Scientists besieged the ＂glass curtain wall＂ and experts suggested filming it.

Workers are cleaning the glass curtain wall of a hotel.

　　　 Whether there is a glass curtain wall in the school building has become one of the criteria for judging universities by Yang Fujia, vice chairman of China Association for Science and Technology and academician of Chinese Academy of Sciences. On the 8th, at the 2007 annual meeting of China Association for Science and Technology held in Wuhan, Hubei Province, when asked about his impression of universities in Wuhan, Yang Fujia said that there are many universities in Wuhan, and there are many famous schools, and they all feel good, but he saw buildings with glass curtain walls in some universities, which made him dissatisfied. In the invited report meeting of the annual meeting, Yang Fujia also specially chose "Energy Saving and Emission Reduction and Doing Things as a Person" as the theme of the report. He talked about the starting point of energy conservation and emission reduction, which is the building. Because "99% of the existing buildings are high-energy buildings, and the heating energy consumption per unit building area is equivalent to 2 to 3 times that of developed countries with similar climatic conditions."

　　　 In the report, Yang Fujia showed a house designed by a British architect named Dunster. He personally visited the architect and visited the architect’s home. There are solar panels on the roof of Dunster’s house, and the wall insulation layer is very thick. Energy saving and environmental protection are considered in all aspects. Yang Fujia learned from Dunster’s subordinates that Dunster’s goal is to save energy and reduce emissions, and it is cheap and good.

　　　 However, the buildings in many cities in China are obviously dissatisfied with Yang Fujia. "Many buildings in Wuhan are covered with large pieces of glass. Where can there be such energy saving?"

　　　 He turned to say that the world’s largest school gate, the tallest building and the largest library all belong to China. "But which of these buildings is energy-efficient?" He believes that the building of glass curtain wall is especially unsuitable for colleges and universities, which will have an impact on the image and concept of colleges and universities.

　　　 In fact, this is not the only criticism of the glass curtain wall at the annual meeting of the Association for Science and Technology. On the 10th, the annual meeting of Green Building and Urban Energy Conservation Branch was held in Wuhan University, and some experts studying building energy conservation pointed their finger at the glass curtain wall.

　　　 Tang Mingfang, a professor at the School of Architecture and Urban Planning of Chongqing University, said that environmentally friendly buildings mean being friendly to the environment, occupying less resources, saving energy, land, water and materials, and having little negative impact. From this point of view, the glass curtain wall is undoubtedly not environmentally friendly, because it occupies many and expensive building materials, and it will cause the greenhouse effect and increase the energy consumption of cooling in the days of sunlight. If the glass curtain wall is used to avoid the greenhouse effect, it is necessary to add blinds behind the glass curtain wall, which increases the construction cost.

　　　 Pan Saijun, a senior engineer of Taizhou Construction Engineering Design Review Center, Zhejiang Province, said that from the construction situation there, the construction cost is very different without using glass curtain walls. The cost of the glass curtain wall is around 600 yuan per square meter, so the cost of such a building increases by tens of millions or even tens of millions of yuan.

　　　 He believes that the light pollution caused by the glass curtain wall is also a kind of "urban disease". Strong reflected light will enter the nearby residential building, which will increase the indoor temperature in the building and increase the cost of cooling. At the same time, the strong reflected light will also cause troubles to passers-by and drivers. Some drivers will be temporarily blurred by the reflected light from the glass curtain wall, which may lead to car accidents.

　　　 Some experts worry that the falling and breaking of the glass curtain wall may become a potential safety hazard in the city. Although the quality and strength of building glass are adequately guaranteed at present, after all, the earthquake resistance and deformation resistance of glass are deficient. Once encountering typhoons, hurricanes, earthquakes, hail, sudden changes in temperature difference, etc., it may lead to safety incidents.

　　　 This kind of worry is not without reason. According to the data, the Hancock Building in Boston, designed by I.M. Pei in 1971, is a glass curtain wall skyscraper that once sensationalized Europe and America. However, after the completion, glass broke one after another. A storm in 1973 broke dozens of pieces of glass, and the broken glass fell and broke other glasses, so the building was once riddled with holes.

　　　 In fact, it is rare for foreign buildings to adopt glass curtain wall, and most of the external decoration of buildings is still mainly paint and tile. But in China, it is very common to use glass curtain wall in urban buildings.

　　　 Professor Tang Mingfang believes that some government agencies now use large glass curtain walls when building buildings, which has set a bad example. Pan Saijun believes that the building review department is also responsible. He admits that the renderings of glass curtain wall buildings often look more beautiful and imposing, and it is easier to pass the audit of the construction planning department.

related news

　　Expert’s energy-saving advice: film the glass curtain wall　　　

　　　 At present, there are 2,239 glass curtain wall buildings in Shanghai, of which 545 have been built for more than 10 years. A few days ago, the reporter learned from relevant parties that the comprehensive transformation of the glass curtain walls of these 545 buildings will become a focus of the next phase of building energy-saving transformation in this city. Experts believe that it is relatively simple to film the glass curtain wall, and the safety film sticks to the glass. Even if the glass is broken, it will not rain. Relevant persons from the Municipal Construction and Transportation Commission said that the energy consumption of buildings has accounted for about 20% of the energy consumption in Shanghai, and there is still a growing trend. Among them, the energy consumption of public buildings accounts for the "big head" of the total energy consumption of buildings in Shanghai.

　　　 Lu Jinlong, director of the Institute of Engineering and Materials Testing, Shanghai Institute of Building Research (Group) Co., Ltd., made a report on "Several studies on energy-saving renovation of existing buildings (glass curtain walls)" in a recent seminar. He believed that glass curtain walls are decorative envelope projects, and because they were applied earlier than management, they were first used in the project and then improved the standards and regulations, so there were problems related to safety and energy saving. The comprehensive renovation of these buildings will be the main task in the next few years. Experts suggest that economic, reasonable and feasible renovation schemes can be designed for different building types, and the design and renovation scheme should pay attention to "cost performance". For commercial buildings with existing single-layer glass curtain walls, it is better to adopt window film method; Shading technology can be used to reduce consumption in the reconstruction scheme of office buildings. Architectural glass with different properties can also be selected according to different orientations in the southeast and northwest.

　　　 Actually, giving it to window film is a relatively simple and easy way. At present, the thermal insulation safety film on the market can save energy by more than 15%, and it can be stuck on the glass, even if the glass is broken, it can prevent the "glass rain". Sun Jianping, deputy director of the Municipal Construction and Transportation Commission, said that it has become an important part of the renovation of the glass curtain wall in Shanghai to put a thermal insulation safety film on the original glass to reduce energy consumption. However, some experts expressed concern about the prospect of renovation. "The idea of attaching a thermal insulation safety film to the original glass has been put forward for ten years, but it is not so easy to implement." "The price of more than 100 yuan per square meter is not acceptable to everyone." (Li Jicheng/Oriental Morning Post)
　

Editor: Xiu Rongteng