Aftercoolers in compressed-air systems: primary purpose. Identify what an aftercooler accomplishes downstream of compression to prepare air for distribution/use.

Concept/ApproachAn aftercooler cools compressed air, condensing water vapour (and some oil vapour), so that liquids can be separated before the air enters receivers/distribution. While it does cool the air, the key functional purpose is to condense and remove moisture and oil.

Option checkC is the most specific and accurate statement of purpose.D is true but incomplete: cooling is the means, not the end, in air-system conditioning.

Final Answercause moisture and oil vapour to drop out.