Doors and windows have the function of lighting, ventilation and enclosure, and play an important role in the art of architectural construction. However, doors and windows are the most vulnerable parts of energy loss. In order to increase the lighting and ventilation area or to express the character of modern buildings, the doors and windows of the building are getting larger and larger, and there are all-glass curtain wall buildings. This puts higher requirements on the energy conservation of the external maintenance structure.

At present, the energy-saving treatment of doors and windows is mainly to improve the thermal insulation performance of materials and improve the sealing performance of doors and windows. From the perspective of door and window materials, in recent years, there have been some high-tech energy-saving products such as aluminum alloy heat-insulating profiles, aluminum-wood composite profiles, steel-plastic integrated extruded profiles, plastic-wood composite profiles and UPVC plastic profiles.

Among them, the UPVC plastic profile is widely used, and the raw material used is a polymer material - rigid polyvinyl chloride. It not only consumes less energy and no pollution during the production process, but also has small thermal conductivity of the material and good sealing performance of the multi-cavity structure, so the thermal insulation performance is good. UPVC plastic doors and windows have been used in European countries for many years, and plastic doors and windows in Germany have accounted for 50%.

After the 1990s, the amount of plastic doors and windows in China continued to increase, and it was gradually replacing materials with high energy consumption such as steel and aluminum alloy. In order to solve the problem of excessive energy loss caused by large-area glass, people use high-tech to process ordinary glass into insulating glass, coated film glass (including reflective glass, heat absorbing glass), high-strength LOW2E fire-proof glass (high-strength low-radiation coating) Fireproof glass), using a magnetically controlled vacuum sputtering method to plate glass containing a metallic silver layer and the most special smart glass.

Smart glass can sense and change the external light. There are two types, one is photochromic glass. When the light is irradiated, the glass will be dimmed and the light will not pass through. When the light is stopped, the glass will be bright. Light can pass through. When the sun is strong, it can block the heat of the sun; when it is cloudy, the glass becomes bright and the sunlight can enter the room again. The other type is electrochromic glass, which is coated with a conductive film and a color-changing substance on two pieces of glass. By adjusting the voltage, the color-changing substance is discolored and the incident sunlight is adjusted (but due to its high production cost, it is not practical yet. ), these glasses have a very good energy saving effect.

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