The Solar-AC FAQ : (Category) Heat-driven cooling – absorption, desiccants, Vuilleumier : (Answer) What are desiccant wheels?
A desiccant dehumidifier uses a drying agent to remove water from the air being used to condition building space. Desiccants can work in concert with chillers or conventional air conditioning systems to significantly increase energy system efficiency by allowing chillers to cool low-moisture air. Desiccants can run off the ?waste? heat from distributed generation technologies, with system efficiency approaching 80 percent in cooling, heating, and power (CHP) mode. The desiccant process involves exposing the desiccant material (such as silica gel, activated alumina, lithium chloride salt, and molecular sieves) to a high relative humidity air stream? allowing it to attract and retain some of the water vapor?and then to a lower relative humidity air stream, which draws the retained moisture from the desiccant. In some applications, desiccants can cut cooling loads and peak demand by as much as 50 percent, with significant cost savings. In stand-alone operations, a solid (dry) desiccant re
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