CAS Hire Desiccant Dehumidifier

CAS Hire has a range of dehumidifiers for rental and can provide the ideal dehumidification solution for the smaller facilities requiring mould and mildew protection and humidity control.

If you are looking for a rugged, lightweight but high performance dehumidifier look no further. These dryers utilise desiccant technology which enables them to continue to remove moisture down to and below freezing and 30% relative humidity.

Perfect for:

  • Offices
  • Laboratories
  • Medical
  • Shops
  • Food Industry
  • Warehouses
  • Pharmaceutical
  • Defence Industry
  • Hotels
  • Cold stores
  • Basements
  • De-flooding
  • Factories
  • Agriculture
  • Stadia

What is a desiccant dehumidifier and how does it work?

desiccant dehumidifier hire
Desiccant dehumidifiers / dryers use desiccant material (such as silica gel) in a ‘rotor’ form to absorb moisture. Rotors are made from layers of corrugated sheets infused with the active desiccant material. Damp air known as (Process Air) is drawn into the dehumidifier, where is passes over a wheel infused with the desiccant material / silica gel.

This allows for large amounts of axial air channels running parallel through the rotor. As the moist air filters through these channels, moisture is transferred between the air and the desiccant material before leaving the dehumidifier as warm dry air.

The desiccant material / silica gel wheel is continually rotating, typically at three revolutions per hour. As the wheel rotates a small portion passes through the regeneration segment. During this phase a second air stream (Regeneration Air) is heated to a high temperature before passing over the wheel. Any moisture present in the wheel is released into this air stream, this hot wet air is then exhausted outside the area being dried.

Desiccant dehumidifiers / dryers do not rely purely on cooling the air to extract the moisture, they’re known to operate and perform well when used in colder temperatures. As there is no water (only hot wet air) produced during the drying process, the units can perform efficiently at well below 0 deg Celsius. If drying moist air for industrial applications, both pre-cooling (damp humid air removed as condensation) and a desiccant rotor (damp humid air removed by absorption) in the same air system is a regular system used in the workplace.

If you need further information about desiccant dehumidifiers visit our FAQs page.