Engineering · Diesel — Charge Air Cooling
An air cooler (intercooler/aftercooler) is fitted after the turbocharger primarily to:
- AHeat the charge air for better combustion
- BFilter water from the air
- CIncrease the density (mass) of the charge air so more fuel can be burned✓ Correct
- DReduce exhaust back pressure
Explanation
Compressing air raises its temperature and lowers its density. Cooling the charge air after the turbocharger increases its density, packing more oxygen mass into the cylinder so more fuel can be burned for greater power output.
Authority: Modern Marine Engineer's Manual
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