Sorooshnia, E; Rashidi, M; Rahnamayiezekavat, P; Rezaei, F and Samali, B (2023) Optimum external shading system for counterbalancing glare probability and daylight illuminance in sydney's residential buildings. Engineering, Construction and Architectural Management, 30(1), pp. 296-320. ISSN 0969-9988
Abstract
Purpose: Optimisation of daylight admission through window is crucial for alleviating glare while maintaining useful daylight levels in order to enhance occupants' health, visual comfort and moderating lighting energy consumption. Amongst various solutions, fixed external shade is an affordable solution for housing spaces that need to be sophisticatedly designed, especially during the period of increasing home spaces as working environments. In the humid subtropical region, daylight control plays an important role in indoor comfort, particularly with areas with a high window to wall ratio (WWR). Due to the insufficient amount of such study on non-office spaces in Australia, shading-related standards are not addressed in Australian building codes. Design/methodology/approach: The chosen methodology for the research is a quantitative data collection and analysis through field measurement and simulation simultaneously. The first step is a multi-objective optimisation of shading elements through a non-dominated sorting genetic algorithm (NSGA-II) on parametric modelling via Rhino3D CAD and simulation engines (DIVA and ClimateStudio). In the second phase, the Pareto front solutions are validated by experimental measurements within a room with a single north-facing window (the most probable for the daytime glare in Sydney) for the seven most common local window configurations. Findings: Through the simulation of ten genes, 1,560 values and 2.4 × 1,019 of search space, this study found an optimum shade for each local common window layout, resulted in +22% in (UDI) and −16% in views with discomfort glare on average. Moreover, an all-purpose polygonal shade showed an average of 4.6% increase in UDI and a 5.83% decrease in the percentage of views with discomfort glare. Research limitations/implications: The findings are subject to the room dimensions, window dimensions and layouts, and orientation of windows for selected residential buildings in Sydney. Originality/value: The study contributes to the development of highly accurate fixed external shading systems with rectangular and tapered-form external shapes. A real-time measurement by luminance-metre sensors and HQ cameras located at six eye levels is conducted to corroborate simulation results of the visual comfort.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | daylight glare probability; external shade; multi-objective optimisation; useful daylight illuminances |
| Index terms: | discomfort, Australia, field-measurement, illuminance, office space, residential building, modelling, visual comfort, dimension, multi-objective optimization, energy consumption, shade, glare, window-to-wall ratio, comfort, genetic algorithm, building code, shading, housing, methodology, subtropical region, window, configuration, useful daylight illuminance |
| Subjects: | data collection methods, construction type, analytical methods, health monitoring assessment and metrics, energy systems, electrical systems, Geography, algorithms, research methods, energy efficiency, health risk and incident analysis, physical geography and landforms, architectural elements, design elements, building design, systems engineering, environmental engineering, regulatory law, building performance, occupational health and safety management |
| Topics: | Health and Safety, Geographical Context, Research Practice, Engineering Principles, Construction Technology, Sustainability, Design Practice, Legal Issues, Digital Applications |
| Descriptive scope: | 5 PCTEA |
N.B. Descriptive scope is a count of how many of the five facets of empirical research are indicated by the words used in title, abstract and keywords. It is not intended as a judgement on the research; merely a count of the kind of word we would expect to indicate Phenomenon, Concepts, Theoretical framing, Empirical techniques, Analytical techniques. If all five are present, then a code of “5 PCTEA” will indicate this. If you feel the coding for this record is questionable, we welcome discussion around the terms we matched or the way we categorized them. The facet you would expect may not be coded, or a facet may be coded inappropriately. This can also bear on a larger question, of which facets should be treated as defining in construction management research. Please get in touch, and we will look at it. More details here