Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Veiled Facades: Impacts of Patterned-Mass Shades on Building Energy Savings, Daylighting Autonomy, and Glare Management in Three Different Climate Zones

Ihab M.K. Elzeyadi1, Ayesha Batool2
1Professor of Architecture, University of Oregon, Eugene, Oregon, USA
2Assistant Professor, National University of Sciences and Technology, Islamabad, Pakistan

Abstract: Patterned massive screen shading systems are traditionally applied to vernacular buildings’ facades in hot climates to provide protection from direct solar radiation and regulate social interaction. These screens are traditionally constructed from stone or massive materials and have geometric motifs and patterns with deeper profiles than lattice or solar-screens. While the impacts of light-weight solar-screens systems on building energy use and daylighting distribution have been previously investigated, there is a current gap in knowledge related to the impacts of other screen types on building energy use, thermal comfort, visual comfort, glare management, and dynamic daylighting metrics from a holistic approach of energy performance and occupants’ multi-comfort perspective. By employing a combination of field measurements and dynamic yearly computer simulations using IES-VE software, this study compares the performance of patterned massive-screens, such as Jali systems with three different traditional geometries and for three different hot climate zones; hot-humid, hot-arid, and hot-moderate. Results show that perforation geometries and patterns differ in their performance from one hot climate zone to the other. While a 30% perforation ratio achieved a better thermal comfort in hot-arid climate, it was under performing in hot-humid climate and have lower impacts in hot-moderate climate. The paper highlights different performance results to aid future designs of screen pattern and perforation for future buildings based on an evidencebased metrics. In addition, it sheds light on the importance of learning from vernacular precedents without over generalizing and romanticizing their performance.
Pages: 2651 - 2660