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Title: Selecting Optimum Window Shading Devices for Sustainable Design and Better Built Environment: Case Study of a Sidelight Office in a Hot Climate
Authors: Faris Aba-alkhail 
Supervisor: Dr. Adnan Al-Anzi
Degree Awarded: Master’s Degree in Architecture
Keywords: shading devices : genetics algorithms : energy savings : windows : office buildings.
Issue Date: 2019
Publisher:  Kuwait university - college of graduate studies
Abstract: Buildings’ claimed to be the main energy consumer among other sectors. They consume nearly 40% of the annual world energy, and more than 50% of annual energy consumption in hot climate regions. Windows’ elements such as glazing materials, frame size, and shading devices are mostly responsible for controlling heat energy transfer in and out of a building. This research aims to minimize energy consumption due to unshaded windows without having to sacrifice the daylighting performance of an office building. Three types of external window attachments were investigated to be optimized (overhang with sided-fin, louvers, and simple overhang) in the four main orientations (East, West, North, and South). The manipulated design variables were the overhang projection, which is limited to half of the window height, overhang inclination with maximum 45° from its original horizontal position, and the sided fins projection, which is limited to half of the window width. A “state-of-the-art” building simulation program, EnergyPlus, was linked with an evolutionary optimization algorithm (Genetic Algorithm) to search for the optimum solutions in each main orientation. As the nature of the evolutionary optimization algorithms, a set of solutions is the final output. The total energy consumption (heating, cooling, and lighting) was the base to compare among the final optimum solutions since the internal loads kept constant. The best of each window attachment type in each main orientation were subjected to further daylighting assessment. A climate-based daylighting assessment based on RADIANCE engine using DIAL+ software, was utilized to analyze the daylighting performance among the optimum solutions. It was concluded from this study that the three most common types of external window attachments (overhang with sided-fin, louvers, and simple overhang) save energy of 27%, 25%, and 24% respectively in the East façade. Overhang with sided-fin is the best performing window attachment type for the West and South with 28% and 36% energy saving respectively. Both overhang with sided-fin and simple overhang were the best in terms of overall daylighting performance in the West. The overhang with sided-fin is the best for the South in both; total energy savings and daylighting performance. North orientation, however, was the less affected with window shading (14% total energy saving). Thus, No further daylighting analysis was conducted in the North orientation. In sum, this study provides a guideline to the office building owners and practitioners to better help them choosing the best window attachment for each orientation based on window dimensions.
Appears in Programs:1610 Architecture

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