Exam Question
(a) What is function of charge air cooler on 2-Stroke Diesel Engine (4)
(b) Draw diagrammatic sketch of charge air cooler. Describe each part (8)
(c) How the efficiency of charge air cooler can be checked? (4)
Class 4 (4th Engineer)
MEKM
📅 Jul 2023
Reference Answer
### (a) Function of a Charge Air Cooler (Intercooler) on a 2-Stroke Diesel Engine
The primary function of a Charge Air Cooler is to increase the density of the air supplied to the engine cylinders after it has been compressed by the turbocharger. This is achieved by cooling the hot, compressed air using a heat exchanger, typically with LT (Low Temperature) Central Cooling Water as the cooling medium.
This function serves several critical purposes:
1. **Increased Power Output**: According to the Ideal Gas Law ($$PV=nRT$$), cooling the air at a constant pressure significantly increases its density ($$\rho = \frac{m}{V}$$). This allows a greater mass of oxygen to be delivered to the cylinders for a given swept volume, enabling more fuel to be burnt completely. This results in a higher mean effective pressure and consequently, a greater power output from the engine.
The primary function of a Charge Air Cooler is to increase the density of the air supplied to the engine cylinders after it has been compressed by the turbocharger. This is achieved by cooling the hot, compressed air using a heat exchanger, typically with LT (Low Temperature) Central Cooling Water as the cooling medium.
This function serves several critical purposes:
1. **Increased Power Output**: According to the Ideal Gas Law ($$PV=nRT$$), cooling the air at a constant pressure significantly increases its density ($$\rho = \frac{m}{V}$$). This allows a greater mass of oxygen to be delivered to the cylinders for a given swept volume, enabling more fuel to be burnt completely. This results in a higher mean effective pressure and consequently, a greater power output from the engine.
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