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VO2 Thermochromic Smart Window: from Energy Savings to Electricity Generation
Keywords: Energy Savings, Thermochromic, VO2
The ability to achieve energy saving in architectures and optimal solar energy utilisation affects the sustainable development of the human race. Most efforts to efficiently utilise solar energy have been focused on improving the efficiency in the conversion and storage using solar cells and large capacity batteries, respectively. However, these cells, which have been used on housetops and wall periphery, could not be integrated into windows that require the material to be transparent. Traditionally designed energy-saving windows, such as electrochromic thermochromic, and gasochromic, typically function by exterior stimuli involving either an electric field, heat stimulus or a gas. It is not possible to alter the optical performance, which involves intelligently passing or blocking solar energy in response to environmental changes, and simultaneously generate electricity. Traditional smart windows and solar cells cannot be combined into one device for energy saving and electricity generation. A VO2 film can respond to the environmental temperature to intelligently regulate infrared transmittance while maintaining visible transparency and can be applied as a thermochromic smart window. Herein, we discuss for the first time a novel VO2-based smart window that partially utilises light scattering to solar cells around the glass panel for electricity generation. This smart window combines energy-saving and generation in one device, and offers potential to intelligently regulate and utilise solar radiation in an efficient manner.
Yanfeng Gao,
Shanghai University
Baoshan, Shanghai

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