Final answer:
Composite construction refers to the combination of materials used for insulation and structural integrity in the roof of a refrigerated truck compartment, enhancing its thermal efficiency.
Step-by-step explanation:
When the question refers to the roof of a refrigerated truck compartment being of composite construction, it means that the roof is made up of multiple materials that have different properties. These materials are combined to create a roof that is both insulated and structurally sound, improving its thermal efficiency. Composite materials are commonly used in various applications, including buildings, bridges, vehicles, and more.
For example, in the late 1980s, Volvo used a composite roof in their cars for an advertisement. The roof was made using a combination of materials, including an extra steel framework for reinforcement, to withstand the weight of a monster truck driving over it.
In general, composite materials offer advantages such as strength, light weight, corrosion resistance, and thermal insulation. By using different materials together, the resulting composite can have improved properties compared to its individual components.