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Energy saving for doors and windows mainly involves developing new types of profiles and using high-performance sealing strips to improve the airtightness of doors and windows, increase thermal resistance, reduce heat transfer and indoor heat loss, and achieve energy-saving effects.

It is necessary to improve the human living environment and the development of world architecture, and it is also the focus of industrial upgrading in the future development of building technology. This article proposes the key design points and construction requirements for energy-saving doors and windows from the perspective of building energy conservation. The importance of energy-saving in doors and windows at various stages of implementation and the measures that can be taken.

Factors affecting heat loss of external windows and doors

（1） The heat transfer coefficient of external windows and doors. The heat transfer coefficient of external windows and doors refers to the amount of heat transferred per unit area per unit time. The larger the heat transfer coefficient, the greater the heat loss through doors and windows in winter. The heat transfer coefficient of doors and windows is also related to the material and type of doors and windows.

（2） The airtightness of external windows and doors. The airtightness of external doors and windows refers to the ability to prevent air infiltration when the doors and windows are closed. The indoor temperature is greatly affected by the outdoor wind force, and the airtightness level of doors and windows has a significant impact on heat loss. The higher the airtightness level, the less heat loss and the smaller the impact on room temperature.

（3） Window to wall ratio and orientation. For general buildings, the heat transfer coefficient of external doors and windows in the enclosure structure is higher than that of the external walls. Therefore, minimizing the area of external windows within the allowable range is beneficial for reducing heat loss.

Selection of energy-saving door and window materials

Energy saving doors and windows cannot be classified based on the materials they are made of, and energy-saving doors and windows that recommend a certain material cannot exclude or even belittle energy-saving doors and windows made of other materials. Due to the implementation of the national industrial policy on developing chemical building materials and the technical policy on building energy conservation, the principle of prioritizing the promotion and application of energy-saving plastic doors and windows should be implemented in energy-saving doors and windows. However, not all plastic doors and windows are energy-efficient in any region. For example, a single glass plastic sliding window has a heat transfer coefficient of 4.6-4.68 W/m2 · K and an air tightness of 1.3 m3/m · h. It cannot meet the energy-saving building design standards in Beijing, and in such areas, it cannot be called energy-saving doors and windows.

Promoting and applying energy-saving doors and windows in buildings means selecting energy-saving doors and windows that comply with the design standards and implementation details of energy-saving buildings in the region. The sealing material used for doors and windows should be selected from materials with good performance. When the construction window enters the construction site, the material properties should be checked according to the regional category:

1. Severe cold and cold regions: airtightness, heat transfer coefficient, and dew point of insulating glass;

2. Regions with hot summers and cold winters: airtightness, heat transfer coefficient, glass shading coefficient, visible light transmittance, dew point of insulating glass;

3. Regions with hot summers and warm winters: airtightness, glass shading coefficient, visible light transmittance, dew point of insulated glass.