The four main types of compressed air dryers are refrigeration, chemical, drying, and membrane. It is important to understand how each drying technology works to find out which one is best for your application.
A refrigerated air dryer cools the air to a low temperature and condenses most of the moisture. With refrigeration dryers, it is impossible to achieve sub-zero dew points. You can also look for the refrigerated air dryers through the web.
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The optimally cooled dryer can produce air with a dew point as low as 2 ° C. Because little moisture remains in the water, this dryer should not be used for applications that are sensitive to water.
The dryer dries the compressed air in the dryer layer which absorbs water vapor molecules. When the bed capacity is almost saturated, the airflow through the dryer is diverted to the second bed.
A timer or device for monitoring the dew point can be used to control the regeneration phase. Dryers can dispense air at a consistently low dew point, typically -40 ° F / ° C or less. This technology is a good choice when compressed air is exposed to freezing conditions.
There are two types of dryers for drying: heated and heatless. Preheated dryers use heat to remove moisture from the dryer that is not being used at this point in the cycle