Q1
With reference to the construction of refrigerated spaces:
(a) state suitable materials that can be used for insulating refrigerated spaces.
(3)
(b) state the properties that an insulating material should possess.
(3)
(c) sketch a section through a wall of a cold storage space explaining how the insulation is attached to the ship's structure.
(10)
Reference Answer
### (a) Suitable Materials for Insulating Refrigerated Spaces For the insulation of refrigerated spaces onboard ships, a variety of materials can be utilized, each selected based on its thermal properties, cost, and application. Suitable materials include: 1. **Polyurethane Foam (PUF)**: This is one of the most common materials used in modern refrigerated spaces. It can be applied as rigid pre-formed slabs or foamed in-situ. It possesses an extremely low thermal conductivity (k-value) and is lightweight. Its closed-cell structure provides excellent resistance to moisture ingress. 2. **Expanded or Extruded Polystyrene (EPS/XPS)**: These are rigid foam boards that are lightweight, have good thermal resistance, and possess good compressive strength, making them suitable for floor insulation. They are also highly resistant to moisture.
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