Cooling condenses lots of water.
Air compressor line cooler.
Aftercoolers reduce the amount of water vapor in a compressed air system by condensing the water vapor into liquid form.
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In small air systems 20 hp it s common to see the receiver tank used to separate and collect liquids.
If the temperature at the discharge port exceeds 300 degrees fahrenheit the refrigerant oil and adjacent mechanisms.
Post cooling all that water is still in the air line.
Aftercoolers are heat exchangers for cooling the discharge from a air compressor.
The compressed air travels through either the spiral finned tube coil or a plate fin coil design of the aftercooler while ambient air is forced over the cooler by a motor driven fan.
In a reciprocating air compressor for example the air temperature will drop anywhere from 50 degrees fahrenheit to 75 degrees fahrenheit across the roughly six inches of travel between the discharge port and discharge line.
This fellow measured his compressor outlet.
They use either air or water and are an effective means of removing moisture from compressed air.
Air cooled aftercoolers use ambient air to cool the hot compressed air.
Make no mistake a cooler alone does not yield high quality compressed air.
Removing the liquid requires a moisture separator and a drain valve.