target dew / frost point
- —
- Required dew-point reduction
- —
Why this route appears first
Design implications
Information still needed
ROUTE COMPARISON
Read the result as a starting order, not a final equipment decision
Refrigerant dehumidification
Cooling removes moisture as condensate. It is commonly the first route for moderate dew-point targets and warmer operating conditions.
View refrigerant equipment →Desiccant rotor dehumidification
A regenerated desiccant rotor can reach lower outlet moisture levels and continue drying where a cooling coil becomes impractical.
View desiccant equipment →Staged refrigerant + desiccant
A cooling stage can remove the higher inlet moisture load before a desiccant stage completes lower-dew-point drying.
Compare both product families →DECISION METHOD
The target dew point sets the first boundary
ASHRAE describes mechanical dehumidification as typical for dew points of roughly 1.7–4.4°C and above, while lower requirements move the review toward desiccant methods. It also notes that some applications below about 7°C can benefit from mechanical first-stage drying followed by desiccant final-stage drying.
Refrigerant-led review
Start with refrigerant dehumidification, then verify capacity at the actual lowest temperature and moisture load.
Transition range
Compare desiccant and staged routes. A high incoming or internally generated moisture load increases the value of a refrigerant first stage.
Desiccant-led review
Start with a desiccant route. Compare a staged first section when the inlet air carries a high moisture load.
PROJECT REVIEW
Turn the route into an equipment requirement
Share the room or enclosure, operating range, target, moisture sources, airflow, installation, power, drainage, controls, quantity, and duty cycle. Capacity and model selection begin after those conditions are defined.
Discuss the operating conditions