How to Keep Container Houses Cool

Heat prevention in container houses can be achieved through optimizing materials, structural design, and auxiliary measures. Here are the specific methods:

1. Core Material Selection and Thickness Optimization

The thermal insulation performance of container houses mainly depends on the material and thickness of the sandwich panels. It is recommended to use polyurethane, rock wool, or glass wool sandwich panels, which have low thermal conductivity and can effectively block heat transfer. For example, the heat transfer coefficient of a polyurethane foam layer over 50mm thick is ≤0.45W/(㎡·K), with a thermal insulation efficiency 1.8 times that of traditional brick-and-mortar walls. If the budget is limited, EPS (expanded polystyrene) panels can be chosen, but it is essential to ensure that the thickness meets the standard (recommended ≥50mm) to avoid indoor temperatures exceeding 40℃ in summer due to overly thin materials. Additionally, using a combination of fire-resistant gypsum board and a moisture barrier for the inner layer can help control humidity and stabilize temperature, reducing the combined effects of heat and moisture.

2. Structural Design to Enhance Thermal Resistance

1. Multi-layer Composite Structure: Use anti-corrosion color-coated steel sheets on the outer layer to reflect sunlight, fill the middle layer with high-density thermal insulation materials, and install fire-resistant gypsum board on the inner layer, forming a triple protection of 'reflection-blocking-stabilization'. For example, a café in Moganshan adopted sandwich panels with an aluminum foil reflective layer, combined with bottom ventilation slots, utilizing air circulation to accelerate heat dissipation. The measured indoor temperature in the afternoon was 5-8℃ lower than the outdoor temperature.
2. Sealing Treatment at Connection Points: Install sealing strips at the joints of containers and around doors and windows to fill gaps and prevent the infiltration of hot air. For example, using triple-glazed windows can reduce the thermal conductivity by more than 60% compared to single-glazed windows, significantly reducing heat loss through windows.

3. Auxiliary Measures to Improve Comfort

1. Shading and Ventilation Systems: Install adjustable shading canopies or eaves on the roof to block direct sunlight; set up ventilation slots at the bottom to utilize the thermal pressure principle for natural convection, lowering the indoor temperature. For example, a sloped roof design can guide hot air upward and out, while floor-to-ceiling windows enhance lighting while avoiding glare.
2. Temperature Control Equipment Configuration: In summer, small air conditioners or exhaust fans can be used, while in winter, electric heaters or graphene floor heating can be employed. It is important to match the equipment power with the house volume to avoid energy waste. For example, a 1.5-horsepower air conditioner is sufficient for a 20㎡ container house to meet cooling needs.
3. Floor and Interior Optimization: Lay thermal insulation boards or carpets on the floor to reduce heat transfer through the floor; use light-colored paint on interior walls to reflect heat and avoid heat absorption by dark materials. For example, calcium silicate board interior walls combined with a moisture barrier can simultaneously improve fire resistance and thermal insulation.

4. Special Scenario-Specific Treatments

In high-temperature and high-humidity areas (such as coastal construction sites), it is necessary to strengthen moisture-proof measures to prevent the thermal insulation materials from losing effectiveness due to moisture. For example, adding a moisture barrier to the inner layer of the sandwich panels or choosing hydrophobic rock wool panels can ensure long-term stability of thermal insulation performance.