thermal insulation
The thermal insulation (K value) of the glass should reach the level matching the local wall. For most parts of China, according to the current regulations, the K value of building wall should be less than 1. Therefore, the k value of the glass window should be less than 1 to "plug" the energy consumption hole of the building "opening". K value of glass plays a major role in energy saving of windows.
thermal insulation
The thermal insulation (shading coefficient) of glass should adapt to the characteristics of sunlight exposure in the building. Buildings with different uses have different requirements for glass insulation. For residential buildings and public buildings where people live and work, the ideal glass should allow most visible light to pass through. For example, in Beijing, it is best to let infrared rays penetrate more indoors in winter and less indoors in summer to achieve the purpose of energy saving.