A comparative study of various daylighting systems in office buildings for improving energy efficiency in Egypt

The results of conducting a comparative study of various DLS in Office Buildings in Egypt include identifying optimal alternatives for improving energy efficiency. Results indicate that HSD and HST, whether individually or collectively, can achieve the highest savings, with a reduction of 40% in the energy consumption of cooling and lighting, while HLE saves 38% and HBI saves 24% of the energy consumption for cooling and lighting. The paper concludes with a developed guide to be used by building designers at the conceptual design stages to improve energy efficiency of buildings by selecting and integrating the most appropriate DLS based on building conditions and designers' preferences of façade design.