Sliding Window Series

Passive house mainly adopts three-glass thermal insulation window, counting from the outside to the inside, the second and the fifth face has low-e coating, the glass adopts warm edge spacer, the glass try to reach into the window frame 2-3cm, while the common window is only 1.5cm, the glass is filled with inert gases such as argon gas, which is used to reduce the thermal conductivity of the window body.

From the thermal conductivity of materials, metal materials than the thermal conductivity of the glass is high, while plastic, wood and thermal conductivity than the glass is low.

The thermal conductivity of the window frame can not be a single material to determine the thermal conductivity, because through the cavity structure or composite structure design can effectively improve its thermal conductivity, such as steel windows from the development of solid core steel frame for the hollow steel frame and even heat-breaking steel frame, aluminium windows from the development of ordinary aluminium alloy frame to become a heat-breaking aluminium alloy frame, wood windows from the development of solid wood structure to become a composite structure, plastic windows from the development of a single-cavity structure to become a two-cavity and three-cavity structure. Even the latest seven-cavity, eight-cavity structure of the profile. As long as the design is reasonable, high thermal conductivity of steel, aluminium materials can also become a good thermal insulation performance of the window frame materials. In contrast, plastic and wood have excellent thermal insulation properties, so these two types of window frame profiles have easier thermal insulation design, higher degree of thermal insulation, and lower energy-saving costs.

The configuration requirements of the profiles and glass in windows and doors can be determined by calculation. To ensure that the heat transfer coefficient of the whole window is lower than 0.8 (cold regions, the same below), it is required that the thermal insulation performance of the window frame and the heat transfer coefficient of the glass are lower than 0.8 W/(㎡-K). If the thermal insulation coefficient is greater than 0.8, it is necessary to reduce the glass heat transfer coefficient.

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