Water Cooled After Cooler
A water cooled aftercooler is a tube-in-shell arrangement whereby compressed air heat is exchanged with the cooled water. If sized correctly, the compressed air temperature can be cooled to within 5°C of the cooled water supply (if the chilled water is at 5°C, the compressed air temperature can be cooled to within 10°C, achieving a relatively cheap low dew point). This after cooler takes up little space, can be fitted vertically or horizontally, almost entirely maintenance free and does not use electrical power.