One of the most widely used pieces of equipment to dry compressed air is a refrigerant air dryer. You can categorize this as either a non-cycling or as variable speed drive.

As you understand by the name, a refrigerant dryer is designed to cool the compressed air. This is how the water inside the compressed air starts condensing and this helps to separate from the air itself.This is a very important air system component required for applications that utilizes compressed air dried to a low dew point. In the first stage, compressed air gets into the dryer and passes through an air to air heat exchanger, thus the incoming air pre-cools. In the second stage, compressed air starts passing through an air to refrigerant heat exchanger to reduce the compressed air dew point, typically to 3°C / 37°F.

Water turns into vapor inside the air and condenses into liquid. This liquid is trapped and removed. The dry air then gets heated up in the air to air heat exchanger to reduce the relative humidity in the air. This is a preventive for condensation to form in downstream piping. 244 Cfm Refrigerated Air Dryer is one ideal example.

Advantages of Refrigerant Dryers
Low initial capital cost
Comparatively low operating cost
Low maintenance costs
Gets the dew points of 3°C / 37°F

Non-cycling air dryers are used to refrigerate the circuit and function continually. They can even control the temperature by using a hot gas bypass valve and cycling of the evaporator fan that works to maintain a tight temperature range. A cycling refrigerated air dryer reduces the use of energy by cycling on and off in response to demand. These dryers are a bit more costly, they are much more energy-efficient over the period of time.

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