Refrigerated Container House Insulation

For the insulation of refrigerated container houses, key attention should be paid to material selection, structural design, sealing techniques, and auxiliary temperature control measures, as detailed below:

Material Selection

The core of insulation performance lies in the thermal conductivity and thickness of the materials. Mainstream solutions include polyurethane foam layers, polystyrene foam, rock wool boards, and composite sandwich panels. For example, the heat transfer coefficient of residential container walls should be ≤0.45W/(㎡·K), which is 1.8 times more efficient in terms of thermal insulation compared to traditional brick-and-mortar walls. The structure typically consists of an outer layer of anti-corrosion color-coated steel plate to reflect sunlight, a middle layer of polyurethane foam over 50mm thick to block heat conduction, and an inner layer of fire-resistant gypsum board to assist in humidity control and temperature stabilization. Additionally, new materials such as graphene EPS modular materials and aluminum foil reflective sandwich panels can enhance insulation through their low thermal conductivity properties.

Structural Design

Multi-layer structures and ventilation design are crucial. For instance, refrigerated containers adhere to marine standards, with adjustable air inlets and outlets on the roof to regulate the internal temperature using external air and wind direction. When closed, they can isolate the interior from external temperature influences for a certain period. For residential containers, adding roof ventilation channels, bottom vents, or adjustable sunshades can create natural convection, reducing the rate of temperature increase inside the cabin during summer. Actual measurements show that high-quality structures can slow down the temperature rise inside the cabin by 22 minutes compared to the outdoors at noon in summer, and the indoor temperature only drops by 1.3℃ after being closed for 8 hours in winter.

Sealing Techniques

The sealing of joints and doors/windows directly affects the overall insulation performance. Joints between panels should be treated with professional sealing materials to prevent cold bridges; doors and windows should use double- or triple-glazed units and be fitted with sealing strips. For example, temporary construction projects in Shijiazhuang require that the fit between doors/windows and frames, as well as corner sealing treatments, meet industry standards to reduce heat leakage.

Auxiliary Temperature Control Measures

Temperature control equipment can compensate for the limitations of passive insulation. For example, adding air conditioners, graphene floor heating systems, or entrance air curtains can quickly adjust the indoor temperature; the exterior wall surface can be coated with white or light-colored finishes to enhance reflectivity, or sunshades and ventilation interlayers can be installed to reduce solar radiation heat absorption. For temporary projects, foldable containers reduce transportation costs by minimizing volume while retaining basic insulation structures, balancing flexibility and performance.