Industrial dehumidifiers remove excess moisture from the air in order to prevent rust, mildew, and damage to electrical components. They also add heat to the area being treated, further reducing the relative humidity of the surrounding air. There are four basic types of industrial dehumidifiers. Air cooled devices force moist air over a cold, dehumidifying coil. The moisture condenses out of the air onto the coil and drains from the coil into a container. Water cooled dehumidifiers derive their name from how they remove excess moisture by circulating cool water through a system of coils and pipes. Industrial dehumidifiers with solid desiccant rotors use ceramic wheels or disks whose surface is covered with a specialized desiccant. Electric or gas-fired heaters are often used remove the trapped condensate from the desiccant. Other removal methods include steam and positive temperature coefficient (PTC) heaters, self-regulating devices that do not contain doped, polycrystalline ceramics. Unlike other industrial dehumidifiers, liquid absorbent devices use substances such as lithium chloride to remove moisture from air.
Selecting industrial dehumidifiers requires an analysis of product specifications. Air volume is the amount of air that passes through the dehumidifier. It is measured as a volume per unit time, such as cubic feet per minute (ft3/min). Moisture removal is the amount of moisture that is removed from air that passes through the dehumidifier. Like air volume, moisture volume is measured as a volume per unit time, but typically in pounds per hour. Relative humidity is a measure of the amount of water in the air compared with the amount of water that the air can hold at the time of measurement. Dew point temperature is the temperature at which air cools at constant pressure in order to reach saturation. Typically, dew point is measured in degrees Fahrenheit (F).
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