What are the advantages and disadvantages of double-layer glass curtain wall?

Sound insulation: Double-layer glass curtain wall reduces the impact of outdoor noise on indoor due to the shielding effect of skin on noise. It is especially suitable for buildings in the urban center and in the environment with strong traffic noise. At the same time, the double-layer glass curtain wall can still introduce natural ventilation in the strong noise environment, which reduces the building energy consumption.

Thermal insulation: In winter, the existence of the external curtain wall enhances the thermal insulation performance of the external protective structure. By preheating the air between the double glass curtain walls, the heat loss on the building surface can be effectively reduced. Moreover, because the temperature of the inner curtain wall is relatively high, it is beneficial to indoor thermal comfort.

Ventilation and cooling at night: In hot summer, the temperature in the sunshade building may be too high. However, the double-layer glass curtain wall does not directly open the ventilation, so it has the function of safety protection, so that the office building can be cooled indoors by natural ventilation with cold air at night during the off-duty hours in summer.

The sunshade blinds of double-layer glass curtain wall are installed in the interlayer, which is more conducive to protecting the blinds, especially some metal blinds with complex functions and high cost. Sun and rain will not only shorten the service life, but also affect its shading and reflective effect. In addition, external shutters often produce environmental noise. The high-tech park in the suburb of Munich, Germany, designed by the famous Japanese architect Zhen, uses external metal shutters, which ring in the breeze all day, but the shutters set between double glass curtain walls do not have this problem.

Because of the existence of external curtain wall, the wind pressure inside the building is reduced, and the heat makes it possible for high-rise buildings to open windows freely. This alone can greatly reduce the energy consumption required for mechanical ventilation in high-rise buildings. In architectural design, the double-layer glass curtain wall uses a large area of glass, which makes the building obtain high permeability.

Natural ventilation: A very important advantage of double-layer glass curtain wall is that it can make natural ventilation. Natural ventilation can not only reduce the energy consumption of air conditioning, but also help to improve the comfort of the environment and enhance human health. The interlayer of double-layer glass curtain wall can be used as a fire escape.

Energy-saving: Because the double-layer glass curtain wall improves the thermal insulation performance of the building, and shading can naturally ventilate for a long time, the building can fully save energy and reduce energy consumption.

Disadvantages: Compared with ordinary buildings, the cost of the outer envelope structure is increased by 1.5-2 times.

In summer, under the strong sunlight, the temperature in the interlayer air is often too high, especially when the distance between double-layer glass curtain walls is too small and the shading effect is not good, its temperature sometimes exceeds the outdoor temperature, so it is impossible to obtain natural ventilation by opening windows.

The cleaning and maintenance costs of building curtain walls have increased. Considering the local climate and the special high-altitude environment of high-rise buildings, double-layer glass curtain wall has the most basic function, and shading is also harmful to the outside world.

Adverse climate and environmental impacts have a buffering and weakening effect, which can minimize dependence on non-renewable energy. This design idea and starting point will have far-reaching significance for saving energy and creating a sustainable future.

Source: Big Cat Network