🔍 Key Concepts

• Heat transfer in an aftercooler (how fouling affects cooling efficiency) • Difference between air side fouling vs water side fouling • Relationship between temperature differential and pressure differential across the cooler

💭 Think About

• If the air passages on the cooler become dirty or blocked, what happens to the air’s ability to give up heat to the cooling water? • How would reduced heat transfer on the air side show up when you compare inlet and outlet air temperatures? • Would air side fouling primarily change pressure drop, temperature change, or both—and which effect is the most direct indicator?

✅ Before You Answer

• Compare what an increased vs decreased air temperature differential really means physically. • Decide which option best reflects reduced heat transfer on the air side, not restricted water flow. • Ask yourself whether pressure differential is the main sign of fouling, or a secondary effect compared to temperature change.