Alfa Laval - Liquid dehumidification

Liquid dehumidification

Each ASHRAE (American Society of Heating, Refrigeration and Air conditioning Engineers) compliant system is a versatile, highly efficient and controllable dehumidification and direct air-cooling system, providing precise and consistent RH control, from 20% to 60%, which meets the most demanding HVAC facility conditions – resulting in lowered operating costs and more energy efficient performance, while removing any bacteria, fungi or viruses that may be present.

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Simultaneous dehumidification and direct air cooling

  • Microbiological decontamination
  • Precise humidity control (+/- 1%RH)
  • Design flexibility
  • Frost free cooling
  • Energy savings; Performance reliability

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How it works

Alfa Laval liquid desiccant dehumidification systems operate on the principle of chemical absorption of water vapor from air. The absorbent solution, Kathene, is a desiccant solution composed of lithium chloride salt and water. Kathene is non-toxic, will not vaporize, and is not degraded by common airborne contaminants.

The ability of Kathene to remove or add water vapor from the air is determined by the temperature and concentration of the solution. The concentration of Kathene can be adjusted to deliver air at any desired relative humidity between 18% and 90%. For a given Kathene concentration, lower solution temperatures enable the conditioner to deliver cooler, dryer air.

The illustration above shows the basic elements of an Alfa Laval liquid desiccant system. In operation, air to be conditioned is cooled and dehumidified by contacting Kathene in the conditioner. By continuously circulating the desiccant through a heat exchanger, energy is extracted from the air and transferred to a coolant. The amount of heat extracted by the Alfa Laval liquid desiccant system is modulated to exactly match the load by controlling coolant flow through the heat exchanger.