The construction of refrigerated trailer walls typically involves the use of specific materials designed to provide excellent insulation and maintain the required temperature control. Based on the search results, here are the materials commonly used:
- Polyurethane (PU) Foam: This is the most commonly used insulation material for refrigerated vehicles due to its good mechanical strength, low hydrophilicity, and low cost . PU foam is popular because it allows the production of self-supporting refrigerated bodies as an alternative to standard construction .
- Phase Change Materials (PCM): PCMs are being increasingly integrated into the insulation of refrigerated trailers to improve thermal efficiency. They are designed to store thermal energy and temporarily reduce thermal conductivity . Research has shown that the inclusion of paraffin-based PCMs in standard trailer walls can significantly reduce peak heat transfer rates and total heat flows into the refrigerated trailer, leading to potential energy savings and reduced pollution from diesel-driven refrigeration units .
- Steel Sheets: The standard walls of refrigerated trailers are often constructed in a sandwich panel design with PU foam sandwiched between two layers of steel sheets. These outer layers provide protection to the inner layer and ensure the required strength .
- Polyester (PE) or Acrylonitrile Butadiene Styrene (ABS) Composite: These materials are used for the lining of the trailer walls. They combine a resin with fiberglass reinforcement to obtain high chemical and mechanical strength. Polyester is particularly used for its robustness even at low temperatures and its resistance to rot, scratches, and ease of cleaning .
- Vinyl Foam: Although not as commonly mentioned, vinyl foam is another material that can be used in the core of the sandwich panel construction for its insulating properties .
These materials are selected for their ability to provide effective insulation, withstand harsh environmental conditions, and contribute to the overall durability and efficiency of the refrigerated trailer.
