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Charge Air Cooler Effectiveness

ε = (T1 − T2) / (T1 − T_cw) - CAC effectiveness. Modern marine CAC typically 0.70–0.85.

Engine
CAC effectiveness ε
0.906 -
Formula, assumptions, and limits

Shell-and-tube marine CACs 0.70–0.80; plate-fin higher 0.80–0.88. Falling ε with unchanged inlet conditions = fouling on the air-side (sootballs) or water-side (salt-scale) - clean or chemical-treat.

Symbol legend

SymbolMeaningUnitSource
Air after compressor°Cturbocharger
Air after CAC°CCAC outlet
CW inlet to CAC°CCW pump outlet