WO3 is an electrochromic material, so tungsten trioxide film can be used to assemble a new type of large area electrochromic glass. But do you know what the future of large-area electrochromic glass is?
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In recent years, the requirements for energy conservation in the construction industry have been further improved in various developed countries. For example, in the European Union's building standards, the energy efficiency requirement for external windows is that the heat transfer coefficient U value is less than 1.3W/(m2?K). The requirement for the German external window is that the U value is equal to or less than 1.0W/(m2?K). Switzerland has the most stringent requirements, with an U value of no more than 0.7W/(m2?K). The energy-saving window technology in the United States has evolved from a simple double-glazed window in 1973 to a low-E glass technology since 2003. The average heat transfer coefficient has dropped from 4.8W/(m2?K) to 2.5W/(m2?K). It is estimated that around 2030, the US Green Energy First Class Energy Star standard will achieve the goal of “zero energy consumption in winter and 80% reduction in summer energy consumption”. For this reason, the average heat transfer coefficient of the window must be less than 0.6W/(m2?K). And China, which has an average building energy consumption more than three times that of developed countries, needs to raise energy-saving requirements for the construction industry. This means that high-performance energy-saving glass such as tungsten trioxide large-area electrochromic glass will have a broad market.
