Design of Insulated Rooms for Mobile Toilets
The design of insulated rooms for mobile toilets requires a comprehensive approach from multiple dimensions, including walls, roofs, floors, doors, and windows, combining material selection with structural design to balance insulation performance and adaptability to mobile scenarios.
Wall Insulation Design
For material selection, polyurethane foam (PU foam) is the top choice due to its low thermal conductivity (0.025 - 0.035 w/(m・k)), ability to be foamed on-site to fill gaps, reduce thermal bridges, and strength suitable for the anti-bump requirements of mobile scenarios. Alternatives include extruded polystyrene board (XPS) or expanded polystyrene board (EPS). XPS has high compressive strength (thermal conductivity 0.028 - 0.030 w/(m・k)) and requires attention to joint sealing; EPS is cost-effective (thermal conductivity 0.033 - 0.040 w/(m・k)) and needs to be paired with sealant to prevent air infiltration. Auxiliary materials such as glass wool/rock wool offer good fire resistance (Class A non-combustible) but require a moisture barrier (e.g., aluminum foil facing), making them suitable for places with high fire safety requirements like scenic spots and forest areas.
The structural design adopts a composite structure of "double-layer panels + insulation layer," such as an outer layer of color-coated steel sheet (wind and water-resistant) + insulation layer (PU foam/XPS) + inner layer of fire-resistant board/aluminum-plastic panel (aesthetically pleasing and reduces heat loss). The recommended filling thickness is 5 - 10cm (upper limit for cold regions). The frame connections require "thermal break treatment," where thermal insulation strips (e.g., nylon 66) are installed between the metal frame and the insulation layer to block thermal bridges formed by metal conduction and avoid local condensation. Simple toilet rooms can adopt a "iron sheet - foam - iron sheet" sandwich structure, with an outer layer of 0.2mm galvanized iron sheet and an internal filling of 5mm polystyrene foam夹层 (sandwich layer).
Roof Insulation Design
The insulation layer material is preferably polyurethane foam (sprayed on-site with a thickness of 8 - 12cm, fully adhering to the roof without gaps) or laid with extruded polystyrene board (covered with a waterproof membrane such as SBS modified bitumen membrane). For sloped roofs, glass wool (with aluminum foil facing) can be filled between the purlins, with an outer layer of color-coated steel sheet. Auxiliary designs include installing a reflective layer (e.g., aluminum foil reflective film) to reflect direct sunlight heat and reduce winter radiant heat loss; edge sealing treatment, using sealant + waterproof strips to double-seal the connection between the roof and walls to prevent rainwater infiltration.
Floor Insulation Design
XPS extruded polystyrene board (high compressive strength and moisture resistance) is used, laid with a thickness of 5 - 8cm. The joints are sealed with sealant, and a moisture barrier (e.g., polyethylene film) is laid between the base layer and the insulation layer to prevent ground moisture from invading and causing insulation failure.
Door and Window Insulation Design
Doors and windows require sealing treatment, using rubber strips or magnetic sealing strips to reduce cold air infiltration. Simple toilet rooms can be equipped with plastic sliding windows, which ensure ventilation needs and prevent rainwater infiltration. Some models can be equipped with small heating devices (e.g., electric heaters or solar heating systems), adopting low-power design to avoid energy waste and focusing on safety performance (e.g., preventing overheating and short-circuit risks) to assist in maintaining temperature under extreme low-temperature conditions.
