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When the sun is used on the glass curtain wall

  • Author:Fanyu
  • Source:Chinamirrormanufacturer.com
  • Release on :2018-03-27
Glass curtain wall, as the main body of most modern public buildings, is the main part of the external protective structure. It is the active and sensitive part of heat exchange and heat conduction in the entire building. Its heat loss is 5-6 times that of the traditional building wall, and energy consumption accounts for the entire The building energy consumption is about 40%. Therefore, energy conservation of glass curtain walls is very important.
Glass curtain wall
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The use of shading is an important means of achieving energy conservation in glass curtain walls. Taiwan's Silaya Research Office had research shows that external shading and glass shading are important factors for energy conservation in external walls. Both glass material and external shading affect the size of shading, and external shading, such as roller blinds and louvers, are far more varied. The effect of glass material is great
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TheWhat is the effect of setting a sunshade on a glass curtain wall?
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1. Shade insulation. The glass itself has high heat transfer and high thermal transmittance. In summer, sunlight penetrates the glass and enters the room, which is the main cause of indoor overheating. This phenomenon is especially noticeable in hot regions in the south. The provision of a sunshade system on the glass curtain wall can greatly reduce solar radiation and thus avoid indoor overheating.
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In addition, the shading coefficient is also an important factor in determining the shading and heat insulation performance of the building envelope structure. The smaller the shading coefficient, the lower the amount of solar radiation that passes through the enclosure structure, and the better the heat protection effect. “Some people have made observations in the Guangzhou area, and the shading coefficients of each orientation window obtained are: westward 17%, southward 45%, and northward 60%.” Thus, the effect of the sunshade on blocking solar radiant heat is quite large. , The glass curtain wall construction set the effect of the shading measures more obvious.
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2. Adjust the room temperature. Test observations in the summer heat show that in the case of closed windows, when there is a shade, the room temperature wave amplitude is small, the room temperature has a large time delay, and the room temperature is relatively uniform. Therefore, shading can reduce the cooling load and help reduce the indoor temperature of the glass curtain wall building.
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3. Lighting. From the perspective of natural lighting, after setting the sunshade, direct sunlight will be blocked, glare will be prevented, and the indoor illumination will be distributed more evenly, which will contribute to normal vision work. In addition, the sunshade can also disperse the reflected light of the glass (especially the coated glass) to avoid light pollution caused by the reflection of the large area of ​​the glass. However, due to the light blocking effect of the sunshade, the indoor illumination will be reduced to a certain extent. Therefore, at the beginning of the design of the shading system, comprehensive consideration must be given to satisfy the requirements of natural indoor lighting.
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4. Beautiful. Some people think that the design of glass curtain walls can only be flat and cannot be used for designing facilities such as external sunshades. However, in many foreign countries, many glass curtain wall buildings have been shaded, which has become an interesting part of architectural modeling. The shading system forms a light and shadow effect on the glass wall, demonstrating the aesthetic effects of contemporary architectural art.
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TheXianglian External Shade Project · Xingsha Administration Center
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Of course, we can set the shade to be temporary based on local climate characteristics and room usage requirements. It is to install various kinds of shades or sun visors inside and outside the glass curtain wall. Temporary is to install light curtains, bamboo curtains, and soft louvers on the inside and outside of the glass. Divided from the location of "exterior shading" and "internal shading" of the distinction, which can be divided into "active shading" and "fixed shading."
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Active shade. This form of shading can arbitrarily adjust the shading angle according to different seasons, times, and climate changes.
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From the standpoint of the effectiveness of the shading, temporary solar shading measures such as drapes, louvers and the like, most of the solar radiant heat absorbed will be emitted to the indoor air. If the external shading product is installed, the heat insulation effect is better, and the absorbed ultraviolet rays will be more dispersed in the outdoor air and the heat entering the room will be less.
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There is also a smart shade system that is also ideal for use on glass curtain walls. It can intelligently identify daily weather, temperature, UV intensity, etc., and automatically adjust shading measures to a good angle so that the interior can reach a comfortable state.
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The exterior shade of glass curtain wall is divided into vertical shading, horizontal shading and comprehensive shading.
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Vertical sunshade is suitable for covering a small angle, fromglassThe sunlight coming in from the side of the window is not sheltered from the sun's rays, which are shot from the top of the window, or from the sun's rays that were not shot near sunrise. The vertical shade is mainly applied to the glass curtain wall buildings in the northeast, north and northwest.The
The horizontal shading can effectively block the sunlight that is projected from the side of the glass wall with a large height of the sun. It applies to the south facing glass curtain wall building.
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The integrated sunshade can effectively block the high-angle, moderate sunlight that shines from the front of the glass window. The shading effect is relatively uniform and is applicable to glass curtain wall constructions in the southeast or southwest direction.
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With the glass curtain wall structure behind the shading facilities, it is very cool and eye-catching to keep building energy-saving properties. But do you know? Because glass curtain walls may cause self-explosion or light pollution, not all locations can be used.
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In China, glass curtain walls are generally used in public buildings, and most of the exterior shades used are mainly louvers, such as wing louvers.
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In a word, setting a reasonable shade system on the glass curtain wall building not only helps to achieve building energy conservation, but also reflects the art of architecture aesthetics.