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Journal articles on the topic 'Daylighting performance'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Whang, Allen Jong-Woei, Tsai-Hsien Yang, Zhong-Hao Deng, Yi-Yung Chen, Wei-Chieh Tseng, and Chun-Han Chou. "A Review of Daylighting System: For Prototype Systems Performance and Development." Energies 12, no. 15 (2019): 2863. http://dx.doi.org/10.3390/en12152863.

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Daylighting systems make daylight illuminance possible, and the development of prototype daylighting systems can provide more efficient daylight illuminance. The purpose of this article is to review the development and performance of prototype daylighting systems in the last decade. The passive and active daylighting systems are listed separately and divided into the four categories by the presence and absence of hybrid. Each prototype daylighting system was evaluated in terms of cost and daylight performance and as well as their novel optical design. We evaluated the architecture and daylighting principles of each system by reviewing individual prototype daylighting systems. The cost of prototype systems still poses a challenge to development. How to use passive or active systems in different environments and whether or not electrical lighting assistance is needed is a controversial issue. However, active daylighting systems equipped with solar tracking systems are still mainstream. This research is a valuable resource for daylight researchers and newcomers. It is helpful to understand the advantages of various prototype daylighting systems and commercial daylighting systems that have been developed for many years; moreover, it is also possible to know the research directions suggested by the prototype daylighting systems. These will be of further use in developing innovative and better daylighting systems and designs.

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Hwang, Min-Ku, Jin-Seok Do, and Taeyon Hwang. "Improving Daylighting Performance By Daylighting System In School." Journal of Next-generation Convergence Technology Association 5, no. 3 (2021): 437–43. http://dx.doi.org/10.33097/jncta.2021.05.03.437.

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Wu, Yan Peng, Xiao Dong Wang, Zi Guang Chen, and Chao Ying Zhang. "Experimental Study on the Influence of Daylighting Performance of Solar Light Pipes by Dusts and Condensation." Advanced Materials Research 374-377 (October 2011): 1096–99. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1096.

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Dusts and condensation which exist in the application of solar light pipes can affect daylighting performance. The influence of daylighting performance of solar light pipes by dusts and condensation was studied in this paper. Through measuring daylighting performance of skylight dome on different condensation conditions, it was proved that as the drop’s mean diameter from small to big, the transmitting efficiency is directly proportional to the drop’s mean diameter, and then is inversely proportional to a certain value. Through measuring the overall daylighting performance of solar light pipes on three different conditions—clean, dusts and condensation on sunny and cloudy days, the illuminance flux was obtained. The experimental results indicated that dusts and condensation worsen the daylighting performance of solar light pipes, and dusts had bigger influences than condensation.

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Li, Li. "Research on daylighting optimization of building space layout based on parametric design." Sustainable Buildings 7 (2024): 3. http://dx.doi.org/10.1051/sbuild/2024003.

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Excellent daylighting in buildings is beneficial to protect the physical and mental health of users. After introducing the daylighting of the building, this paper used the genetic algorithm (GA) optimized by co-evolution to optimize the daylighting. Then, a one-story L-shaped accommodation house in Zhengzhou, Henan Province was taken as a case for analysis. The effectiveness of the Daysim software used for calculating the building lighting indicator was tested. Then, the performance of the improved GA with different daylighting indicators as fitness values was compared. Finally, the optimization performance of the particle swarm optimization (PSO) algorithm, the traditional GA, and the improved GA were compared. The results showed that the daylighting indicators simulated by Daysim were significantly correlated with the measured data, suggesting its effectiveness. The improved GA using dynamic daylighting indicators as fitness values had better optimization performance. Compared with the other two algortihms, the improved GA had better optimization performance.

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Ayoosu, Moses Iorakaa, Yaik-Wah Lim, Pau Chung Leng, and Olusegun Moses Idowu. "Daylighting Evaluation and Optimisation of Window to Wall Ratio for Lecture Theatre in the Tropical Climate." Journal of Daylighting 8, no. 1 (2021): 20–35. http://dx.doi.org/10.15627/jd.2021.2.

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A base case model is a more potent dose for applied research; the passive architectural design for sustainability requires optimised experiments. However, experimenting with physical developments require construction and deconstruction until they achieved the optimal scenario. These wastes resources and time; hence, base models' development as useful instruments in the optimisation design process is desirable. Lecture theatres in universities have no specific design model whereby optimising one may not apply to the other. Therefore, this research evaluated a base model for lecture theatre regarding spatial configuration, daylighting potentials, and optimised window-to-wall ratio (WWR) for tropical daylighting. A study of ten existing lecture theatres in eight universities within eight states in Nigeria's hot-humid climate was analysed descriptively for the base model. The study employed Simulations with IES-VE software. The daylighting performance analysis adopted the daylighting rule of thumb, daylight factor, work plane illuminance (WPI), and WPI ratio. The results show that a typical lecture theatre in the study area has a dimensional configuration of 12×20 m floor plan, 6 m ceiling height, and a window wall ratio (WWR) of 13%. In the deduced base model, 4H was required for adequate daylighting against the thumb's 2.5 H daylighting rule. The research concludes a low window-wall ratio with poor daylighting quality and quantities in the base model; therefore, it implies that the daylighting was not a criterion in the designs. However, the experiment revealed a progression in daylighting performance with an increase in WWR from the base case until 30% WWR. Beyond that, there was a decline in the daylighting performance. Therefore, 30% WWR was optimal for daylighting performance in lecture theatre retrofitting within the tropical climate.

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Luo, Jianhe, Gaoliang Yan, Lihua Zhao, Xue Zhong, and Xinyu Su. "Evaluation of Design Parameters for Daylighting Performance in Secondary School Classrooms Based on Field Measurements and Physical Simulations: A Case Study of Secondary School Classrooms in Guangzhou." Buildings 14, no. 3 (2024): 637. http://dx.doi.org/10.3390/buildings14030637.

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The quality of natural lighting within secondary school classrooms can significantly affect the physical and mental well-being of both teachers and students. While numerous studies have explored various aspects of daylighting performance and its related factors, there is no universal standard for predicting and optimizing daylighting performance from a design perspective. In this study, a method was developed that combines measurements and simulations to enhance the design parameters associated with daylighting performance. This approach facilitates the determination of precise ranges for multiple design parameters and allows for the efficient attainment of optimal daylighting performance. Daylight glare probability (DGP), point-in-time illuminance (PIT), daylight factor (DF), and lighting energy consumption were simulated based on existing control parameters of operational classrooms. The simulation results were then validated using field measurements. Genetic algorithms (GAs) were employed to optimize the control parameters, yielding a set of optimal solutions for improving daylight performance. The differences between daylighting performance indicators corresponding to the optimal solution set and those of the basic model were compared to test the performance of the optimized parameters. The proposed method is a robust process for optimizing daylight design parameters based on GAs, which not only enhances daylighting performance but also offers scientifically grounded guidelines for the design phase. It is a valuable framework for creating healthier and more productive educational environments within secondary school classrooms.

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., Abimaje, Joshua ., Mohd Zin Bin Kandar, and Dodo Yakubu Aminu. "Light Shelf as a Daylighting System in a Tropical Climate Office Space." International Journal of Engineering & Technology 7, no. 2.29 (2018): 798. http://dx.doi.org/10.14419/ijet.v7i2.29.14259.

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Daylighting is a passive design strategy for lighting office spaces given the fact that offices operate within daytime, usually between 8:00 am to 5:00 pm which corresponds to the period of daylight availability. Daylight is abundant in the tropics, free and has no negative impact on the environment. It has positive physiological and psychological effect on the man as well as good colour rendering. Ironically, despite the abundant availability and the merits of daylighting especially in the tropics, it is not fully utilized. A light shelf is one of the innovative daylighting systems that can be employed to improve office spaces daylighting performance. Therefore, the focus of this study is the application of light shelf as a daylighting system in government offices in Malaysia. This study was carried out through literature search on thirteen disciplines. The disciplines were building and environment, energy, and building, renewable and sustainable energy, energy conservation in Building, lighting research and technology, energy conservation and Management, Solar energy, renewable energy, indoor and built environment, energy policy, energy and buildings, renewable energy, and applied energy. Data were obtained from Science Direct, Web of Science, Scopus and Conference Proceedings. This was done by typing in keywords such as daylighting, light shelf, office spaces, visual performance, tropical climate, and Malaysia. The review was from 1986 to 2016 to cover the length and breadth of the study area for the past 30 years. This work includes previous review and empirical works. Attention was equally given to the methodologies and context of the work. The result of this study showed the poor daylighting performance of government office spaces in Malaysia. The daylighting in these offices is either too low as a result of the use of excessive external shading devices to reduce interior heat gain or too high due to over glazed wall for aesthetics and daylighting. Consequent upon these is inadequate daylighting illuminance, non-uniform illuminance distribution, and glare. This brings about visual discomfort. Also, the study revealed that light shelf as an innovative daylighting lighting system could improve the daylighting performance of these office spaces. The effectiveness of light shelf depends on the latitude, reflectance of light shelf material, the angle of inclination, its depth, mounting position among others. However, there exists little work on the effect of the depth of light shelf and the variation of its distance from the ceiling on the daylight performance of government office spaces in Malaysia. This paper, therefore, recommends investigation on the effect of the depth of light shelf and the variation of its distance from the ceiling on daylighting performance of government office spaces in Malaysia.

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Shao, L., and J. M. Callow. "Daylighting performance of optical rods." Solar Energy 75, no. 6 (2003): 439–45. http://dx.doi.org/10.1016/j.solener.2003.09.015.

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Li, Danny H. W., S. M. Lo, Joseph C. Lam, and Richard K. K. Yuen. "Daylighting Performance in Residential Buildings." Architectural Science Review 42, no. 3 (1999): 213–19. http://dx.doi.org/10.1080/00038628.1999.9696878.

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Vishnu Priya, P., M. Gnana Priya, E. Mahesh, K. Naga Sai, D. Fareez, and T. Navya Chandrika. "Daylight Performance of an Office Building." E3S Web of Conferences 591 (2024): 09013. http://dx.doi.org/10.1051/e3sconf/202459109013.

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Daylighting plays an important role to enhance the comfort levels for the occupants in the building and also to reduce the usage of artificial lighting during daytime conditions. Excess daylighting of the building increases sun lighting inside the building. Daylighting depends on number of openings provided in each direction of the building and also on wall window ratios. The present study is done for an office building for different orientations with different WWR such as 20%, 25% and 30%. In this study daylight illuminance and day light factor analysis is carried by using daylight simulation in Design Builder. Analysis is done for 12 models. By comparing the analysis, it has been observed that WWR of 25% for all orientation has daylight illuminance value with in desirable ranges when compared to 20% and 30%.

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Effendy, Ethan Josiah, Fahmi Nur Hakim, Atthaillah, Rizki A. Mangkuto, Mochamad Donny Koerniawan, and Dhafira Ramadhani. "Daylight optimization in a hypothetical classroom using single-objective optimization methods: Case study in Lhokseumawe, Indonesia." IOP Conference Series: Earth and Environmental Science 1157, no. 1 (2023): 012002. http://dx.doi.org/10.1088/1755-1315/1157/1/012002.

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Abstract This study evaluates and optimizes daylighting performance in a hypothetical classroom located in Lhokseumawe, Indonesia. The classroom daylighting performance is represented by the metrics aUDI250-750lx, sDA300/50%, and ASE1000,250. Under the baseline conditions, poor daylighting performance was revealed as indicated by a low aUDI250-750lx value and a high ASE1000,250h value. To obtain good daylighting performance, this study utilized a computational simulation method using Rhinoceros, Grasshopper, and Honeybee Plus platforms. Optimization is conducted using Opossum with the RBFOpt algorithm. The optimization result suggests the building envelope design parameters and external shading device design which results in a better natural lighting performance as indicated by the increase of aUDI250-750lx value at about 45%, the sDA300/50% value remaining at around 94%, and the ASE1000,250h value has decreased by 14% compared to the baseline condition of the classroom.

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Wu, Yanpeng, Shaoxiong Li, Xin Gao, and Huifang Fan. "Daylighting Performance of CdTe Semi-Transparent Photovoltaic Skylights with Different Shapes for University Gymnasium Buildings." Buildings 14, no. 1 (2024): 241. http://dx.doi.org/10.3390/buildings14010241.

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The daylighting environment in university gymnasiums affects daily teaching and sports training. However, direct sunlight, glare, and indoor overheating in summer are common problems. Semi-transparent photovoltaic glass can solve these issues by replacing shading facilities, blocking solar radiation, and generating electricity. This study examines the influence of different types of CdTe semi-transparent film photovoltaic glass on the daylighting environment of six typical university gymnasium skylights. The optimal types of CdTe semi-transparent film photovoltaic glass are determined by dynamic daylighting performance metrics DA, DAcon, DAmax, and UDI. The results show that, for instance, centralized rectangular skylights benefit from the 50–60% transmittance type, while centralized X-shaped skylights require the 70–80% transmittance type to enhance indoor daylighting. The research results offer specific recommendations based on skylight shapes and photovoltaic glass types and can provide a reference for the daylighting design of university gymnasium buildings with different forms of photovoltaic skylights in the future.

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Talip, Muhammad Syukri, Mariam Felani Shaari, Sabarinah Sh Ahmad, and Ricardo B. Sanchez. "Optimising Daylighting Performance in Tropical Courtyard and Atrium Buildings for Occupants’ Wellbeing." Environment-Behaviour Proceedings Journal 6, no. 16 (2021): 93–102. http://dx.doi.org/10.21834/ebpj.v6i16.2710.

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Daylighting has attracted increasing attention from researchers as an energy-efficient and sustainable building design technique. This research investigates the daylighting of atrium and courtyard building by comparing the performance of various Window to Wall Ratios (WWR) appropriate to Malaysia's tropical climate. The most acceptable option for daylight performance was to specify a moderate WWR value of 30% with shading devices. The results of The Radiance Daylighting Simulations confirmed the daylight performance by a comparison of calculated data and modelling. The findings show the combinations of daylighting parameters that work for courtyard and atrium buildings for the occupants' wellbeing. Keywords: Daylighting Performance, Courtyard, Atrium, Tropical, Radiance Simulations eISSN: 2398-4287© 2021. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians/Africans/Arabians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI: https://doi.org/10.21834/ebpj.v6i16.2710

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Li, Qinbo, and Jeff Haberl. "Prediction of Annual Daylighting Performance Using Inverse Models." Sustainability 15, no. 15 (2023): 11938. http://dx.doi.org/10.3390/su151511938.

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This paper presents the results of a study that developed improved inverse models to accurately predict the annual daylighting performance (sDA and lighting energy use) of various window configurations. This inverse model is an improvement over previous inverse models because it can be applied to variable room geometries at different weather locations in the US. The room geometries can be varied from 3 m × 3 m × 2.5 m to 15 m × 15 m × 10 m (length × width × height). The other variables used in the model include orientation (N, E, S, W), window-to-floor ratio, window location in the exterior wall, glazing visible transmittance, ceiling visible reflectance, wall visible reflectance, shade type (overhangs, fins), shade visible reflectance, lighting power density (LPD) (W/m2), and lighting dimming setpoint (lux). Such models can quickly advise architects during the preliminary design phase about which daylighting design options provide useful daylighting, while minimizing the annual auxiliary lighting energy use. The inverse models tested and developed were multi-linear regression (MLR) models, which were trained and tested against Radiance-based annual daylighting simulation results. In the analysis, 482 cases with different model conditions were simulated, to develop and validate the inverse models. This study used 75% of the data to train the model and 25% of the data to validate the model. The results showed that the new inverse models had a high accuracy in the annual daylighting performance predictions, with an R2 of 0.99 and an CV(RMSE) of 15.19% (RMSE of 58.91) for the lighting energy (LE) prediction, and an R2 of 0.95 and an CV(RMSE) of 14.38% (RMSE of 8.02) for the sDA prediction. In addition, the validation results showed that the LE MLR model and sDA MLR model had an R2 of 0.96 and 0.85, and RASE of 121.89 and 8.54, respectively, which indicate that the inverse models could accurately predict daylighting results for sDA and lighting energy use.

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YILDIRIM, Semih Göksel, Stuart BAUR, Thomas G. YARBROUGH, and Matthew NIETERS. "Proposed Framework for Daylight-Focused Homes during Design Development." International Journal of Engineering Technologies IJET 8, no. 2 (2023): 77–82. http://dx.doi.org/10.19072/ijet.1261335.

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Solar decathlon is held biannually, and participant universities have a unique chance to locate solar houses on campus as a living lab after the contest. A variety of performance criteria are evaluated during the contest and daylighting is one among them. Complicated analysis tools, design solutions, and their effectiveness are major challenges during the design development of new solar houses. This challenge definition leads to developing a daylighting guideline for new solar house design. To provide a roadmap of validity of emerging daylighting metrics, demonstration of the daylighting performance of built-up solar houses, and daylighting guideline for design parameters with recent technology on new solar house design are the specific objectives of this study. The manuscript aims to examine the existing daylighting design tools while proposing a roadmap for how to use emerging metrics over solar house design. Three solar decathlon entries of Missouri University of Science and Technology are selected for post-occupancy evaluation to verify selected design tools. After analyze method, tools and final products are introduced which can be used on case studies, impact on research and education is discussed in the paper. Experiential method proposal for daylighting design have three phases and these are; the daylight metrics, the daylight performance and impact on research and education. It would be beneficial in the future to have this as a design guide, especially for any residential buildings rather than just solar houses.

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Ayoosu, Moses Iorakaa, Aondover Lawrence Utsaha, Kole Emmanuel Gabriel, Aker Mark Manasseh Vishigh, Memshima Evelyn Tuleun, and Iwua Gabriel Sen. "Daylighting Performance Assessment: A Review of Methodologies." Path of Science 11, no. 1 (2025): 8001. https://doi.org/10.22178/pos.113-16.

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This review assesses various methodologies in evaluating daylighting performance, highlighting their strengths and limitations. Key methods include computer-aided simulations, field measurements, physical scaled modelling, and mathematical calculations. Computer-aided simulations offer detailed and accurate predictions but require specialised skills, resources, and validation for accuracy. Field measurements provide empirical real-time data, though they are resource-intensive and need more time. Physical scaled models offer tangible insights but may lack precision, while mathematical calculations are quick and accessible yet often simplified and applicable to small tasks. However, designers can enhance the efficacy of daylighting assessments by integrating multiple methods, investing in training and tools, prioritising real-world testing, and adapting strategies to local contexts. Continuous monitoring and holistic design approaches are essential for optimising natural light use, improving energy efficiency, and ensuring occupant comfort in sustainable building environments. The review provides a valuable guide for researchers, architects, and engineers in selecting and combining appropriate methodologies for practical daylighting performance assessment.

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Sanusi, Aliyah Nur Zafirah, Ahmad Faisal Abdul Jamil, Fadzidah Abdullah, and Rosniza Othman. "Effective Daylight Design Strategies of Colonial Mosques in Malaysia." Asian Journal of Environment-Behaviour Studies 6, no. 18 (2021): 27–45. http://dx.doi.org/10.21834/ajebs.v6i18.381.

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This study evaluates the effective Daylighting design strategies of Colonial Mosques in Malaysia. There are two objectives, and the first objective is to examine the Daylighting performance of the main prayer hall of three Colonial Mosques in Malaysia. The second objective is to identify effective Daylighting design strategies from the Colonial Mosques in Malaysia. The triangular research methodology was applied for this study. The research methodology consists of literature review, field observation, and Daylighting analysis simulation with Sefaira simulation software. In conclusion, window heights influence the Daylighting performance of the main prayer hall. Higher windows give more effective Daylighting. Keywords: Daylight; Mosque; Colonial; Malaysia. eISSN 2514-751X © 2021. The Authors. Published for AMER ABRA by E-International Publishing House, Ltd., UK. This is an open-access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians/Africans/Arabians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI: https://doi.org/10.21834/ajebs.v6i18.381

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Grace Colaco, Sheryl, Susan G. Varghese, Ciji Pearl Kurian, and Sanjeev Kumar TM. "A state-of-the-art artificial intelligent techniques in daylighting controller: models and performance." Science and Technology for Energy Transition 78 (2023): 37. http://dx.doi.org/10.2516/stet/2023035.

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Lighting designers are always on the quest to develop a lighting control strategy that is aesthetically pleasing, comfortable, and energy-efficient. In an indoor context, electric lighting blended with daylighting controls forms a quintessential component for improving the occupant’s comfort and energy efficiency. Application of soft computing techniques, adaptive predictive control theory, machine learning, HDR photography, and wireless networking have facilitated recent advances in intelligent building automation systems. The evolution and revolution from the 19th to the 21st century in developing daylighting control schemes and their outcomes are investigated. This review summarizes the state-of-the-art artificial intelligence techniques in daylighting controllers to optimize the performance of conventional photosensor-based control and camera-based control in commercial buildings. The past, current, and future trends are investigated and analyzed to determine the key factors influencing the controller design. This article intends to serve as a comprehensive literature review that would aid in creating promising new concepts in daylighting controllers.

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Marzouk, Mai A., and Mostafa Atwa. "Daylighting and Energy Performance of PVSDs;." Scientific Research Journal 8, no. 8 (2020): 69–75. http://dx.doi.org/10.31364/scirj/v8.i8.2020.p0820796.

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Heschong, Lisa, Roger L. Wright, and Stacia Okura. "Daylighting Impacts on Retail Sales Performance." Journal of the Illuminating Engineering Society 31, no. 2 (2002): 21–25. http://dx.doi.org/10.1080/00994480.2002.10748389.

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Littlefair, P. J., M. E. Aizlewood, and A. B. Birtles. "The performance of innovative daylighting systems." Renewable Energy 5, no. 5-8 (1994): 920–34. http://dx.doi.org/10.1016/0960-1481(94)90113-9.

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Mainini, Andrea Giovanni, Andrea Zani, Giuseppe De Michele, et al. "Daylighting performance of three-dimensional textiles." Energy and Buildings 190 (May 2019): 202–15. http://dx.doi.org/10.1016/j.enbuild.2019.02.036.

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Zulkarnain, Aimi Zahirah, Mohd Najib Mohd Salleh, and Zalena Abdul Aziz. "THERMAL-DAYLIGHTING BALANCE THROUGH BUILDING SHADING DEVICES: A REVIEW ON FACTORS AND METHODS." Malaysian Journal of Sustainable Environment 8, no. 3 (2021): 157. http://dx.doi.org/10.24191/myse.v8i3.15894.

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Daylighting is interpreted as natural sunlight allowed into an indoor space. Passive lighting strategies are considered fundamental in achieving a high performing sustainable building, which affects the visual and thermal comfort, and energy performance of a building. Many strategies in controlling daylighting are known, however, the wrong implementation can lead to a negative effect. The results obtained need to reach a balance between daylighting and thermal performance. This review is conducted to analyse the concept and factors that affect the balance through different research parameters. The performance factors include energy, comfort and perception or view. The different methods of achieving the balance are categorized into three, which are parameter relation, combination, and multi-objective optimization. Building shading devices are considered as one of the major solutions to reach thermal-daylighting balance. Through a comprehensive review, adjustable shading control is recommended as a better option for building shading device for buildings to achieve the optimum balance.

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Long, X., Q. Jin, and Q. Sun. "Optimization of the thermal-optical performance of a PCM-integrated thermochromic glazing system." Journal of Physics: Conference Series 2600, no. 9 (2023): 092028. http://dx.doi.org/10.1088/1742-6596/2600/9/092028.

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Abstract Facades that employ adaptive technologies have shown great potential in enhancing building energy efficiency. This study investigates a novel phase-change material integrated thermochromic glazing (PCM-TCG), and applies it on skylights of an exhibition building in Shanghai. Thermal performance and daylighting performance of the building were analysed using Fluent and Grasshopper/Honeybee respectively and they were optimized through Non-dominated Sorting Genetic Algorithm-II. It was found that on summer solstice and winter solstice, the optimized solution provided an excellent trade-off between thermal and daylighting performance, reducing the total energy demand by 88% and increasing the daylighting satisfaction time by 5 hours compared to low-E glazing on summer solstice and winter solstice.

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Al-Ashwal, Najib T., Ahmad Sanusi Hassan, and Yaik-Wah Lim. "DAYLIGHTING PERFORMANCE OF HIGH SCHOOL LEARNING ENVIRONMENT IN TROPICS." Journal of Green Building 18, no. 2 (2023): 191–206. http://dx.doi.org/10.3992/jgb.18.2.191.

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ABSTRACT The quality of the indoor environment, including the lighting conditions, is crucial in classrooms as it directly affects students’ learning performance and productivity. Natural light is the best light source for visual comfort, aesthetics, and energy efficiency. Malaysia is in a tropical region and has abundant daylight availability that could meet the required lighting during the day. However, in Malaysian schools, electric lights are frequently switched on during classes in the daytime; hence, daylighting is not efficiently utilised. This study investigates the daylighting performance in classrooms in a national high school in Penang, Malaysia. Fieldwork was conducted by measuring incident illumination levels inside selected classrooms in the Teluk Kumbar High School. The results show that average illumination levels were between 400 lux to 1000 lux, more than enough in most classrooms because of the relatively large windows with clear glass. The average daylight ratios recorded in the classrooms were between 6.4 and 9.2%, which may result in glare problems. Simulations were conducted using Design-Builder to further evaluate the annual daylighting performance including Daylight Autonomy (DA), Annual Sun Exposure (ASE) and Useful Daylight Illuminance (UDI). Based on the findings, it is recommended to use shading devices or replace the glazing type to improve daylighting performance for visual comfort. Proper design and selection of windows in schools can significantly improve indoor lighting quality for students and reduce solar heat gain.

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El Mohimen, Mostafa Abd, George Hanna, and Moncef Krarti. "Analysis of Daylighting Benefits for Office Buildings in Egypt." Journal of Solar Energy Engineering 127, no. 3 (2004): 366–70. http://dx.doi.org/10.1115/1.1877472.

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This paper summarizes the results of a simulation analysis to determine the effectiveness of daylighting in reducing electrical energy consumption for office buildings in Egypt. Specifically, the impact on daylighting performance is investigated of window size, building size, daylighting control, and glazing type for three geographical locations in Egypt. It was determined that a window to wall area ratio of 0.20 minimizes the total annual electricity use for office buildings in three Egyptian locations, Cairo, Alexandria, and Aswan. A simplified analysis method is developed based on the analysis results to estimate the annual electrical energy savings attributed to daylighting.

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Madina, Rizki Fitria, Sri Tundono, Fajar Rezandi, Asyifa Putri Umara, and Muhammad Lazuardy Nurrohman. "CORRELATION OF FAÇADE CHARACTERISTICS ON ENERGY AND DAYLIGHTING PERFORMANCE OPTIMIZATION OF OFFICE BUILDING (CASE STUDY: SATRIO TOWER, JAKARTA)." Vitruvian : Jurnal Arsitektur, Bangunan dan Lingkungan 14, no. 3 (2024): 203. https://doi.org/10.22441/vitruvian.2024.v14i3.003.

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Energy-efficient building design is mandatory to obtain a building permit for new buildings in Jakarta. Greenship New Building is one of the green building assessment tools for new buildings in Indonesia compiled by the Green Building Council Indonesia. In the Energy Efficiency and Conservation category, points earned related to OTTV value and daylighting area are influenced by building facade design. This research aims to determine the correlation of building facade characteristics to energy and daylighting performance in office buildings to obtain the best performing building facade. This research uses Satrio Tower as a case study, a 26-story office building in the CBD Mega Kuningan area, South Jakarta. Data in the form of OTTV values were obtained through numerical simulations based on the OTTV formula from SNI 6389: 2020 and daylighting conditions in the building were obtained by conducting computational simulations using Dialux Evo. Then the building facade performance data is compared and analyzed for correlation. It was found that a design combining the use of a 60 cm horizontal shading device, the use of low-emissivity glass and a low window-wall ratio had the best energy and daylighting performance. Among the building facade characteristics, the visible light transmittance value of the glazing material has a positive correlation with the energy and daylighting performance.

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Sureshkumar Jayakumari, Sujan Dev, Samarasinghalage Tharushi Imalka, Rebecca Jing Yang, et al. "Energy and Daylighting Performance of Kinetic Building-Integrated Photovoltaics (BIPV) Façade." Sustainability 16, no. 22 (2024): 9739. http://dx.doi.org/10.3390/su16229739.

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The deployment of renewable energy in the construction industry has emerged as a crucial topic due to the building sector’s substantial energy consumption and greenhouse gas emissions. Building Integrated Photovoltaics (BIPV) offers a promising solution, replacing conventional building materials with solar energy-generating components. Moreover, retrofitting commercial buildings with BIPV and kinetic façades present an innovative approach to improve energy efficiency and enhance occupant well-being. Adaptive façades, capable of responding to varying climatic conditions, play a pivotal role in reducing energy consumption while ensuring thermal and visual comfort for occupants. By integrating solar generation and shading capabilities, BIPV kinetic façades deliver dual benefits, optimizing energy performance and reducing lifecycle costs, compared to traditional PV systems. Furthermore, effective daylighting strategies not only contribute to energy savings but also positively impact occupant productivity and comfort. Despite predominant research focusing on energy aspects, there is a notable gap in comprehensive assessments that integrate environmental, economic, and daylighting considerations. Therefore, evaluating Australian commercial buildings’ energy and daylighting performance with BIPV kinetic façades provides valuable insights for advancing sustainable building designs and operations in the region. The implementation of kinetic BIPV façades in Melbourne reduced energy consumption by 18% and covered 26% of energy demand, achieving the target daylighting levels.

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Ali Ahmed Salem Bahdad and Sharifah Fairuz Syed Fadzil. "Design Optimization for Light-Shelves with Regard to Daylighting Performance Improvements in The Tropics." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 100, no. 3 (2022): 35–50. http://dx.doi.org/10.37934/arfmts.100.3.3550.

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Different daylight device systems and control strategies can be employed in different parts of a window system to perform different functions, particularly for fully glazed façades. A light-shelves with parametric control in both portions of the system were proposed in this study as an innovative daylighting device to improve daylighting distribution and glare probability. The aim of this article was to present a simulation study to investigate the influence of light shelves on daylighting performance improvements in buildings located in tropical climates. Multi-objective optimization method was proposed by classifying the results based on sky conditions. The metrics of Useful Daylight Illuminance and Daylight Glare Probability were used to evaluate the daylight performance and glare to compare the final solutions of the blight shelf parameters of the light shelf. The study concludes that daylight improvements by optimal solutions of light shelves can provide the best range of optimal daylighting for visual comfort in office spaces in the tropics. The idea of a light shelf system with parametric control in both portions (inner and outer) provides the most optimal options for achieving balanced daylighting levels in both the front and back of the room. This resulted in a glare-free environment with undetectable glare indices, and acceptable daylight is accomplished, as well as a high percentage coverage within UDI300-2000 lux between 63% and 73.8% at midday and no less than 55% during working hours.

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Souza, João Pedro de Melo, Klaus Chaves Alberto, and Sabrina Andrade Barbosa. "Lightwell in residential building: Architectural solutions to the daylighting performance through parametric simulation." Acta Polytechnica CTU Proceedings 38 (December 21, 2022): 65–71. http://dx.doi.org/10.14311/app.2022.38.0065.

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The lightwell is an architectural solution to promote daylight into the internal spaces from the core of a building. The shaft configurations, such as geometry and reflectance can affect the performance of the daylighting entering the adjoining rooms under different conditions. This study aims to indicate the adequate architectural solutions to improve the daylighting performance of buildings with lightwells at three different southern latitudes. From a base model of 6-stories building, alternative cases were parametrically simulated using Rhinoceros, GrassHopper and ClimateStudio software. From variations in the lightwell geometry and walls reflectance, the cases were analyzed considering the lighting metrics UDI and sDA300. Results demonstrate that the daylighting is adequate on the floors near the top of the building and weakens towards the base of it. In Macapá, São Paulo and Chile, the sDA values reach 100 % on the top floor, but only 3 % on the first floor. It was also observed that materials with high diffuse reflectance on the shaft is more efficient in improving the daylighting performance than increasing its geometry. This research presents early-design guidance to inform architects and policymakers when considering the exploitation of daylight by the use of the lightwell.

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Lee, Jaewook, Mohamed Boubekri, and Feng Liang. "Impact of Building Design Parameters on Daylighting Metrics Using an Analysis, Prediction, and Optimization Approach Based on Statistical Learning Technique." Sustainability 11, no. 5 (2019): 1474. http://dx.doi.org/10.3390/su11051474.

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Daylighting metrics are used to predict the daylight availability within a building and assess the performance of a fenestration solution. In this process, building design parameters are inseparable from these metrics; therefore, we need to know which parameters are truly important and how they impact performance. The purpose of this study is to explore the relationship between building design attributes and existing daylighting metrics based on a new methodology we are proposing. This methodology involves statistical learning. It is an emerging methodology that helps us to analyze a large quantity of output data and the impact of a large number of design variables. In particular, we can use these statistical methodologies to analyze which features are important, which ones are not, and the type of relationships they have. Using these techniques, statistical models may be created to predict daylighting metric values for different building types and design solutions. In this article we will outline how this methodology works, and analyze the building design features that have the strongest impact on daylighting performance.

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Chen, Zeyao. "Daylighting Performance of Sunlight Transmission and Concentration via Plastic Optical Fibers." Journal of Physics: Conference Series 2386, no. 1 (2022): 012084. http://dx.doi.org/10.1088/1742-6596/2386/1/012084.

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Abstract The energy-saving technology of this thing is thriving. One of promising technology is the daylighting system via optical plastic fibers. It has many advantages, and its characteristics need further research. This paper analyses the transmission characteristics, attenuation rate, and incident angle of the optical fiber. The test data shows that the spectrum, color rendering index are good, and the energy efficiency is high. This shows that plastic optical fibres have excellent development prospects for daylighting.

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Nesma, Fercha, Benbouaziz Akila, and Alkama Djamel. "A parametric approach for daylight performance optimization of school building’s classroom." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e10707. http://dx.doi.org/10.54021/seesv5n2-539.

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Achieving a balance between visual comfort and high-quality daylighting in school buildings located in semi-arid climates requires careful consideration of design elements such as window glazing and shading devices. This study proposes an analytical approach using parametric modeling to efficiently assess daylighting and visual comfort in classrooms. To evaluate these factors, Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) metrics are applied. The findings suggest that optimal daylighting performance can be achieved using interior light shelves or exterior louvers on south-facing windows, combined with specific glazing properties. Exterior louvers of varying sizes also prove effective for regulating daylight. The parametric modeling approach enables the exploration of multiple design options, allowing architects to identify efficient strategies for balanced lighting conditions within a short period. This research provides valuable guidance for designing energy-efficient and comfortable learning environments, helping professionals make informed decisions on achieving a balance between visual comfort, daylight availability, and energy efficiency in semi-arid climates.

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Suhendri, Wahri Sunanda, and Rachmawan Budiarto. "Performance of Glazing Materials for Atrium in Hot & Humid Climate." MATEC Web of Conferences 186 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201818602007.

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One comfort issue that considered to be the most important is thermal comfort. Air temperature is the most influential factor, and it is related to solar radiation and building's glazing. Besides thermal comfort, glazing is also needed to provide daylighting. Therefore, due to its relation to thermal comfort and daylighting, the glazing materials selection is crucial. Hence, by focusing on atrium in hot and humid climate, this study is aimed to examine a sufficient material with good thermal and daylighting performance. The results show that argon filled glazing is the most suitable material for atrium glazing in hot and humid climate. Argon filled glass has lowest U-value and total solar transmission than any other glazing materials simulated, but its light transmission is not too low so the daylight delivered still adequate to the standard. Accordingly, U-value, solar heat gain coefficient, and light transmission coefficient are concluded as the determinant factor in selecting glazing material.

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Kiliç, Z. A., and A. Köknel Yener. "Determining Proper Daylighting Design Solution for Visual Comfort and Lighting Energy Efficiency: A Case Study for High-Rise Residential Building." Journal of Physics: Conference Series 2069, no. 1 (2021): 012156. http://dx.doi.org/10.1088/1742-6596/2069/1/012156.

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Abstract 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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Vaisi, Salah, Honia Modares Gorji, and Narmin Shafei. "Application of Simulation-Based Metrics to Improve the Daylight Performance of a Secondary School, An Approach for Green Building Designers and Architects." Advances in Environmental and Engineering Research 05, no. 02 (2024): 1–15. http://dx.doi.org/10.21926/aeer.2402012.

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Visual comfort affects the quality of classrooms as well as student learning. A practice-oriented approach discovers how the gap between academic research and its application in building design can be addressed. Nevertheless, the physical characteristics design of daylighting systems, including window sizes, shapes, dimensions, and materials, are considered fundamental challenges for their practicability. In this study, the physical characteristics design of daylighting systems, including window sizes, shapes, dimensions, and materials, are considered in a designed sample school, and the daylight metrics were analyzed to achieve more trustworthy and applicable daylighting systems. Grasshopper (Honeybee-Ladybug), as a parametric control method, was applied to simulate the daylighting quality for various educational spaces in a secondary school in Sanandaj City, based on average ‘Daylight Factor’, ‘Daylight Autonomy’, ‘Useful Daylight Illuminance’, and ‘Annual Sunlight Exposure’. These metrics were examined to discover the relationship between window size and positions on visual comfort. The results indicate daylighting assessments are a solid approach to revising the architectural design mistakes at the primary designing phase. Architects and other building designers or energy consumption assessors can apply the design improvement process to present more sufficient and successful architectural details. This is a fundamental step toward the implementation of green buildings.

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Czachura, A., N. Gentile, J. Kanters, and M. Wall. "Vertical Sky Component (VSC) and daylight regulation compliance by the EN 17037 and BFS 2011:6 standards." Journal of Physics: Conference Series 2600, no. 11 (2023): 112018. http://dx.doi.org/10.1088/1742-6596/2600/11/112018.

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Abstract This paper explores the relationship between the Vertical Sky Component (VSC) metric and the European and Swedish daylighting regulations. VSC, a static geometrical metric, is considered a useful early indicator of indoor daylighting, as it is insensitive to late-stage design details such as material properties and internal layout. However, its relationship with modern building daylighting legislation has not been established. To address this gap, the paper investigates the relationship of VSC and daylight compliance by static and dynamic methods through simulations of a ‘shoebox’ room with varying Window-to-Floor Ratios (WFRs) and external obstruction dimensions. The results demonstrate that VSC has a large effect on daylighting compliance and can be a useful early planning tool. The study concludes that using VSC as a daylighting indicator in the urban planning process can lead to improved early design routines for better daylight compliance in the late design stages. Future work should aim to establish VSC performance thresholds.

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Lee, E. S., and S. E. Selkowitz. "The New York Times Headquarters daylighting mockup: Monitored performance of the daylighting control system." Energy and Buildings 38, no. 7 (2006): 914–29. http://dx.doi.org/10.1016/j.enbuild.2006.03.019.

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Shao, L., A. A. Elmualim, and I. Yohannes. "Mirror lightpipes : Daylighting performance in real buildings." Lighting Research and Technology 30, no. 1 (1998): 37–44. http://dx.doi.org/10.1177/096032719803000106.

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Yi, R., L. Shao, Y. Su, and S. Riffat. "Daylighting performance of atriums in subtropical climate." International Journal of Low-Carbon Technologies 4, no. 4 (2009): 230–37. http://dx.doi.org/10.1093/ijlct/ctp027.

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Heschong, Lisa, Roger L. Wright, and Stacia Okura. "Daylighting Impacts on Human Performance in School." Journal of the Illuminating Engineering Society 31, no. 2 (2002): 101–14. http://dx.doi.org/10.1080/00994480.2002.10748396.

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Littlefair, P. J. "Light shelves: Computer assessment of daylighting performance." Lighting Research and Technology 27, no. 2 (1995): 79–91. http://dx.doi.org/10.1177/14771535950270020201.

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Edmonds, I. R., P. A. Jardine, and G. Rutledge. "Daylighting with angular-selective skylights: Predicted performance." Lighting Research and Technology 28, no. 3 (1996): 122–30. http://dx.doi.org/10.1177/14771535960280030101.

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Lee, Jaewook, Mohamed Boubekri, and Jiyoung Park. "DAYLIGHT, HUMAN HEALTH, AND DESIGN FOR SUSTAINABLE GREEN BUILDINGS: A SYSTEMATIC REVIEW." Journal of Green Building 17, no. 4 (2022): 151–78. http://dx.doi.org/10.3992/jgb.17.4.151.

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ABSTRACT As the importance of building indoor environments has increased recently due to the COVID-19 pandemic, so has the research on the interrelationship among daylight, human health, and building design. More researchers are studying how daylight affects human health and whether currently known daylighting metrics target human health in addition to building environmental performance. This article provides an updated review of the current review of the literature in the field of daylighting design and human health, particularly as it relates to the impact of daylighting on circadian rhythm, sleep quality and performance. The main objective for this study is to analyze the interrelationships between daylight, health, and design. The review of these articles reveals eight different factors relevant to daylight, in terms of the way daylight impacts people’s health, namely light spectrum, light levels, timing and duration of exposure to light. In terms of health impact, these articles outline direct and indirect health outcomes. In addition, our review of the existing literature indicates that there is a lack of proper daylighting metrics as far as design applications.

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Jia, Yingjie, Zheming Liu, Yaoxuan Fang, Huiying Zhang, Caiyi Zhao, and Xuqiang Cai. "Effect of Interior Space and Window Geometry on Daylighting Performance for Terrace Classrooms of Universities in Severe Cold Regions: A Case Study of Shenyang, China." Buildings 13, no. 3 (2023): 603. http://dx.doi.org/10.3390/buildings13030603.

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Good daylighting performance positively affects students’ physical and mental health, learning efficiency, and the building’s energy-saving capability. Due to the terrace classroom having ample space, large capacity, the ability to avoid obstructing sight, and the ability to meet various use needs, it is the most important place in university buildings. However, research on the daylighting performance of university terrace classrooms is limited, leading to a lack of quantitative guidance in early design stages. This study aims to explore the effects of interior space and window geometry of terrace classrooms in universities in severe cold regions on daylighting performance. This research took Shenyang as an example; spatial daylight autonomy (sDA300,50%) and useful daylight illuminance (UDI100–2000) were selected as daylighting performance evaluation indices. Based on the Grasshopper parametric platform, the simulation was carried out using Ladybug and Honeybee plugins. Correlation and regression analyses revealed the relationship between interior space and window geometry parameters and the evaluation indices. The results showed the following: window-to-floor ratio (WFR), classroom height (Htc), window height (Hw), window-to-wall ratio (WWR), classroom width (Wtc), and window width (Ww) have positive effects on improving the daylight sufficiency of the terrace classrooms facing each orientation, and the degree of the effect decreases in order. To ensure the overall daylighting performance, the Wtc can be maximized. The width of walls between windows for south-facing and west-facing classrooms should be 0.9 m. The WWR and WFR for south-facing classrooms should be 0.3–0.5 and 0.11–0.14, respectively. The WWR and WFR for north-facing classrooms should be 0.6–0.7 and 0.14–0.20, respectively. Prediction models are established for the sDA300,50% and UDI100–2000 of the terrace classrooms facing each orientation.

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Zhang, Jianjian, and Lin Ji. "Optimization of Daylighting, Ventilation, and Cooling Load Performance of Apartment in Tropical Ocean Area Based on Parametric Design." Advances in Civil Engineering 2021 (August 28, 2021): 1–11. http://dx.doi.org/10.1155/2021/6511290.

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In tropical areas of China, energy saving is an important part of architectural design, and the energy-saving potential of residential buildings has attracted extensive attention. This paper studies the daylighting, ventilation, and building energy consumption in tropical areas to find out the best energy-saving performance parameters. The building model is established by grasshopper, and the parameters of daylighting, ventilation performance and cooling load are simulated. The octopus plug-in in grasshopper is used to calculate the target value iteratively, so as to find the relative optimal value of multiobjective. Finally, the optimized design value is compared with the initial value. The results show that the refrigeration energy consumption is greatly reduced from 188.20 kwh/m2 to 163.02 kwh/m2, the Daylight Autonomy (DLA) is reduced from 60.71% to 58.56%, and the ventilation wind speed is increased from 0.62 to 0.63 m/s. It can be seen from the results that although the daylighting objectives was reduced, the cooling energy consumption is greatly reduced, and the optimized daylighting layout is more balanced and reasonable. Therefore, on the basis of reasonable layout, this optimization study effectively reduces the refrigeration energy consumption and achieves the goal of green energy saving.

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AL-Dossary, Ali Mohammed, and Daeung Danny Kim. "A Study of Design Variables in Daylight and Energy Performance in Residential Buildings under Hot Climates." Energies 13, no. 21 (2020): 5836. http://dx.doi.org/10.3390/en13215836.

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In Saudi Arabia, residential buildings are one of the major contributors to total energy consumption. Even though there are abundant natural resources, it is somewhat difficult to apply them to building designs, as design variables, due to slow progress and private issues in Saudi Arabia. Thus, the present study demonstrated the development of sustainable residential building design by examining the daylighting and energy performance with design variables. Focusing on the daylighting system, the design variables were chosen, including window-to-wall ratios (WWR), external shading devices, and types of glazing. The illuminance level by these design variables in a building was evaluated by using daylight metrics, such as spatial daylight autonomy and annual sunlight exposure. Moreover, the building energy consumption with these design variables was analyzed by using energy simulation. As a result, the daylighting was improved with the increase in WWRs and the tinted double glazing, while these design options can cause overheating in a residential building. Among types of glazing, the double pane windows with a low-E coating showed better energy performance. Based on the results, it is necessary to find the proper design variables that can balance the daylighting and energy performance in residential buildings in hot climates.

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Ukpong, Edidiong, Francis Uzuegbunam, and Emmanuel Udomiaye. "Performance of combined daylighting strategies in varied sky conditions: post occupancy evaluation of lecture rooms in a tropical climate." Mehran University Research Journal of Engineering and Technology 41, no. 2 (2022): 44–63. http://dx.doi.org/10.22581/muet1982.2202.05.

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Due to the inadequate attention given to daylighting in lecture rooms in tropical wet and dry climate, this study, using field measurement, evaluates combined daylighting strategies in three lecture rooms labelled LLH, BMS and ANB with distinct bilateral glass louvre windows, window floor ratio, orientation and shading strategies. It determines the difference in illuminance in varied sky conditions, and the relationship between the strategies. Results revealed that under the clear sky condition, combined strategies in LLH and BMS rooms were effective in illuminance performance except during evening hours while the one in ANB was ineffective. Both rooms recorded poor daylight uniformity. Similar performance was obtained under overcast sky but they produced effective daylight uniformity. An effective daylighting was obtained throughout the process in the intermediate sky condition, however, the strategy in ANB room was ineffective in the evening hours. Only ANB room had an effective daylight uniformity in the intermediate sky. The strategy in LLH room had a strong positive relationship with BMS’s. The strategy in LLH had a weak positive correlation with ANB’s, but ANB’s strategy had strong positive correlation with BMS’s. Overall, the study contributes to the performance of combined daylighting strategies in tropical wet and dry climate.

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Boubekri, Mohamed, and Jaewook Lee. "A COMPARISON OF FOUR DAYLIGHTING METRICS IN ASSESSING THE DAYLIGHTING PERFORMANCE OF THREE SHADING SYSTEMS." Journal of Green Building 12, no. 3 (2017): 39–53. http://dx.doi.org/10.3992/1943-4618.12.3.39.

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The assessment of the daylighting performance of a design solution is a complex task due to the changing nature of daylight. A few quantitative metrics are available to designers to assess such a performance, among them are the mean hourly illuminance (MHI), the daylight factor (DF), the daylight autonomy (DA) and the useful daylight illuminance (UDI). Each of these metrics has a purpose, a set of criteria and limitations that affect the outcome of the evaluation. When to use one metric instead of another depends largely on the design goals to be achieved. Using Design Iterate Validate Adapt (DIVA) daylighting simulation program, we set out to examine the performance behavior of these four metrics with the changing dimensions of three shading devices: a horizontal overhang, a horizontal louver system, and a vertical fin system, and compare their performance behavior as the orientation changes of the window to which these devices are attached. The context is a typical classroom of a prototypical elementary school. Our results indicate that not all four metrics behave similarly as we vary the size of each shading device and as orientation changes. The lesson learned is that not all daylighting metrics lead to the same conclusions and that it is important to use the metric that corresponds to the specific goals and objectives of the design and of the daylighting solution. The UDI is the metric that leads to outcomes most different than the other three metrics investigated in this paper.

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Bahdad, Ali Ahmed, Nooriati Taib, Fahad Saud Allahaim, and Ali Mohammed Ajlan. "Parametric Optimization Approach to Evaluate Dynamic Shading Within Double-Skin Insulated Glazed Units for Multi-Criteria Daylighting Performance in Tropics." Journal of Daylighting 11, no. 2 (2024): 349–71. http://dx.doi.org/10.15627/jd.2024.24.

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This research aims to support the choice of an appropriate dynamic louver shading system (DL-SS) within double-skin facade insulated glazed units (DSF-IGUs) as a high-performance integrated window system (DSF-IGUs/DL-SS) that meets both thermal and energy performance via daylight availability under a tropical climate. The research framework has developed a multi-objective optimization method to achieve research objectives via optimizing two different scenarios of the proposed system. The first scenario was optimized for daylighting availability, meanwhile, the second scenario was optimized for energy and thermal performance. For each scenario, the best solutions are selected from respective Pareto fronts according to energy efficiency criteria, thermal comfort via enhancing daylighting availability. Based on the best options resulting from both optimizations, the final step involved comparing the results of all performance indicators in the best cases to select the best solution. Overall, based on the optimizing objectives, the ranking of the best cases varied based on giving priority to the improvement objective in the optimization process. For each scenario, the best solutions are selected from the respective Pareto fronts. Overall, ranking of the best cases varied based on giving priority to the improvement objectives. Optimizing DL-SS within DSF-IGUs while giving priority to improving energy and thermal comfort while maintaining daylighting at acceptable levels is more reasonable. Thus, the DSF-IGUs/DL-SS best-case resulting from the second optimization scenario was overcome all best cases and ranked first in energy and thermal comfort. Compared to the base case, the differences of total Predicted mean vote and percentage of dissatisfied for better thermal comfort achieved were -0.35% and -1.48% with an average decreased by 22.99% and 28.72%, respectively. The differences of total energy and cooling load for better energy performance reduced by -96.84 kwh/m2. and -86.88 kwh with an average decreased by 25.33% and 26.20%, respectively. Meanwhile, the total satisfied of spatial Daylight Autonomy for better daylighting distribution and better daylighting availability of useful daylighting illuminance improvement were improved by -5.54% and +24.76% with an average percentage variation increased by 6.25% and 36.87%, respectively.

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