Energy saving design of curtain wall

Energy consumption in buildings accounts for 25 percent of society’s total energy consumption, and this proportion will continue to grow as society progresses. Therefore, building energy saving will inevitably become an important measure to reduce energy consumption. Curtain wall construction, especially the glass curtain wall, doors and Windows, it is the most common building envelope, heat transfer and buildings of industry the most active and sensitive parts, loss of heat loss about 5 to 6 times of the traditional wall, its energy consumption accounts for about 40% of the whole building energy consumption, It can be seen that the energy saving of glass curtain wall, doors and Windows is directly related to building energy saving and is the key way to reduce energy consumption.

In the whole curtain wall system, the largest proportion of heat transfer is usually the panel part. Non-transparent curtain wall can facilitate the selection of insulation wall materials, transparent curtain wall can be used through the use of LOW-E online coated laminated glass, insulating glass and even vacuum glass to meet the thermal requirements of the building, of course, at the same time can reduce the shading coefficient to achieve better thermal performance in the modern curtain wall. However, due to the limitation of mechanical structure, compared with the panel, the column and beam parts are relatively weak in heat insulation performance. The heat break curtain wall has become the mainstream of the current curtain wall system, and the heat break mode of the curtain wall is basically the way of the heat break strip. The common materials are mainly Tyleno wind heat break strip, PA66 nylon heat insulation strip, and bridging-PVC. The heat break strip connects the interior and exterior curtain wall components to form a keel supporting structure of the curtain wall frame.

Among them, in addition to the heat break function, the main function of the heat break strip is to connect the aluminum alloy components of the curtain wall, so it needs to have the strength and stiffness similar to that of the aluminum alloy. In the application of engineering project, the curtain wall profile has become the key material widely used, but because the cost of the heat break bar has a great impact on the cost of the heat break profile, it also causes the increase of the curtain wall cost. Due to the requirements of heat break, the connection between the building structure and the column of the curtain wall system can only be limited to indoor, that is to say, the column supporting the curtain wall system can only be on the indoor side of the heat break strip.