[Alcoa.net] Aluminum alloy doors and windows are essential components of a building's exterior structure and play a crucial role in heat exchange. They account for 5 to 6 times more energy consumption per unit area compared to walls, and thermal losses through doors and windows can exceed 40% of the total energy loss in a building. Heat loss occurs in three main ways: conduction through the aluminum profiles, radiation through the glass, and air convection through gaps in the door and window frames. Therefore, the development of insulating and energy-efficient aluminum doors and windows must address these three key areas effectively.
1. Thermal Insulation of Aluminum Profiles Aluminum is a highly conductive material, which makes it important to use thermally broken profiles in insulated doors and windows. These profiles are designed with an insulating bridge that interrupts the heat conduction path, significantly reducing heat transfer and improving energy efficiency.
2. Insulating Glass To enhance insulation, double or triple-glazed units are commonly used. These consist of two or three panes of glass with sealed air spaces between them. The dry, static air in these cavities acts as an excellent insulator, reducing heat transfer and improving soundproofing, condensation resistance, and overall comfort. Typical thicknesses for the glass are 5-6 mm, with air cavities ranging from 9 mm to 12 mm.
3. Sealing Materials High-quality weather-resistant rubber seals are essential for maintaining thermal performance. Neoprene rubber is often preferred due to its resistance to ozone, UV aging, and weathering. Multiple sealing points are typically installed on the moving parts of doors and windows to ensure tight closure and prevent air leakage, further enhancing energy efficiency and indoor comfort.
By addressing all three aspects—thermal insulation of the profiles, use of insulating glass, and proper sealing—aluminum doors and windows can significantly reduce energy consumption, improve building performance, and contribute to a more sustainable environment.
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