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Charge Air Cooler Effectiveness

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

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Formula, assumptions, and limits

ε=T1T2T1Tcw\varepsilon = \frac{T_1 - T_2}{T_1 - T_\text{cw}}
SymbolMeaningUnit
T1T_1Air after compressor°C
T2T_2Air after CAC°C
TcwT_\text{cw}CW inlet to CAC°C

Source: ASHRAE Handbook - Heat Exchangers

In short

\u03b5 = (T1 \u2212 T2) / (T1 \u2212 T_cw) - CAC effectiveness.

Learn the theory Engine Performance Monitoring: PMI Systems