Global warming and changing climatic conditions, as well as over-consumption of energy resources have led to the discussion of sustainable and energy-efficient approaches. The buildings have one of the most significant roles in over-energy consumption causing various global effects. Therefore, the importance of developing energy-efficient and energy-retrofit strategies in buildings has been increasing day by day. This study aims to introduce a sustainable lighting system design approach for new and refurbished buildings in terms of visual comfort and energy performance in accordance with the current standards. "TS EN 12464-1:2013 Light and lighting-Lighting of workplaces-Part 1: Indoor workplaces", which describes basic requirements for visual comfort and "TS EN 15193-1:2017 Energy Performance in Buildings-Energy requirements for lighting-Part 1: Specifications", which introduces a renewed and updated methodology to estimate lighting energy performance in buildings are used as the metrics for the approach offering to design sustainable lighting system. Office space for two people is selected as a sample in order to apply the developed approach. Obtaining results demonstrate that the lighting-retrofit design strategies have a great positive impact on visual comfort conditions and energy consumption in the office buildings, where energy use for lighting accounts for a huge proportion of the total energy consumption as well as providing visual comfort conditions is very important.
Promoting the daylight performance that allows to provide visual comfort conditions by minimizing lighting energy consumption is possible with making a balance of window size, glazing type and shading strategy, which are the major design parameters of the daylighting system. Particularly, in high-rise buildings, where large openings enabling higher daylight availability and view out are preferred, the daylighting system becomes a crucial design consideration in terms of ensuring occupants’ visual comfort and improving lighting energy efficiency. This study aims to identify a proper daylighting design solution with regard to window area, glazing type and shading strategy for a high-rise residential building located in Istanbul considering visual comfort and lighting energy efficiency. The dynamic simulations are carried out by DIVA for Rhino version 4.1.0.12. The results are evaluated with the Daylight Autonomy (DA) to detect daylight availability in the space and Daylight Glare Probability (DGP) to describe the visual comfort conditions related to glare. Furthermore, the lighting energy consumption of each alternative is also analysed to determine the proper daylighting solution. The results have revealed that a proper daylighting solution providing visual comfort by improving lighting energy-efficiency can be determined by the evaluation of the daylight performance both qualitatively and quantitatively.
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