Desiccant dehumidifiers

Unlike most suppliers, the Dantherm Group product ranges include both refrigerant AND desiccant drying equipment. With products that span both technologies, we can offer impartial advice that provides a solution specifically suited for your application.

The air to be dehumidified (process air), passes through a slowly rotating silica gel rotor. The desiccant material attracts the moisture to its surface, removing it from the air stream (dry air). A second, smaller air stream (reactivation air) usually heated to around 120°C, is required to remove the moisture from the rotor. This (wet) air must then be exhausted to atmosphere using a duct. Slowly rotating the rotor through both airstreams creates a continuous dehumidification process.

Advantages:

• High moisture removal rate in a single air pass
• Can achieve very low absolute humidity levels
• Can work in low temperatures
• Can work in very low humidity

Disadvantages:

• High energy consumption
• Low specific moisture extraction (kg/kWh)
• Ducting from/to outside for reactivation air and wet air
• High rotor replacement costs

Where used:

Generally, where a very low relative humidity or absolute humidity is required, and/or where the operating temp is below 3°C.

• Pharmaceutical
• Food
• Confectionery
• Specialist manufacturing that requires very low RH
• Low temp storage and freezer rooms

Where not used:

• Recirculation applications that require RH above 40%
• Applications that are sensitive to high supply air temperature
• Swimming pools
• Sites with limited power supply (unless mains gas or steam reactivation is available)
• Areas that have no access to outside walls

Associated products