Collection: Non-Cycling Refrigerated Air Dryers

A non-cycling dryer runs its refrigeration compressor continuously, which means it draws the same power at 10 percent load as it does at full load. That one behavior is both why it is the cheapest refrigerated dryer to buy and the reason it is not always the cheapest to own.

The mechanics are simple. Compressed air passes through a heat exchanger, the refrigeration circuit cools it to roughly 35 to 40 degrees F, water that can no longer stay in vapor condenses out, and a drain dumps it. A hot gas bypass valve holds the evaporator just above freezing so condensate never ices up inside the exchanger. Because nothing cycles, dew point does not swing when demand changes, which is the advantage most people underrate.

When to buy the other kind

If the dryer will sit powered up through two or three shifts while the compressor loafs at partial load, that flat power draw works against you and a cycling thermal mass dryer will pay back the price difference. The dividing line is run hours more than flow. A shop running a few hours a day is fine on non-cycling at any size. A plant running around the clock at 40 percent load is not. We put real numbers to it in cycling vs non-cycling.

The harder limit is dew point. No refrigerated dryer, cycling or not, goes below freezing. Outdoor lines, unheated buildings and anything specifying a sub-freezing dew point need a desiccant dryer instead, and no amount of oversizing here gets you there.