Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Multi-objective optimisation of Indian Jaali fenestration system for visual, thermal and perceptual performance using computational methods

Afshan Rehman, Amulya Surapaneni
Carnegie Mellon University, United States of America

Abstract: Jaali is a term used for perforated screens with floral or geometric patterns native to Indo-Islamic architecture. By changing the depth and the size of apertures of the Jaalis, one can reduce glare, solar insolation, achieve unobstructed views and cool breeze. Although individual studies on the impact of Jaalis on daylighting comfort (Batool, 2014) and thermal comfort (Sherif et. al, 2012) exist, no research currently examines how Jaali patterns affect both daylighting and thermal comfort simultaneously. This paper introduces an experimental study to evaluate these concepts by replacing a glass facade in a 3D-model with a Jaali screen. A qualitative sample study was conducted using six Jaali screens to ascertain the Jaali pattern that best improves the quality of light. The most preferred Jaali pattern from the survey was then studied to quantitatively assess its visual and thermal properties. To determine the optimum aperture size and depth of the Jaalis, daylight metrics such as ASE and sDA, and thermal metrics such as annual indoor solar radiation were used.
Keywords: Jaali, Daylight analysis, Thermal analysis
Pages: 2523 - 2528