Class 4 (4th Engineer) MEKG 📅 Nov 2022

Exam Question

(a) Sketch and describe a tubular heat exchanger for heating or for cooling air under pressure showing clearly how the unit is arranged in position with any necessary mountings. (10)

(b) How is the flow arrangement designed to obtain the most efficient exchange of heat and what provision is made for thermal expansion? (6)

Reference Answer

### (a) Tubular Heat Exchanger (Charge Air Cooler)
A tubular heat exchanger, such as a main engine charge air cooler, is a critical component used to cool the air after the turbocharger and before it enters the engine cylinders. Cooling the air increases its density, which allows a greater mass of air to be supplied to the cylinder, thereby improving engine power output and thermal efficiency.
#### Construction & Description
The heat exchanger is typically of the shell-and-tube type, with a single-pass or two-pass configuration for the cooling medium (water).

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