Symbiotic relationship between curtain wall of the

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The symbiotic relationship between building curtain wall and glass industry

China's building curtain wall started in 1978. After nearly 30 years of development, by the beginning of the 21st century, China has developed into a leading curtain wall production and use country in the world In the first 10 years of the 21st century (2001-2010), China's building curtain walls have been developing rapidly The development of building curtain wall in China is inseparable from the development of building glass in China. Building curtain wall and building glass develop synchronously, and they support and depend on each other

1. The artistic effect of building curtain wall depends on the development of new building glass The 1980s was the initial stage of building curtain wall, and there were not many varieties of building glass. It was fashionable to use colored glass (tea glass, blue glass and green glass). Later, people had higher and higher requirements for the appearance of buildings. Especially with the rise of hidden frame glass curtain wall, coated glass made the hidden frame glass curtain wall dazzling. The hidden frame glass curtain wall was favored by architects and the people and developed rapidly

2. Building glass has developed from building components to structural components The development of tempered glass, laminated glass and tempered laminated glass has brought the development of building curtain walls into a new era. Because these glasses have high mechanical properties, they can be used as materials for structural components. At this time, in addition to being used as light transmission panels supported on four sides, the glass can also be used as light transmission panels for point supporting glass curtain walls, that is, holes are opened at the four corners of the glass, and the glass is fixed on the steel claws with connectors to become point supported glass curtain walls, A pressing plate can also be set at the glass joint or four corners to fix the glass panel on the steel cable to form a single-layer cable (single-layer vertical cable) glass curtain wall Glass is the material of the beam Glass beam glued all glass curtain wall and point supported glass beam all glass curtain wall have become the favorite of the public building lobby, making the glass beam glass curtain wall and point supported glass curtain wall develop abnormally In 2006, the glass beam (including point supported) glass curtain wall reached 2.2 million square meters, and an all glass canopy with a cantilever of 5~6 meters also appeared All glass stairs are made of glass, including landing beam, platform plate, stair inclined beam and step plate The stair landing beam and the floor beam on which the stair is installed are suspended with steel cables, the stair inclined beam is fixed to the floor slab beam and the platform beam with connectors (connectors), the platform plate is fixed to the platform beam with connectors (connectors), and the step plate is also fixed to the stair inclined beam with connectors (connectors), so as to form a fully transparent stair system All glass floor means that the floor beams and floors are all made of glass materials The glass floor beam is supported on the main structure, and the glass floor is fixed on the glass floor beam with connectors (connectors) CCTV, which won the top ten best buildings in the world in 2007, used nearly 1000 square meters of glass floor. Standing on the glass floor of the CCTV sightseeing floor and looking down at the panoramic view of Beijing, it felt like looking at the earth from "Shenzhou V" and "Shenzhou VI"

3. The development of insulating glass and Low-E insulating glass has brought the energy conservation of buildings with glass curtain walls to a new stage The release of gb50189 and other energy-saving design codes put forward the requirement that the mold should be heated to 100 (1) 50 degrees for building energy conservation. With the support of the development of hollow glass, Low-E hollow glass (and vacuum glass), the building curtain wall not only has not stopped the pace of development, but also strides forward on a new platform

4. With the development of glass hot bending technology, all kinds of special - shaped buildings in China have been covered with curtain walls For example, the horn shape of Beijing Planetarium can be realized

5. Building curtain walls are constantly affected and polluted by the external environment in the process of use. In the past, they were cleaned by window cleaning machines and Spiderman. The emergence of self-cleaning glass has opened up a new way out

with the continuous development of China's construction industry, new requirements are put forward for building curtain wall and building glass. This is a new task for technicians in China's building curtain wall and building glass industry. We should dare and be good at accepting this challenge and develop better and more building glass:

first, we should develop glass with various artistic forms and colorful colors to meet the needs of various architectural decoration With the development of economy and the improvement of technology, people's living standards have also improved People have more and more diversified requirements for building functions, building colors and hues. For example, only the transparent colorless glass curtain wall can not meet the requirements. The transparent glass curtain wall is only suitable for the occasion of displaying its internal image, such as large department stores

however, it is not suitable to show its internal structure and activities on some occasions. The unidirectional transparency of coated glass makes it difficult to see the interior from the outside, but the exterior can be seen clearly from the interior The hidden frame glass curtain wall integrates the specific texture and brilliance as well as the transmission, reflection and refraction of light When the light shines on a large area of hidden frame curtain wall, because the glass has the similar property with light, it can create a unique effect of light art The coated glass has the characteristics of a mirror on the face of the light, and is as transparent as ordinary glass on the back light. The key to this magical model of reshaping competitiveness is to adhere to the unshakeable characteristics of the reform and opening-up line, creating a variety of visual viewing possibilities

The second is to develop high strength glass varieties and promote the development of all glass structure Although glass can be used as a structural member in buildings, its strength is still lower than that of other metal materials. In this way, the structural section is much larger than that of metal materials, and the material consumption is large, the section is large, the space occupied is large, and the building space is affected. This requires the development of glass with higher strength and better stability as structural members to make the glass structure lighter, reduce the occupation of building space, and make the building more beautiful, Building space utilization is more economical and reasonable

Third, develop more energy-saving glass products to promote the progress of building energy conservation in China

requirements for energy saving of curtain wall: maximize the use of natural energy for heating in winter, obtain more heat and reduce heat loss; In summer, heat gain shall be minimized and natural energy shall be used for cooling to achieve the purpose of energy saving

due to the vast territory of China and the great climate difference between the south, north, East and West, the influence of transparent curtain wall on building energy consumption mainly has two aspects: on the one hand, the thermal performance of transparent curtain wall affects the indoor and outdoor temperature difference heat transfer of heating in winter and air conditioning in summer; In addition, it is the heat gain inside the building caused by the influence of solar radiation on the transparent materials (such as glass) of the curtain wall In winter, the solar radiation entering the room through the transparent curtain wall is conducive to building energy conservation. Therefore, reducing the heat transfer coefficient of the transparent curtain wall and suppressing the temperature difference heat transfer is one of the main ways to reduce the heat loss of the transparent curtain wall; In summer, the solar radiation entering the room through the transparent curtain wall becomes the cooling load of the air conditioner. Therefore, reducing the solar radiation entering the room and reducing the temperature difference and heat transfer of the transparent curtain wall are ways to support the lightweight development of the automobile and reduce the energy consumption of the air conditioner Due to the complex changes of solar radiation in different latitudes and directions, the daily radiation intensity and peak time are different. Therefore, the energy-saving design of heat channel curtain wall in different latitudes should also be different In cold regions, the heat loss of indoor and outdoor temperature difference heat transfer during heating period is dominant Therefore, the requirements for the heat transfer coefficient of curtain wall are higher than those in the south In hot summer and warm winter areas and hot summer and cold winter areas, the load caused by solar radiation during air conditioning may become the main contradiction. Therefore, the requirements for the shading coefficient of the glass (or other transparent materials) of the curtain wall are higher than those in northern areas

on the other hand, in order to make the building adapt to different climatic conditions and meet the energy-saving requirements, the reasonable thermal performance parameters of the building envelope should be determined according to the building climate zoning where the building is located The winter cold proof and insulation of buildings are mainly considered in the severe cold and cold regions in North China. The heat transfer coefficient of building envelope has a great impact on the heating energy consumption of buildings Therefore, the limit value of heat transfer coefficient of enclosure structure is required to be higher in severe cold and cold regions In hot summer and cold winter areas, both winter thermal insulation and summer thermal insulation should be considered. Different from northern heating, the development of graphene modified energy storage devices, functional coatings, modified rubber, thermal products and special functional products is focused on one-way heat transfer process In hot summer and warm winter areas, the thermal insulation of buildings in summer is mainly considered, and solar radiation has a great impact on building energy consumption The heat of solar radiation entering the room through the curtain wall is the main cause of indoor overheating in summer. At the same time, the two-way transmission of building heat and humidity process under natural ventilation conditions should be considered. The purpose of saving energy consumption cannot be achieved by simply reducing the heat transfer coefficient of walls, roofs and windows and increasing the thickness of thermal insulation materials. Therefore, the limit requirements for the heat transfer coefficient of the enclosure structure are different It is necessary to develop glass varieties suitable for different energy-saving requirements

fourth, in order to meet the needs of photoelectric curtain wall (laminated surface), it is necessary to develop glass with high rigidity, because the silicon wafer is fragile, and the requirements for glass deflection are very strict Solar photovoltaic curtain wall is a device that converts solar energy into electric energy In the current situation of tight energy supply, it provides an unprecedented opportunity for the development of solar photovoltaic curtain wall However, the photovoltaic panel used for manufacturing the solar photovoltaic curtain wall is formed by clamping a thin silicon wafer between two pieces of glass, so the glass is the main clamping material for manufacturing the solar photovoltaic curtain wall panel. Because the silicon wafer is extremely brittle and will break if it is bent a little larger, the glass holding the silicon wafer is required to have better stiffness than the general glass

therefore, it is necessary to produce glass with greater rigidity than ordinary glass to meet the needs of the development of photoelectric curtain wall. At the same time, the transmittance of solar radiation also affects the effect of solar photovoltaic power generation. Therefore, it is required that the glass used for photoelectric curtain wall panels should have a high transmittance and strong self purification ability. Once the glass surface is polluted, it will affect the solar radiation received by the silicon wafer, making the photoelectric panels on the roof easier to accumulate dust, The solar radiation received by the silicon wafer is affected, so the glass used to make the photoelectric curtain wall panel requires high rigidity, high light transmittance and good self purification ability

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