A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Improving Buildings' Energy Performance by Defining Optimum Shape Geometry of Sun-Breakers Window Shading
Sun-breakers are commonly used as external shading devices in buildings. They are composed of protruding surfaces around window edges to block solar rays from entering into the spaces to reduce energy cooling loads Good design of sun-breakers blocks solar rays during hot summer months to reduce cooling load, while passes them during cold winter season to decrease heating load. However, this design method may be over-simplified for global use. There are many locations where winter solar access generates cooling loads. Also, months that are similar in solar path location -e.g. August and April- cannot be similarly treated, as their climatic thermal conditions are different. Current design methods may use geometrical analytic Approaches to design sun Breakers, others are based on energy saving, usually are search methods. This paper reports on a research that aims at enhancing current methods for defining the optimum shape geometry of sun breakers. By providing energy based cut-off date that can be used with geometrical methods for design of shading devices for each geographical location. Cut-off date is defined according to optimum annual energy performance, including heating and cooling, and lighting loads. The energy performance of a typical building space was modeled using Energy Plus software. Sun breaker edge profiles were defined to fit around this window by geometric modeling of the solar rays for monthly time periods. Annual energy performance of series of edge shapes was simulated. The optimum edge profiles and cut off months and hours were defined for different locations. Results demonstrate that the cut-off date depends on both Latitude and climatic Conditions, using the method can lead to the design of sun breakers with significant energy savings.
Improving Buildings' Energy Performance by Defining Optimum Shape Geometry of Sun-Breakers Window Shading
Sun-breakers are commonly used as external shading devices in buildings. They are composed of protruding surfaces around window edges to block solar rays from entering into the spaces to reduce energy cooling loads Good design of sun-breakers blocks solar rays during hot summer months to reduce cooling load, while passes them during cold winter season to decrease heating load. However, this design method may be over-simplified for global use. There are many locations where winter solar access generates cooling loads. Also, months that are similar in solar path location -e.g. August and April- cannot be similarly treated, as their climatic thermal conditions are different. Current design methods may use geometrical analytic Approaches to design sun Breakers, others are based on energy saving, usually are search methods. This paper reports on a research that aims at enhancing current methods for defining the optimum shape geometry of sun breakers. By providing energy based cut-off date that can be used with geometrical methods for design of shading devices for each geographical location. Cut-off date is defined according to optimum annual energy performance, including heating and cooling, and lighting loads. The energy performance of a typical building space was modeled using Energy Plus software. Sun breaker edge profiles were defined to fit around this window by geometric modeling of the solar rays for monthly time periods. Annual energy performance of series of edge shapes was simulated. The optimum edge profiles and cut off months and hours were defined for different locations. Results demonstrate that the cut-off date depends on both Latitude and climatic Conditions, using the method can lead to the design of sun breakers with significant energy savings.
Improving Buildings' Energy Performance by Defining Optimum Shape Geometry of Sun-Breakers Window Shading
el Zafarany, Abbas (author) / Sherif, Ahmed (author) / El-Deeb, Khaled (author) / Aly, Mohamed (author)
International Conference on Sustainable Design and Construction (ICSDC) 2011 ; 2011 ; Kansas City, Missouri
ICSDC 2011 ; 324-334
2012-01-04
Conference paper
Electronic Resource
English
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