No matter where, are the main source of energy consumption in buildings. <br>Existing buildings account for about 30% of global final energy use, accounting for 28 percent of greenhouse gas emissions related to energy. <br>European Union (EU) has been identified as the existing building stock is the biggest energy-saving potential of a single industry. <br>Retrofitting existing buildings is widely considered to solve the energy crisis and climate change in which a useful method. <br>One of the core functions of any commercial office building is to provide a place for people to work. <br>People spend an average of 40 hours a week in the work environment. <br>Comfort and air pollution exposure are the two key factors affecting the health and productivity of the work environment.
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