Class 2 (2nd Engineer) MEKG 📅 Feb 2025

Exam Question

(a) Draw a line diagram of an accommodation air conditioning plant labelling the principal items and showing the direction of air flow. (6)

(b) State how:

(i) Accommodation air temperature is controlled, (4)

(ii) Humidity is controlled within prescribed comfort limits, (3)

(iii) Such an installation can contribute to the efficiency of ship's main plant. (3)

Reference Answer

### (a) Line Diagram of an Accommodation Air Conditioning Plant
A detailed line diagram of a typical marine accommodation air conditioning plant would illustrate the air-side circuit, including both fresh and recirculated air paths, the treatment process, and distribution.
**Description of the Diagram and Air Flow:**
1. **Air Intake & Mixing:** A percentage of fresh air (typically 25-30%, as per regulations for ventilation) is drawn from the atmosphere via a damper. The remaining majority (70-75%) is recirculated air drawn from the accommodation spaces via return ducts. These two streams combine in a mixing chamber.

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