Air Cooled Heat Exchanger Structure and Fin Tubes Applied

As we all know, the air cooled exchangers consist of a finned tube bundle with rectangular box headers on both end of the tubes. Cooling air is provided by one or more fans and usually air blows upwards through a horizontal tube bundle. It's general structure is as below drawing shows.

It's operating principle is like this.

Usually the fin tubes used in fin fan cooler is Embedded, Extruded, Footed and Externally bonded, with Fin density (FPI) – 7 to 16; Fin height – 3/8 inch to 5/8 inch and Fin thickness – 0.012 to 0.02 inch.