ã€ALUMINIUM CHINA NETWORK】In recent years, with the rapid development of the building doors and windows and glass curtain wall industry in China, traditional wooden windows, solid belly and fasting steel windows have basically been eliminated, and various new types of building doors, windows and glass curtain walls have been widely used. . Because of the changes in structure and materials, these products really make people feel pleasing, but there are still problems in terms of function, especially in terms of thermal performance, energy loss, ideal indoor temperature environment cannot be guaranteed, and so people gradually feel that The use of common windows and curtain walls in cold or hot areas is not sufficient. According to the statistics of relevant departments of the Ministry of Construction, China’s building energy consumption accounts for about 25% of the country’s total energy consumption. Among the energy consumption during construction and energy consumption during operation, the operating energy consumption occupies the majority. The energy loss from the loss of doors and windows and curtain walls accounts for about 51% of the energy consumption of the building operations. It can be seen that the energy saving of windows and curtain walls in hot or cold areas is worth studying!
1. Energy-saving construction of aluminum alloy windows and curtain walls includes many aspects, and the energy saving of aluminum alloy windows and glass curtain walls is an important part of them. The energy saving of aluminum alloy windows and curtain walls mainly refers to the process of obtaining the ideal temperature environment and light environment with minimal energy consumption during the use of the building through the product's structural design, material selection, and other measures. For example, in hot summers and cold winters, people often need to use electrical facilities that consume electrical energy to regulate the indoor temperature environment in order to obtain a normal use environment. The energy saving effect of windows and curtain walls directly affects the energy consumption. In general, energy-saving windows and energy-saving curtain wall products should have high thermal insulation performance in hot summer and high insulation performance in cold winter.
Second, doors, windows, curtain walls, energy-saving methods support glass curtain wall energy-saving law for aluminum alloy windows and glass curtain walls, because the area of ​​glass occupy the vast majority of the facade, can participate in the larger area of ​​heat exchange, it determines the glass is The key to the energy saving of windows and glass curtain walls. Whether the glass is coated and the material of the film can be used to determine its energy saving effect. Generally, the glass can be divided into the following categories: 1) Float clear glass 2) On-line coated glass 3) Off-line coated glass 4) Low-emission on-line coated glass 5) Low-radiation off-line coated glass. Although there is no obvious change in the heat transfer coefficient of these glasses, the energy-saving effect of the film increases sequentially due to the different ability of the film to control light (energy).
Aluminum alloy thermal cut energy-saving law:
Aluminum alloy profiles in the window and curtain wall system not only play the role of supporting the keel, but also have a great impact on the energy saving effect. Under normal circumstances, the aluminum alloy section is much smaller than the glass area. For this reason, the thermal conductivity has a greater impact on the energy-saving effect. For this reason, a heat-dissipating section is produced. According to the different methods of heat-dissipating aluminum profiles, it is divided into perfusion-type heat-insulating aluminum profiles and cutting-bar-type heat-insulating aluminum profiles. The common feature of these two types of aluminum alloy heat-insulating profiles is that the aluminum materials on the inner and outer sides are separated by a low thermal conductivity insulating material with sufficient strength. This reduces the heat transfer coefficient and increases the thermal resistance. Even in the hot summer season, when the sun is exposed, the surface temperature of the outdoor section of the hot-junction profile can usually reach 35 to 85°C, while the room can still be maintained at about 24 to 28°C, effectively reducing the amount of heat transferred to the room. Reduce cooling costs; in the cold winter, the outdoor aluminum temperature can be equivalent to the ambient temperature (typically -28 ~ -20 °C) and the indoor aluminum can still reach 8 ~ 15 °C, thereby reducing heat loss, saving winter heating Costs to achieve energy savings.
