Abstract
The concept of smart windows that can change the properties of windows and doors in response to external stimuli has recently been introduced. Smart windows provide superior energy savings and control of indoor environments. This concept can advance sustainable architecture, and it will make it possible to connect with the fourth industry, which has developed recently. However, unlike the relevant hardware, is advancing rapidly, research on methods of adjusting smart windows is slow. Therefore, in this study, an analysis of energy use over time was conducted on electrochromic windows, one of the main types of smart windows. Through this analysis, the optimal properties of electrochromic smart windows were identified, and an operation schedule was created. In addition, energy saving rates were derived through a comparison with existing architectural windows.
Highlights
Cooling energy can be saved by blocking solar energy in the summer, and heating energy can be saved by receiving solar energy in the winter
This study aims to analyze the energy performance of an indoor space according to changes in the physical properties of electrochromic smart windows, and to analyze the rate at which energy can be saved by the use of smart windows rather than existing windows
Dussault et al analyzed the sensitivity of energy performance and thermal and visual comfort for office buildings with electrochromic windows [4]
Summary
The cooling, heating and lighting loads in buildings are closely related to solar energy. Smart windows can adjust visible light transmittance (VLT) and solar heat gain coefficient (SHGC). The market for these products is growing rapidly. This study aims to analyze the energy performance of an indoor space according to changes in the physical properties of electrochromic smart windows, and to analyze the rate at which energy can be saved by the use of smart windows rather than existing windows. Since electrochromic glass has a wide VLT range and good g-value control, its use leads to significant energy savings if appropriate values are set according to the season and time. The most efficient electrochromic window operation schedule was determined by calculating the heating and cooling energy load on the spring equinox, summer solstice, autumn equinox and winter solstice, which are representative days of the four seasons. The energy savings rate was analyzed in comparison to existing windows
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