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Using solar screens in school classrooms in hot arid areas: The effect of different aspect ratios on daylighting levels

Kotbi, Ahmad, Ampatzi, Eleni and Jenkins, Huw 2017. Using solar screens in school classrooms in hot arid areas: The effect of different aspect ratios on daylighting levels. Presented at: 33rd PLEA International conference: Design to Thrive, Edinburgh, Scotland UK, 3-5 July 2017. Published in: Brotas, L., Roaf, S. and Nicol, F. eds. PLEA 2017 Proceedings - Design to Thrive. Passive and Low Energy Architecture Conference Edinburgh: Network for Comfort and Energy Use in Buildings, pp. 3253-3260.

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Hot arid areas are endowed with an abundance of clear skies. Thus, the solar energy available can significantly raise the temperature of interior spaces and also result in an uncomfortable visual environment. External perforated solar screens have been used to control solar penetration through windows. Such screens can also serve a social function, that of maintaining privacy. This paper focuses on a special case of girls’ schools in Saudi Arabia, where the privacy issue is critical due to socio-cultural and religious beliefs. Windows in girls’ schools facing public spaces are typically covered by dark opaque film to maintain privacy. This window treatment results in overreliance on artificial lighting, and in a corresponding increase in energy use. The performance of screens can be affected by many parameters, namely: perforation rate, depth ratio, shape, reflectivity of colour, aspect ratio of openings. This paper looks at how different Aspect ratios affect the performance of screens by simulating a range of cases of different aspect ratios, using the Daylight Dynamic Performance Metrics approach (DDPM). Results recommend using 1:1 aspect ratio for the south orientation whereas using different aspect ratios for the North and West orientations provide better daylight levels in the studied context.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Architecture
Subjects: N Fine Arts > NA Architecture
Uncontrolled Keywords: Daylight, Perforated Solar Screens, Schools, windows, Daylight Dynamic Performance Metrics
Publisher: Network for Comfort and Energy Use in Buildings
ISBN: 9780992895754
Funders: King Saud University
Related URLs:
Date of First Compliant Deposit: 29 September 2017
Last Modified: 06 Jan 2021 02:39

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