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Glass Curtain Wall is test useing Intelligent coating to save energy and reduce carbon dioxide emissions.

Glass Curtain Wall

Fraunhofer researchers have developed an intelligent coating for glass windows that darken in the sun. This layer uses electrochromic and thermochromic materials that react to electricity and heat. In buildings with large glass curtain walls, it can prevent rooms from overheating due to solar radiation, thereby reducing the demand for energy intensive air conditioning.

Smart coating glass curtain wall

Construction industry is one of the major emission factors of greenhouse gases. According to the data of German Environment Agency, buildings account for 30% of carbon dioxide emissions and 35% of energy consumption in Germany. Among them, buildings with large glass curtain walls and glass roofs, such as office buildings with glass curtain walls, will become hot in summer under the sun, and shading through shutters will interfere with vision and reduce aesthetic feeling, so they are not popular. Only air conditioners can be used for cooling, which requires a lot of electricity and increases carbon emissions.

Construction industry is one of the major emission factors of greenhouse gases. According to the data of German Environment Agency, buildings account for 30% of carbon dioxide emissions and 35% of energy consumption in Germany. Among them, buildings with large glass curtain walls and glass roofs, such as office buildings with glass curtain walls, will become hot in summer under the sun, and shading through shutters will interfere with vision and reduce aesthetic feeling, so they are not popular. Only air conditioners can be used for cooling, which requires a lot of electricity and increases carbon emissions.

In addition, Dr. Marco Schott explained that when a certain ambient temperature is reached, the coating will reflect the thermal radiation of the sun. The sensor can be used to measure factors such as brightness and temperature, and send the results to the control system. At the same time, the guide film sends current or voltage pulses to darken the window. When the temperature or brightness is too high, the glass surface will gradually darken. It can prevent the room from overheating and reduce the use of air conditioning. It can also play an anti glare role.

Fraunhofer researchers also considered whether the technology was suitable for daily use. Electrochromic films only need electricity in the conversion process, and the extremely low voltage is enough to start the coloring process. Thermochromic materials do not need electricity, but react to the heat generated by the sun. They can be used to supplement switchable systems or as an alternative.

Dr. John fahlteich, coordinator of the switch2save project and head of the research group, explained that in warm areas, the cooling and heating energy demand of modern glass curtain wall buildings can be reduced by as much as 70%. In colder northern areas, the cost saved is not large, but it can be used as anti glare protection to prevent direct sunlight. By using it, architects and developers can provide personalized solutions for various areas and buildings. The technology was installed in the pediatric clinic of the second largest hospital in Athens, Greece, and the office building in Uppsala, Sweden. In these two buildings, energy consumption will be monitored and compared throughout the year before and after the installation of new windows. By doing so, we can show the actual performance of switch2save technology, and we can continue to test and improve the technology for different climatic regions. Electrochromic and thermochromic switchable components are only a few hundred microns thick, less than 500 grams per square meter. It hardly adds weight to the windows, and they can be retrofitted in existing buildings without changing the building structure. World warming and the European Green agreement will increase the demand for energy-saving building technology in the next few years – it is expected that all buildings in the EU will be carbon neutral by 2050. Electrochromic and thermochromic windows can make an important contribution to this.

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