Class 2 (2nd Engineer) MEKG 📅 Apr 2025

Exam Question

(a) Describe the purpose and main components of an air conditioning system used on ships. Describe the layout and working of the system with the help of a diagram. Describe the function of the unloader in the compressor and its importance during system operation. (6)

(b) Name the thermodynamic cycle on which the marine air conditioning system operates. Explain this cycle using a pressure enthalpy (P-h) diagram and describe the role of each component in the cycle. (10)

Reference Answer

### (a) Marine Air Conditioning System
#### Purpose
The primary purpose of a marine air conditioning (A/C) system is to maintain the environmental conditions within the ship's accommodation, control rooms, and specific machinery spaces at a comfortable and safe level. This is achieved by controlling three key parameters:
* **Temperature**: Providing cooling (and sometimes heating) to maintain a set temperature for crew comfort and equipment reliability.

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