Class 2 (2nd Engineer) MEKG 📅 Aug 2025

Exam Question

With Respect to Container ship:

(a) Sketch and describe a ship's indirect refrigeration system arranged for cooling containers showed in stacks in the hold.

(b) State the advantages of the system described in (a) compared with containers with their own refrigeration self-contained units.

Reference Answer

### (a) Indirect Refrigeration System for Container Ship Holds
#### Concept
An indirect refrigeration system for reefer containers utilizes a centralized primary refrigeration plant to cool a secondary, non-volatile refrigerant, typically a brine solution (e.g., Calcium Chloride). This chilled brine is then circulated to multiple local Air Handling Units (AHUs) or 'brine coolers' located adjacent to the container stacks within the cargo holds. Each AHU subsequently cools air and circulates it through a dedicated stack of containers via a system of ducts, providing precise temperature control without the need for each container to have its own integrated refrigeration machinery.
#### Construction and Arrangement

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