Exam Question

### (a) Basic Function of a Heat Exchanger (3 Marks)
The fundamental function of a heat exchanger is to facilitate the transfer of thermal energy (heat) from a hotter fluid to a colder fluid. This process is achieved without allowing the two fluids to come into direct contact or mix. The heat transfer occurs across a solid, thermally conductive boundary, such as a tube wall or plate.
Key functions in a marine context include:
* **Temperature Regulation:** Maintaining optimal operating temperatures for main engines and auxiliary machinery by removing excess heat (e.g., Jacket Water Coolers, Lube Oil Coolers).