Air Cooled type:
This type of compressors has fins cast as part of the cylinder to dissipate some of the heat generated by the compression of the gas. In some compressors vanes are cast as part of the flywheel or sheave to act as fan to help remove the heat from the cylinder surface. This type of cylinder cooling is used in small portable compressors.
Water-cooled type:
Water-cooled compressors are most common in industry. It is impossible to sustain cooling with air in big compressors where heat generation is very high. Water jackets are cast as part of the cylinder. Water is circulated in the cylinder jacket from external source.
In some case the cylinder jacket temperature is to be maintained few degrees higher than the process gas temperature to avoid condensation during standstill, this is possible with water-cooled cylinders by maintaining the water temperature with use of heaters.
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