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A platform for research: civil engineering, architecture and urbanism
Performance of smart glazed overhang systems for US residential buildings
Abstract In this paper, the application of smart glazing systems as shading devices is evaluated for US residential buildings. Specifically, static and dynamic overhangs are considered using smart glazing that can change their tint state to reduce the heating and cooling thermal loads for prototypical housing units in high-rise apartment buildings. The tint settings as well as the overhang tilt angles are specified on hourly, daily, and monthly basis depending on the window orientation and the time of the year to minimize the annual energy demand for the housing units. The performance of smart glazed overhang systems is compared to both static and dynamic shading devices made-up of conventional opaque materials. In addition, the impacts of various design and climatic conditions are considered to assess the energy performance of the smart glazed overhangs. The results of the analysis indicate that the annual energy consumption for existing housing units with conventional windows located in Boulder, CO, can be reduced by over 7% for static smart glazed overhangs and by over 22% for dynamic smart glazed overhangs. These savings are even higher with larger windows and wider differentials between optical properties between clear and dark states. The smart glazed overhangs allow the use of low-cost smart glazing as a retrofit measure for existing buildings. Moreover, the smart glazed overhangs allow the specification of large windows for new constructions with limited energy penalties.
Highlights The energy performance of smart glazed overhangs is investigated for housing units. Optimal controls are used to maximize the energy efficiency of the smart shades. Switching of smart shades can be optimized on hourly, daily, or monthly basis. Smart shades reduce energy demand up to 22% compared to unshaded clear low-E glazing.
Performance of smart glazed overhang systems for US residential buildings
Abstract In this paper, the application of smart glazing systems as shading devices is evaluated for US residential buildings. Specifically, static and dynamic overhangs are considered using smart glazing that can change their tint state to reduce the heating and cooling thermal loads for prototypical housing units in high-rise apartment buildings. The tint settings as well as the overhang tilt angles are specified on hourly, daily, and monthly basis depending on the window orientation and the time of the year to minimize the annual energy demand for the housing units. The performance of smart glazed overhang systems is compared to both static and dynamic shading devices made-up of conventional opaque materials. In addition, the impacts of various design and climatic conditions are considered to assess the energy performance of the smart glazed overhangs. The results of the analysis indicate that the annual energy consumption for existing housing units with conventional windows located in Boulder, CO, can be reduced by over 7% for static smart glazed overhangs and by over 22% for dynamic smart glazed overhangs. These savings are even higher with larger windows and wider differentials between optical properties between clear and dark states. The smart glazed overhangs allow the use of low-cost smart glazing as a retrofit measure for existing buildings. Moreover, the smart glazed overhangs allow the specification of large windows for new constructions with limited energy penalties.
Highlights The energy performance of smart glazed overhangs is investigated for housing units. Optimal controls are used to maximize the energy efficiency of the smart shades. Switching of smart shades can be optimized on hourly, daily, or monthly basis. Smart shades reduce energy demand up to 22% compared to unshaded clear low-E glazing.
Performance of smart glazed overhang systems for US residential buildings
Krarti, Moncef (author)
Building and Environment ; 208
2021-11-26
Article (Journal)
Electronic Resource
English
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