A device in an engine or compressor system that removes excess heat from air or gas after it has been compressed.
From 'after' + 'cooler' (from Old English 'col' meaning cool). Modern technical term developed in the 19th century as industrial machinery became more complex.
Diesel truck drivers know this well—the aftercooler is what keeps compressed air from getting so hot it damages an engine, and it's one reason semi-trucks are so efficient at hauling heavy loads.
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