"Charge-Air Cooler", is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged(forced induction) internal combustion engines to improve their volumetric efficiency by increasing intake air-charge density through isochoric cooling. A decrease in air intake temperature provides a denser intake charge to the engine and allows more air and fuel to be combusted per engine cycle, increasing the output of the engine.
A charge-air cooler increases the efficiency of the induction system by reducing induction air heat created by the supercharger or turbocharger and promoting more thorough combustion. This removes the heat of compression(i.e., the temperature rise) that occurs in any gas when it's pressure is raised or its unit mass per unit volume(density) is increased.
A decrease in intake air charge temperature sustains use of a more dense intake charge into the engine, as a result of forced induction. The lowering of the intake charge air temperature also eliminates the danger of pre-detonation(knock) of the fuel/air charge prior to timed spark ignition . This preserves the benefits of more fuel/air burn per engine cycle, increasing the output of the engine.
Charge-Air Coolers also eliminate the need for using the wasteful method of lowering intake charge temperature by the injection of excess fuel into the cylinders' air induction chambers, to cool the intake air charge, prior to its flowing into the cylinders. This wasteful practice (when intercooler are not used) nearly eliminated the gain in engine efficiency from forced induction, but was necessitated by the greater need to prevent at all costs the engine damage that pre detonation engine knocking causes.
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