Dehumidification - Removing Moisture from Air

Calculator for air dehumidification methods including cooling (vapor condensation), adsorption (silica gel and activated alumina), and absorption of water vapor.

Dehumidification Methods

Air can be dehumidified through three main methods:

Cooling - Condensation of vapor by cooling air below dew point
Adsorption - Using materials like silica gel or activated alumina to hold moisture on their surface
Absorption - Using absorbent materials like calcium chloride solution

Select the method below to calculate dehumidification parameters.

Calculator

Inputs

Dehumidification Method

Air Mass (kg)

Initial Absolute Humidity (g/kg)

Final Absolute Humidity (g/kg)

Adsorbent Material Mass (kg)

Reactivation Temperature (°C)

Specific Heat of Adsorbent (kJ/kgK)

Results

Moisture Removed from Air-- kg

Moisture Reduction-- %

Adsorbent Capacity Utilized (Silica Gel)-- %

Heat Required for Reactivation-- kJ

Temperature Rise of Adsorbent (for reactivation energy)-- K

Adsorbent Material Properties

Silica Gel (SiO₂)

Adsorption Capacity: 40% of its own mass
Bulk Density: 480 - 720 kg/m³
Void Volume: 50 - 70% by volume
Specific Heat: 1.13 kJ/kgK
Reactivation Temp: 160 - 170°C
Reactivation Heat: 4800 kJ/kg water removed

Activated Alumina (Al₂O₃)

Adsorption Capacity: 60% of its own mass
Bulk Density: 800 - 870 kg/m³
Void Volume: 50 - 70% by volume
Specific Heat: 1.0 kJ/kgK
Reactivation Temp: 160 - 170°C
Reactivation Heat: 4800 kJ/kg water removed