Thermal Insulation of Container Houses

The thermal insulation of container houses can achieve good results through material selection, structural design, and process optimization, with some products' insulation performance comparable to that of traditional buildings. Here is a detailed analysis:

1. Core Insulation Materials and Structures
The thermal insulation performance of container houses primarily relies on composite sandwich panels, which consist of an outer metal layer (such as color-coated steel sheets), an intermediate insulation layer (such as polyurethane or rock wool), and an inner fireproof layer (such as gypsum board). For example, China's "Technical Standard for Steel Structure Integrated Houses" requires that the heat transfer coefficient of residential container walls be ≤0.45W/(㎡·K), which is 1.8 times the insulation efficiency of traditional brick-and-mortar walls. Measured data shows that in summer, the temperature inside the container rises 22 minutes slower than outside at noon, and in winter, the indoor temperature drops by only 1.3℃ after being closed for 8 hours, providing a more stable perceived temperature.

2. Thermal Break Design and Cold Bridge Effect Suppression
Metal container walls are prone to forming cold bridges, leading to rapid heat loss. Improvement solutions include:

• Thermal break lining structure: Fill rigid polyurethane foam between the steel frame and inner wall panels, and install rubber thermal insulation pads at the frame connections to reduce heat exchange efficiency between the inside and outside of the container by about 40%.
• Aluminum foil reflective layer: Some products use sandwich panels with an aluminum foil reflective layer, combined with adjustable sunshades and bottom ventilation slots, to further reduce heat conduction. For example, a café in Moganshan uses this design, maintaining indoor comfort in summer without air conditioning.

3. Sealing Process and Overall Airtightness
Thermal insulation performance also depends on panel splicing and door/window sealing:

• Splicing process: Excellent sealing processes can eliminate panel gaps and avoid cold bridge effects. For example, products from Hebei Yaolong Steel Structure Engineering Co., Ltd. reduce heat loss through high-precision splicing.
• Door and window design: Double-glazed windows and sealing strips are used to improve airtightness. Some projects use customized door and window systems to raise indoor temperatures by 8-10℃ in winter compared to the outside, reducing heating dependence.

4. Performance Verification in Practical Applications

• Extreme environment testing: The Khabarovsk project in Russia (average winter temperatures ranging from -40 to -16℃) ensures stable indoor temperatures in severe cold through optimized thermal break design and sealing processes.
• Long-term usage data: Qinghai Guangzan Light Steel Housing Engineering Co., Ltd. states that regularly maintained container houses can have a service life of 20-30 years, with minimal impact on insulation performance due to material aging.

5. Supplementary Technologies
Insulation materials need to be used in conjunction with air conditioning and ventilation systems. For example, Qinghai Guangzan Light Steel emphasizes that thickening the insulation layer can make the thermal insulation effect of container houses no less than that of buildings, but air conditioning is still needed for cooling in summer, and heating equipment is relied upon for maintaining comfort in winter.