"many airports and railway stations use glass domes, as if the lighting has improved, but whether it is energy-saving or energy-consuming, I really hope the construction industry can think about it." recently, the CCTV news channel Newsweek released a small video. Bai Yansong issued a "torture" in the program ". The waiting hall of Beijing South Railway Station adopts an arched glass roof, and the sun can directly shine into the hall, which makes the temperature of the waiting room rise. In addition, there are a large number of passengers in Beijing recently, and the passenger flow at the railway station has increased. Even if the air conditioner is fully opened in the station, the cooling effect is still not good. In response to this situation, Beijing South Railway Station had to take temporary measures to add umbrellas to assist passengers in cooling. But the temporary use of sunshade can't cover everyone's thinking about this architectural form. Is the architectural form of glass dome energy-saving and heat-insulating? Does the practicality of this architectural form meet the expectations of the public?
Figure 1: Waiting Hall of Beijing South Railway Station
obviously, the answer is a little disappointing. According to a senior practitioner of architectural design, these problems are actually the contradictions of building energy-saving design. In the design field of some public buildings, in order to meet the aesthetic needs and reduce lighting power consumption, a large number of glass light-transmitting materials are used in the design of ceilings and roofs, but this also leads to the situation that air conditioners are still stuffy when they are fully powered in public buildings in summer, which also makes designers in a dilemma.
as everyone knows, with the development of new materials, it is not difficult to solve this problem.
Chinaaerogelleader Aibiai and has paid attention to this problem several years ago, and its aerogel insulating glass has been proved to be a good solution to the insulation problem of such glass buildings. Traditional insulating glass by increasing the thickness of the glass, filling inert gas, multi cavity technology, low radiation coating and other technologies to achieve insulation, and aerogel glass is achieved by the material itself very low thermal conductivity, so compared to other types of energy-saving glass, aerogel glass to achieve a light glass, building energy saving and comfortable balance.
Figure 2: Aibiai and Clear Aerogel Glass
is gratifying that on April 1, 2023, the "Aerogel Hollow Glass" (JC/T 2669-2022) industry standard jointly compiled by the Building Materials Industry Technical Information Research Institute and Aibiai New Materials Co., Ltd. was officially implemented. This standard provides standards and basis for the design, construction and acceptance of aerogel hollow glass in the construction field.
Figure 3: Aerogel insulation glass in the field of large-scale engineering applications in Europe and the United States.
aerogel glass is a glass product in which two or more pieces of glass are evenly separated by effective support, the middle is filled with light and transparent silica aerogel material with super heat insulation, and the periphery is bonded and sealed. According to the classification of optical properties, the aerogel hollow glass can be divided into two kinds of transparent aerogel hollow glass and transparent aerogel hollow glass. The transparent type is that the light is transmitted through the scattering mode, and the transparent type is that the light is mainly transmitted through the regular transmission mode.
transparent aerogel hollow glass can reach 0.15, and the heat transfer coefficient K value can be as low as 0.75W/(㎡.K); The visible light transmittance of transparent aerogel hollow glass can reach 0.60, and the heat transfer coefficient K value can be as low as 0.45W/(㎡.K). Both kinds of glass have good resistance to ultraviolet radiation, and the surface has no traces of fog, no water vapor condensation or pollution, no significant discoloration and no obvious deformation of the sealant.
Aibiai and is actively promoting the application of aerogel insulation in the construction field. Aerogel glass is one of the key applications in this field. It is believed that in the near future, no matter Beijing South Railway Station or other public buildings and office places will no longer be troubled by the sunshine radiation heat from the glass dome and wall surface, allowing users to live, study and work more comfortably while enjoying the sunshine.
