[China Glass Net] Glass curtain wall as one of the important symbols of modern urban architecture, it breaks the boundary between traditional solid walls and doors and windows, and cleverly uses the function and decorative function of the building envelope structure. The integration makes the building more contemporary and artistic. At present, building energy conservation has become a part of China's sustainable development strategy. The awareness of building energy conservation in the whole society is gradually strengthening, giving full play to the advantages of glass curtain wall. Scientific and rational selection of glass is an effective way to break through the energy consumption of glass curtain wall.
First, the thermal insulation properties of the glass curtain wall
The thermal insulation performance of the curtain wall is solved by controlling the total thermal resistance value and selecting the corresponding material.
In order to reduce heat loss, it can be improved from the following three aspects: First, improve the thermal insulation performance of the lighting glass, try to use energy-saving glass, and reduce the opening window: Second, lining the non-lighting part with a good heat insulation effect. Wall or set insulation core: The third is sealing treatment and reducing ventilation.
The hot summer and cold winter areas should be implemented according to the “Design Standard for Energy Efficiency of Residential Buildings in Hot Summer and Cold Winter Zones†(JGJ134-2001). In the design of curtain wall, appropriate energy-saving glass should be selected according to the energy-saving measures adopted in the region.
Second, the colorful glass world - energy-saving glass
Glass is an important material that is difficult to replace in wood and doors and windows. Although the discovery of glass technology provides many choices, it is not easy to solve the problem of glass-based energy-saving glass. The contribution cannot be ignored. The energy saving of glass is inseparable from the reflection, transmission, scattering and concentrating characteristics of glass itself. It uses light reflection, refraction, scattering and concentrating to evenly distribute indoor light to avoid sunlight glare and prevent heat. Radiation will play a major role.
Endothermic glass: It can absorb or reflect specific wavelengths in the solar spectrum. The endothermic glass is a bulk colored glass with a colorant added to the transparent glass. Although the heat resistance of the heat absorbing glass is better than that of the coated glass and the ordinary transparent glass, since the heat is radiated into the room during the secondary radiation process, the heat absorption and the light transmission are often contradictory, so the heat insulating function of the heat absorbing glass is Due to certain restrictions, a considerable part of the heat absorbed by the heat absorbing glass will still be transmitted to the room. Therefore, the overall effect is not ideal when the shrapnel is used.
Heat-reflecting coated glass: The optical characteristic is reflected heat radiation. Once the reflectivity and the projection rate are determined, the unidirectional characteristics are particularly prominent. That is, it can only meet some of the requirements of the changes in the built environment, such as the resistance to heat and heat absorption as the season changes. Moreover, the heat-reflecting properties of the heat-reflective coating and the heat-absorbing glass are at the expense of light transmission, and in most cases, it is not suitable for natural daylighting.
LOW-E glass: low surface emissivity and high infrared reflectance. Low heat absorption, low temperature rise, low secondary radiant heat, in addition, the light transmittance can be 33%-72%, and the shading coefficient is 1. Choose between 25-0.68. However, the LOW-E glass heat radiation reflectivity still has a directional problem, and the relevant west indicates that whether the LOW-E surface is on the second or third side of the insulating glass, the test results of the heat penetration coefficient are winter and summer. Only 2% difference.
The conclusion is that the effect of blocking the transmission of thermal radiation is independent of the season.
Insulating glass: It is an effective support between two or more pieces of glass (called a glass substrate). The surrounding is sealed by a bonding method. The air chamber is always filled with dry gas, which makes it energy-saving. Products with three basic functions: heat insulation and anti-condensation.
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