The influence of window orientation on daylight penetration: A simulation-based study in Lahore
Keywords:
Analysis software, Orientations, Illuminance quantity, Window parameters, DemonstratesAbstract
The research deploys Velux daylight analysis software to analyse daylight performance across north, south, east and west orientations using a 6' x 7'-6" double-glazed window. The research examines three fundamental daylight parameters between daylight factor, illuminance quantity and uniformity ratios in order to identify optimal window positioning for daylight optimization and indoor comfort management.
The research shows south-looking windows enable maximal daylight entrance through reaching a daylight factor of 6.90% and peak illuminance levels of 690 Lux. North exposure windows provide a stable illumination with 142 Lux lighting that makes them optimal for situations needing uniform natural light. The daylight peak occurs first in east-facing windows but west-facing windows reach it during afternoon hours causing discomfort because of strong brightness. The investigation shows double-glazed windows function as an effective solution to enhance daylight quality together with reduced heat gain and decreased brightness levels.
The study demonstrates that building windows strategically affect daylight performance while cutting back on artificial illumination and creating better building conditions. The study provides essential knowledge to help architects build sustainable residential buildings that achieve improved daylight autonomy with urban planners.
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Ahmed, S., Khan, M., & Raza, T. (2023). Optimizing window-to-wall ratio for daylighting performance in residential buildings. Energy and Buildings, 285, 112943. https://doi.org/10.1016/j.enbuild.2023.112943.
Al-Masrani, S., GhaffarianHoseini, A., & Berardi, U. (2023). Daylighting strategies in residential architecture: A review of window placement and design. Journal of Building Performance, 45(2), 112-127
Alwetaishi, M. (2022). Impact of double-glazed windows on daylighting and indoor visual comfort in hot climates. Building and Environment, 207, 108503. https://doi.org/10.1016/j.buildenv.2022.108503
Bodart, M., & De Herde, A. (2022). Shading strategies for daylight optimization in residential buildings: A simulation study. Solar Energy, 245, 93-108. https://doi.org/10.1016/j.solener.2022.05.004
Chirarattananon, S., Chaiwiwatworakul, P., & Pattanasethanon, S. (2022). The effect of window-to-wall ratio on daylight autonomy and energy savings in tropical climates. Energy Reports, 8, 1451-1464. https://doi.org/10.1016/j.egyr.2022.05.012
Dubois, M. C., & Flodberg, K. (2021). Daylight performance and occupant well-being in residential spaces. Journal of Sustainable Architecture and Engineering, 37(1), 5468.
Fernandez, J., Smith, P., & Lee, T. (2023). Advancements in daylight simulation: Evaluating the accuracy of Velux software for daylight performance assessment. Building Simulation, 16(3), 489-502.
Ghiabaklou, Z., & Fard, A. (2023). Comparing daylight simulation tools for residential buildings: A case study of Velux software performance. Journal of Architectural Science, 41(2), 212-229.
González, C., & Groat, L. (2021). Illuminance levels and daylight factor analysis: A comparative study of residential spaces using Velux software. Building Research & Information, 49(6), 721-739.
Hammad, F., & Abu-Hijleh, B. (2021). The role of daylight in occupant satisfaction and productivity in residential environments. Sustainable Cities and Society, 68, 102777. https://doi.org/10.1016/j.scs.2021.102777
Hassan, A., Patel, R., & Kumar, S. (2023). Smart glazing technologies for adaptive daylight control in residential buildings. Energy & Buildings, 294, 110021.
Janssen, P., & Wittkopf, S. (2022). Daylight prediction accuracy: A comparative analysis of simulation tools and real-world measurements. Building and Environment, 211, 108718.
Jones, C., Lee, R., & Park, J. (2023). Daylight autonomy and uniformity in residential buildings: The impact of window placement. Renewable Energy, 189, 221-237.
Kim, H., & Kim, J. (2021). Visual comfort and daylight quality in residential buildings with different glazing types. Journal of Environmental Engineering, 147(4), 87-104.
Khan, A., & Ahmed, M. (2023). Daylight penetration in Lahore’s residential spaces: A Velux-based simulation study on window orientation. Journal of Sustainable Architecture, 52(1), 39-56.
Lee, D., & Kim, Y. (2023). Optimizing window dimensions for daylight distribution in deep-plan residential buildings. Energy and Buildings, 267, 112489.
Li, D., & Lam, J. (2022). Impact of window orientation on daylight penetration in urban apartments. Building Simulation, 15(4), 1019-1035.
Mahdavi, A., & Mohammadi, M. (2023). The role of seasonal variations in daylight efficiency for different window orientations. Energy and Buildings, 287, 112963.
Martins, B., & Carneiro, A. (2022). Daylight autonomy assessment in residential buildings using Velux software: A case study approach. Architectural Science Review, 65(2), 189-203.
Nielsen, P., Pedersen, C., & Andersen, M. (2023). Enhancing daylight performance in residential buildings: A study on optimal window-to-wall ratios. Journal of Lighting Research and Technology, 55(3), 244-258.
Patel, R., & Singh, K. (2023). Double-glazed windows and their impact on daylight spread in residential spaces. Solar Energy, 253, 198-210.
Rahman, H., Alvi, N., & Bashir, S. (2023). Seasonal daylight performance analysis for different window orientations in Lahore’s residential sector. Building Performance, 30(1), 17-34.
Reinhart, C., & Andersen, M. (2020). The influence of daylight-responsive lighting controls on energy savings and visual comfort. Lighting Research & Technology, 52(5), 491-505.
Reinhart, C., & Wienold, J. (2022). Glare control strategies for optimizing daylight autonomy in residential buildings. Building and Environment, 212, 108731.
Santos, J., Marques, F., & Rocha, P. (2023). Advances in light-diffusing coatings for daylight optimization in urban residential buildings. Energy Reports, 9, 675-689.
Sharma, P., Verma, D., & Roy, A. (2023). Impact of optimal window orientation on daylight penetration and occupant comfort. Renewable Energy, 191, 237-251.
Smith, T., Patel, K., & Johnson, M. (2023). Daylight performance evaluation in dense urban apartments: A case study on window sizing and orientation. Building Research & Information, 51(4), 315-332.
Tzempelikos, A., & Athienitis, A. (2020). Integration of daylighting strategies in building design: A review of simulation techniques and field studies. Energy & Buildings, 212, 109763.
Wang, Y., Chan, C., & Liu, H. (2023). Daylight exposure and its impact on human wellbeing in residential spaces: A review of recent studies. Journal of Environmental Psychology, 83, 101869.
Zhang, W., Li, H., & Sun, Y. (2023). Optimizing daylight uniformity through window size and placement strategies in residential buildings. Journal of Building Engineering, 58, 106530.
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Copyright (c) 2025 Sarfraz Ahmad, Umer Mahboob Malik, Kashif Riaz, Faizan Saeed (Author)
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