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