Thermal Insulation Wall of Container House
The thermal insulation wall of container houses mainly achieves efficient thermal insulation by adopting a composite sandwich panel structure, optimizing the performance of thermal insulation materials, and strengthening the splicing and sealing process. The following is an analysis from four dimensions: materials, structure, process, and application scenarios.
1. Core Thermal Insulation Materials and Structure
The thermal insulation wall of container houses usually uses a composite sandwich panel as the enclosure structure, which consists of an outer metal panel (such as an anti-corrosion color-coated steel plate), an intermediate thermal insulation layer, and an inner functional panel (such as a fire-resistant gypsum board).
- The intermediate thermal insulation layer is crucial. Commonly used materials include polyurethane foam panels, rock wool panels, and phenolic foam panels. For example, the thickness of the polyurethane foam layer needs to be more than 50mm, with a thermal conductivity as low as 0.022-0.028W/(m·K), effectively blocking heat conduction. Rock wool panels, with their Class A fire resistance and a thermal conductivity of 0.036W/(m·K), balance thermal insulation and safety.
- The outer metal panel (such as a color-coated steel plate) reduces heat radiation by reflecting sunlight, while the inner gypsum board and moisture-proof film work together to control humidity and stabilize temperature, forming a multi-layer thermal barrier.
2. Structural Design and Performance Standards
The performance of the thermal insulation wall needs to meet national regulatory requirements. For example, the "Technical Standard for Steel Structure Integrated Houses" stipulates that the heat transfer coefficient of the walls of residential container houses should be ≤0.45W/(㎡·K), which is 1.8 times the thermal insulation efficiency of traditional brick-and-mortar walls.
- Actual measurement data shows that in summer, the cabin warms up 22 minutes slower than the outdoors at noon, and in winter, the indoor temperature only drops by 1.3℃ after being closed for 8 hours, with small fluctuations in perceived temperature and significantly improved comfort.
- Modular design allows the walls to be combined according to needs. For example, double-layer containers equipped with aluminum foil reflective layer sandwich panels, adjustable sunshades, and bottom ventilation slots can further optimize thermal performance.
3. Splicing Process and Sealing Treatment
The thermal insulation effect depends on the sealing of the wall splicing.
- Control of the cold bridge effect: Special sealing processes (such as double-layer sealing strips) need to be adopted at the panel splicing points to avoid heat loss caused by gaps. For example, the thermal insulation containers of Shandong Jinda Lvjian use anti-rust steel frames and special sealing processes at the seams, with a waterproof rating of IPX4, effectively preventing rainwater penetration.
- Window and door optimization: Double-layer or triple-layer insulating glass (with a thermal conductivity ≤1.8W/(㎡·K)) is selected, and sealing strips are installed to reduce heat loss.
4. Application Scenarios and Selection Suggestions
The needs for thermal insulation walls vary significantly in different scenarios:
- Long-term stationing scenarios (such as construction site barracks in northern China): Priority should be given to products with stable thermal insulation performance and high structural strength, such as containers using high-density polyurethane sandwich panels, which can reduce winter heating energy consumption by 42%.
- Short-term use scenarios (such as temporary offices and commercial exhibition points): Expandable products can be selected to expand the space by unfolding the double-sided structure while balancing thermal insulation and flexibility.
- Frequent moving scenarios: Foldable temporary building products can be folded to reduce their volume to 1/3, lowering transportation costs without affecting thermal insulation performance.
