With the changes of the times, the requirements of buildings for doors and windows are constantly upgraded, and new types of doors and windows are emerging in an endless stream. In order to adapt to the changes of the times, the new national standard "GB/T 8478-2020 aluminum alloy doors and windows" gives a lot of new era terms And definition.

1. Insulation performance of doors and windows

The ability of doors and windows to prevent heat transfer from the indoor high temperature side to the outdoor low temperature side in winter is characterized by the heat transfer coefficient K.

2. Thermal insulation performance of doors and windows

The ability of doors and windows to block solar heat gain in summer is characterized by the solar heat gain coefficient SHGC (solar total transmittance).

Note: The scaring people of doors and windows also include the part that prevents the temperature difference generated by the outdoor high temperature, but because the temperature difference heat is much smaller than the solar radiation heat, the thermal insulation performance of doors and windows is mainly characterized by its solar heat gain coefficient.

3. Ordinary doors and windows

Only the outer doors and windows required by airtight performance, watertightness and wind pressure resistance index and the following two kinds of inner doors and windows: 1) only have airtightness index requirements 2) no airtight performance, watertight performance, wind pressure resistance, insulation Acoustic performance, heat preservation performance, complete fire resistance and other performance indicators.