Difference between revisions of "Refrigerated Dryers"

[[File:Refrigerated_Dryers_2.jpg|right|thumb|200px|Refrigerated Dryers 2]]

The '''Refrigerated Dryers''' are designed for installations where pipeline temperatures are not expected to go below 35°F.

These  dryers cool compressed air by mechanical refrigeration, removing the  moisture and assuring that none condenses downstream, unless the air is  exposed to lower temperatures.

===Function===

Refrigeration dryers employ two heat exchangers,  one for air-to-air and  one for air to refrigeration. However, there is  also a single heat  exchanger that combines both functions. The compressors used in this  type of dryer are usually of the hermetic type and the most common gas  used is R-134a. The goal of having two  heat exchangers is that the cold outgoing air  cools down the hot  incoming air and reduces the size of compressor  required. At the same  time the increase in the temperature of outgoing  air prevents  re-condensation.

Some manufacturers are marketing compressors with built in  refrigeration dryers, but these have had a mixed acceptance in the  market.

Commonly a coalesing prefilter is installed immediately upstream of a  refrigerated dryer to remove lubricating oil and other contaminants  that have the potential to foul the dryer's heat exchangers.

===Classification===

There are several types of Refrigerated Dryers exist in the global market. These are:

* Cycling Regrigerated Air Dryers

* Non-Cycling Refrigerated Air Dryers

* High Inlet Temperature Refrigerated Air Dryers

==Cycling Regrigerated Air Dryers==

It will increase or decrease the refrigeration compressor load depending on  the compressed air demands. These dryers will help save money by  reducing power consumption while constantly providing consistent dew  points.

==Non-Cycling Refrigerated Air Dryers==

These are extremely reliable. Non-Cycling dryers can be sized for any  application, and will always provide consistent dew points. They also  have very low maintenance costs.

==High Inlet Temperature Refrigerated Air Dryers==

These are used in situations where extra refrigeration is needed to remove any  water vapor from the air. These dryers are very similar to the  non-cycling dryers, but they are oversized to ensure consistent dew  points.

==Video==

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