HUMIDITY CONTROL
The benefits of hiring dehumidification
High humidity levels and seasonal temperatures can cause condensation and corrosion. This can create major problems for buildings and critical assets and equipment from construction and FM to marine and manufacturing. Chris Smith, head of temperature control for Aggreko Northern Europe, discusses the role of dehumidifi cation hire equipment.
F
ailure to tackle excessive moisture problems can lead to mould and oxidation. This can cause deterioration of structures and equipment, including high value assets such as ships, nuclear reactors and priceless museum artefacts.
Applications Dehumidifi ers can be used for many applications, including: ■ Drying-out water or fl ood damaged buildings, eliminating the need to replace and reconstruct.
■ Developing stable environments for exposed metal to prevent corrosion, such as preventing oxidation of metal on ships.
■ Reducing drying times at construction sites for concrete, insulation, and fi reproofi ng.
■ Preparing surfaces and vessels for painting and coating applications.
■ Blanketing equipment to protect from humid air.
■ Maintaining correct ambient conditions for laying of fl ooring.
■ Preventing mould and fungus growth. 46 September 2017
■ Preserving equipment on cold stacked off shore rigs.
■ Controlling moisture during nuclear decommissioning to preserve expensive parts, such as rotary turbines, in perfect condition for resale.
■ Preserving expensive assets or perishable goods to maintain them in optimum condition.
■ Controlling the dew point of sensitive areas in museums.
Hiring
Hiring dehumidifi cation equipment can provide a cost eff ective response to moisture control that avoids capital expense.
This can provide a short-term or longer-term solution and a fl exible, portable approach that can be scaled up and down to meet changing project needs.
Technologies can be swiftly deployed to respond to emergencies and prevent damage to critical assets.
Renting equipment means that customers benefi t from the latest specialist technology and
removes the servicing and maintenance risk and cost burden. With all ancillary equipment, spares, servicing and maintenance included, customers can budget accurately, with no hidden costs.
Dessicant
A desiccant material naturally absorbs and retains moisture from both gases and liquids, which can be released again when heated. There are various types of desiccant materials, but at Aggreko we use silica gel as the desiccant within the dehumidifi er drying wheels. These regenerative, desiccant-based dehumidifi ers provide dried, fi ltered, pressurised air that serves many useful functions at manufacturing sites, on construction projects or for other applications.
Each silica granule is made up of a network of interconnecting microscopic pores, which attract and hold moisture via capillary condensation. The trapped moisture is released when heated, enabling the dessicant to ‘regenerate’ itself and be used again and again.
As low ambient temperatures do not restrict the material, silica gel ensures that desiccant
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