29. What are energy - saving system doors and windows?
Energy - saving system doors and windows do not simply adopt heat - insulating broken - bridge aluminum profiles or Low - E insulating glass energy - saving materials. It is a perfect combination of a system and the comprehensive result of the performance of each link, and none of them can be missing. To measure whether building doors and windows are energy - saving, three main factors should be mainly considered, namely heat convection, heat conduction, and heat radiation:
1. The loss of heat is through the circulation flow of hot and cold air in the gaps of doors and windows. Heat exchange occurs through gas convection, resulting in heat loss.
2. Heat conduction is the heat transfer through the molecular motion of the materials used in doors and windows themselves. Heat is transferred from one surface of the material to another, resulting in heat loss.
1. Radiation is mainly directly transferred in the form of rays, resulting in energy consumption losses.
