Class 2 (2nd Engineer) MEP 📅 Aug 2024

Exam Question

(a) What is the working principle of a plate type cooler on a ship, and what are its main components? How does it differ from other types of heat exchangers used on ships? (6)

(b) What materials are commonly used for the packing in plate type coolers on board ships, and how do these materials impact the efficiency and durability of the cooler? (5)

(c) Describe the process of back flushing a plate type cooler on a ship. Why is back flushing important, and what potential issues can it prevent or mitigate (5)

Reference Answer

(a) Plate type heat exchanger:
A plate type cooler is a compact and highly efficient heat exchanger used on ships to transfer heat between two fluids—typically fresh water, lubricating oil, or seawater —without allowing them to mix.
It works on the principle of counterflow or crossflow heat exchange , where thin metallic plates separate the two fluids.
One fluid flows along one side of each plate while the other flows along the opposite side.

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