Especially in modern buildings with small capacity of humidity storage it is necessary to reduce the humidity in the supply air. Normally this was done by using a refrigeration system mostly with CFC's. There are some alternative fluids available, but mostly they show a high global warming potential. All these systems need electrical energy to be driven and therefore it is necessary to consider other possibilities with alternative systems. The most promising systems are sorptive systems that are used now in open cycles.
Two factors - CO2 emissions fiom heating and cooling systems and restrictions on the use of CFC refrigerants - have accelerated the development and introduction of new and more environmentally friendly cooling systems. These new cooling systems also include the so-called "Desiccant Cooling Systems (DCS)" [1]. The desiccant cooling systems consist of a rotating dehumidifier, a rotating heat exchanger and evaporative coolers. For design, control and operation of desiccant cooling systems new criteria have to be considered because of the specific properties of these new technologies.
Ventilation codes for swimming pools are based on preventing condensation. To save energy, air recycle with dehumidification is common. This successfully controls moisttke, but does not remove airborne contaminants arising from evaporation of chemically treated pool water. This contamination may cause discomfort, irritation or even harm.
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