Thermal Insulation of Refrigerated Container Houses
The thermal insulation of refrigerated container houses is mainly achieved through material selection, structural design, and process optimization, with core parameters including the thickness of the insulation layer, the thermal conductivity of the material, sealing performance, and the overall structural airtightness.
Material Selection and Thermal Insulation Principles
The thermal insulation performance of refrigerated container houses relies on materials with low thermal conductivity. For example, the polyurethane foam layer (with a thermal conductivity of ≤0.024W/(m·K)) is a commonly used core insulation material, typically exceeding 50mm in thickness, effectively blocking heat conduction. Additionally, rock wool boards (with a thermal conductivity of approximately 0.036W/(m·K)) offer both fire resistance and thermal insulation, suitable for high-temperature or fire-resistant scenarios. Outer-layer materials like anti-corrosion color-coated steel plates reduce heat absorption by reflecting sunlight, while inner-layer fire-resistant gypsum boards and moisture-proof films work together to control humidity and stabilize temperature, forming a multi-layer thermal insulation barrier.
Structural Design and Thermal Performance
The thermal insulation structure of container houses typically adopts a "sandwich" design: an outer reflective layer (such as nano-scale reflective coatings with a sunlight reflectivity of >85%), an intermediate insulation layer (polyurethane or rock wool), and an inner temperature control layer (gypsum board + moisture-proof film). For instance, Zeyu Housing reduces the heat conduction coefficient by 31% through a multi-cavity thermal break aluminum structure, combined with a concave-convex slot waterproof design to block the "thermal bridge effect," achieving an overall heat transfer coefficient (K-value) of ≤0.38W/(m²·K). In extreme temperature differences of 100℃, the temperature difference inside the container is controlled within ±3℃. Furthermore, the research and application of dynamic shading systems and aerogel insulation layers can further reduce energy consumption by 15%, breaking through the "sauna effect" of traditional integrated houses.
Process Optimization and Sealing Performance
Thermal insulation performance also depends on the splicing process and overall airtightness. Seamless welding or bolt connections reduce structural gaps and avoid thermal bridges; double-glazed windows and doors (reducing thermal conductivity by more than 50%) and sealing strips effectively minimize heat leakage. For example, in temporary construction projects in Shijiazhuang, the impact of gaps at panel joints is minimized, ensuring structural stability and airtightness through professional sealing materials and construction methods.
Practical Applications and Standards
The national "Technical Standard for Steel Structure Integrated Houses" stipulates that the heat transfer coefficient of residential container walls must be ≤0.45W/(㎡·K), equivalent to 1.8 times the insulation efficiency of traditional brick-concrete walls. Measured data shows that high-quality refrigerated container houses experience a 22-minute slower temperature rise inside the cabin compared to the outdoors at noon in summer, and the indoor temperature drops by only 1.3℃ after 8 hours of closure in winter, providing a more stable perceived temperature.
