Analysis of Daylighting Quality in Institutional Libraries

DergiPark (Istanbul University), 2023

Natural light is the healthiest light physically and spiritually and should be used with maximum efficiency in the space. The library structures, which serve users with different characteristics, continue to function as culture and information centers and have been an indispensable part of information societies from the past to the present with their contributions to social and economic development. In this study, the illuminance levels of natural light were analyzed in the library space of Ostim Technical University, which is a university library, and space-light discussions were made on the visual outputs. The method of the study consists of several stages. First, the library space was modeled in the computer environment and natural light distribution analyzes were made in the Velux Daylight Visualizer program in line with the determined parameters. The outputs were examined according to the standards researched within the scope of the study. The aim of this study is to examine the brightness levels provided by natural light in the library spaces through the library selected as an example and to reveal its undeniable role in shaping the space together with the spatial setup.

Proceedings of the EduARCHsia & Senvar 2019 International Conference (EduARCHsia 2019), 2020

Daylight entering through the window can be obtained from several sources, namely direct sunlight, clear sky, clouds or reflections of the lower surface and surrounding buildings. Light from each source differs not only in the amount and heat it carries, but also in other qualities, such as color, distribution, and savings. To get natural lighting in the space required large windows or glass walls at least 1/6 of the floor area. Light is the most important part of human life, to get the right lighting in a space, it is necessary to design the right natural lighting according to their needs so that visual comfort can be achieved. Visual comfort is the recommended lighting level that does not exceed the stated threshold and brightness level, and no glare space occurs. Not only to illuminate a room, but the level of lighting also affects the condition of the room created. But visual comfort will be disrupted if glare problems occur. Visual disturbances in the form of "glare" affect visual performance which adversely affects the ability to see. Based on previous research, it was found that the average value of the natural lighting intensity in the reading room of the 3rd floor of the library of Budi Luhur University was 663 lux, this shows that the average value of the natural lighting intensity that occurred exceeded SNI standards and caused glare problems that could interfere with comfort library users, so there needs to be a natural lighting system strategy that can be applied to achieve visual comfort in the library reading room on the 3rd floor. This research was conducted with the main objective is to get a shading device design solution that can reduce glare problems to achieve visual comfort. The research method used in this study is a quantitative research method with an experimental approach. The variables in this study are experimental variables (visual comfort, opening orientation, shading device design) and nonexperimental variables (direct light source, sky conditions, and direct glare). The stages of this research are in the form of; i) identification and data collection in the form of library studies related to natural lighting, visual comfort and shading devices, ii) identification and data collection in the form of library studies related to shading devices, iii) observation of case studies in the form of taking pictures in the form of photographs and work drawings, iv) conducting simulation of several alternative shading devices designs that will be applied to the window openings of the 3rd floor library reading room of Budi Luhur University, v) analysis and synthesis, vi) making research results and drawing conclusions. The results of this study in the form of the most optimal design of shading devices that can reduce lighting intensity is an alternative horizontal overhang 4 design with an overhang width of 200 cm. Whereas the most optimal design of vertical overhang shading devices that can reduce lighting intensity is alternative vertical overhang design 1 with overhang width of 50 cm and vertical fin distance every 50 cm.

2019

Light, or its absence, represents a substantial issue in architecture. Its presence is essential to define the space; natural light in particular, "soft" and continuous, has this task. Natural light design aims to minimize the energy consumption of buildings and maximize well-being in confined spaces. It is an element of improvement of comfort conditions. The variability of natural light during the day is a positive stimulus both from the biological and psychological point of view for the human being and work environments lit by natural light are considered much less stressful for the eyes. In addition to that, when a workplace is exposed to natural light it makes it more productive, more efficient, healthier and more creative. Furthermore, a proper design of the building should guarantee, at least during the hot seasons, the correct implementation of natural light, in such a way to reduce the energy intake of artificial lighting. The present study is designed to analyze n...

Abstract: The study is plunge on the adequacy of lighting for Library activities in Ibrahim Badamasi Babangida library, Modibbo Adama University of Technology Yola (IBB library). The library is a one storey building. Total enumeration of the spaces was executed. A digital light meter was used to evaluate the light level in the spaces as well as a digital camera for photographs. The major factor considered in the research is the level of illumination on the work plane in the interior of the building. The data collected was analyzed using tables and figures. Findings show that library area with natural lighting below 500 lux for office and reading halls as well as 20 lux for ancillary spaces amounts to 2262.32square meters (96.49% of the total library area). Dark zones in the building are apparent during power outages. Some recommendations from the research includes retrofitting of the building to allow for natural lighting as well as installation of USG majestic acoustical reflective ceiling panels to replace the former as well as replacement of light color glazed granite tiles with the terrazzo floor, and installation of roller shade blinds which can be easily controlled for optimum light penetration.

Buildings - MDPI, 2016

Daylight can be considered as one of the most important principles of sustainable architecture. It is unfortunate that this is neglected by designers in Tehran, a city that benefits from a significant amount of daylight and many clear sunny days during the year. Using a daylight controller system increases space natural light quality and decreases building lighting consumption by 60%. It also affects building thermal behavior, because most of them operate as shading. The light shelf is one of the passive systems for controlling daylight, mostly used with shading and installed in the upper half of the windows above eye level. The influence of light shelf parameters, such as its dimensions, shelf rotation angle and orientation on daylight efficiency and visual comfort in educational spaces is investigated in this article. Daylight simulation software and annual analysis based on climate information during space occupation hours were used. The results show that light shelf dimensions, as well as different orientations, especially in southern part, are influential in the distribution of natural light and visual comfort. At the southern orientation, increased light shelf dimensions result in an increase of the area of the work plane with suitable daylight levels by 2%–40% and a significant decrease in disturbing and intolerable glare hours.

Harvesting daylighting can significantly cut energy use in office buildings. However it requires careful design to counterbalance heat gain or loss, glare and variations in daylight availability. Designers with proper planning can not only improve the visual environment and create a higher-quality space but also lower energy costs for buildings. Lighting control with photosensors can take full advantage of daylighting by dimming light output so that no more light is produced than necessary. As a result, occupants tend to be more productive, comfortable and efficient. This paper focus on the occupant satisfaction and acceptance in relation to the daylighting in offices with automated daylight control. Three office buildings with automated lighting control were examined. These buildings were chosen because of their installed daylight responsive system. A questionnaire was given to the occupants and a study of their preferences in regard daylight was conducted.

STAR Sanat ve Tasarım Araştırmaları Dergisi , 2023

Natural light is the healthiest light physically and spiritually and should be used with maximum efficiency in the space. The library structures, which serve users with different characteristics, continue to function as culture and information centers and have been an indispensable part of information societies from the past to the present with their contributions to social and economic development. In this study, the illuminance levels of natural light were analyzed in the library space of Ostim Technical University, which is a university library, and space-light discussions were made on the visual outputs. The method of the study consists of several stages. First, the library space was modeled in the computer environment and natural light distribution analyzes were made in the Velux Daylight Visualizer program in line with the determined parameters. The outputs were examined according to the standards researched within the scope of the study. The aim of this study is to examine the brightness levels provided by natural light in the library spaces through the library selected as an example and to reveal its undeniable role in shaping the space together with the spatial setup.

Proceedings of the 10thInternational Conference of Faculty of Architecture Research Unit (FARU), University of Moratuwa, Sri Lanka, 2017

Daylight creates an ambience of quiet tranquillity and visual comfort to link the modern library user, psychologically, with the space they occupy. In order to provide comfortable and glare-free light in reading spaces, volumes and surfaces illuminated with natural light have played a significant role. There should be optimum natural light which provides comfort for the user, albeit without the negative aspects of glare and heat. We Focus on 'Good Reading Light': Visual Comfort Perception and Daylight Integration in Library Spaces. Research problems evaluate the 'Perceived Reading Light Level', why and in what way daylight should be integrated into the indoor environment in a library space, to realize light-related goals of visual comfort. The research method consists of two parts; the Reading Light Test and the Perceptual Spatial Analysis (PERCIFAL). A group of twenty architecture students were surveyed for both components. The results show that Visual Comfort Perception depends on strategies adopted for daylight integration and that most reading spaces were perceived to be over lit. Conclusions drawn highlight that top lighting strategies and a combination of clerestory and side lighting are more effective than only side lighting via windows-as daylight control in public library spaces are difficult.

Fayoum University Journal of Engineering, 2020

University libraries are one of the most important places that offer knowledge, services and a suitable study environment. A well-designed library space can have a great impact on students' performance and social behavior. Daylighting is a controlled tool that affects the perception, visual, psychological comfort, and behavior of library users. However, many of the current university libraries in Egypt lack the presence of efficient daylighting strategies and without consideration of how daylight affects students' comfort. The group study area, social gathering space, and private reading space are three different areas in the academic library with different usage and different daylight distribution. This research aims to identify a set of design strategies for using daylight to enhance users' psychological condition, interaction with the surrounding, and visual comfort in private reading space, group study space, or a social space, in the university libraries. The research method will be based on four phases starting with analyzing the different strategies of daylight in a space. Followed by discussing the aspects of daylight that influence human visual and psychological condition. Then, analyzing each space in the academic library by understanding its different usage, daylight distribution, and effect on student perception and comfort. Finally, deducting a design method that will be used a checklist (matrix) to identify different sittings of daylight strategies in different library spaces. The expected result will be deducted from the design matrix to identify a set of efficient daylight strategies for selected spaces in academic libraries to enhance user's visual comfort, psychological condition, and interaction with the surrounding.

Buildings

One of the main challenges in visual comfort assessment is controlling daylight in indoor spaces. The effect of daylight’s contribution to total light is one of the variables influencing how people perceive illumination in an indoor environment. This study investigates the optimal day-light-to-total light ratio that delivers the most satisfaction with the lighting environment. Therefore, a subjective survey of 509 questionnaires and field measurements in six office buildings in Tehran with a total of 257 rooms was conducted to assess lighting quality (daylight and artificial light). Furthermore, the effects of building characteristics and seasons on the acceptable range of daylight ratio are investigated. The results reveal that occupants prefer daylight to total light ratio ranging between 0.56 and 0.8. In contrast, occupants reported that a ratio less than 0.4 was unacceptable. It was also found that the optimum daylight-to-total light ratio is influenced by the season and the bui...