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The study aims to assess the extent to which daylighting strategies are implemented in selected convention centres. The objectives are to identify daylighting strategies utilized in selected convention centres, and evaluate their adequacy. The study focused on convention centres as they are commercial buildings that consume large amounts of energy. Three convention centres were conveniently selected at random in Lagos State, Nigeria due to the easy access for observation. The study used the mixed-method approach. 100 questionnaires were issued to respondents in each centre and 131 were retrieved and used for analysis. The data collected were descriptively analyzed using the Statistical Package for Social Sciences (SPSS), and the results were sorted from the highest to the lowest in terms of their mean item score (MIS), and presented in tables. The sizes and functions of the identified strategies in the case studies were analyzed in relation to standards, and the findings were discussed in relation to other researches. It was revealed that the selected convention centres did not utilize daylighting strategies effectively as they rely largely on artificial lighting. The findings further revealed that daylighting is not very well considered at the conceptualization stage of this building typology. The pieces of evidence show that as the elements in a space are considered, adequate daylight can enter that space and create the potential for energy savings in lighting. Further studies can be carried out in existing convention centres in other developing countries to explore the influence of daylighting on energy savings. This paper provides valuable information on acceptable daylighting strategies based on the observations made which could be incorporated in convention centres from the design stage, and insight into measuring the adequacy of daylighting strategies in convention centres in comparison with other researchers’ findings as discussed below.

Kindergarten activity rooms benefit children’s growth and development under good natural indoor lighting conditions. Therefore, it is of great significance to conduct research on the indoor daylighting effects of kindergarten activity rooms under different orientations. However, most of the existing studies are based on the analysis and simulation of fixed orientations and single elements, and lack of comprehensive evaluation and analysis. Based on the above problems, this study utilizes China’s light climate data and daylighting standards for kindergartens, and selects Linzhi, Kunming, Zhengzhou, Hangzhou, and Guiyang as the research locations, and comprehensively evaluates the indoor daylighting effects. The results of the study show that: (1) The daylighting effect of kindergarten activity rooms in China’s different light climate zones varies greatly, mainly affected by the daylighting orientation, and the high-quality daylighting orientations of the five cities mainly focuses on the range of 210°–255°; (2) The value of sDA of the five cities is basically more than 75%, the uniformity of daylighting effects has all achieved good or higher standards; (3) Guiyang is the least affected by glare, with the smallest impact time range, while the other four cities are more serious. This study explores the impact of sDA, illuminance, and DGP in kindergarten activity rooms on children. The results provide a valuable baseline and technical reference for the daylighting design of kindergarten activity rooms.

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.

The performance of machine learning (ML) algorithms depends on the nature of the problem at hand. ML-based modeling, therefore, should employ suitable algorithms where optimum results are desired. The purpose of the current study was to explore the potential applications of ML algorithms in modeling daylight in indoor spaces and ultimately identify the optimum algorithm. We thus developed and compared the performance of four common ML algorithms: generalized linear models, deep neural networks, random forest, and gradient boosting models in predicting the distribution of indoor daylight illuminances. We found that deep neural networks, which showed a determination of coefficient (R2) of 0.99, outperformed the other algorithms. Additionally, we explored the use of long short-term memory to forecast the distribution of daylight at a particular future time. Our results show that long short-term memory is accurate and reliable (R2 = 0.92). Our findings provide a basis for discussions on ML algorithms’ use in modeling daylight in indoor spaces, which may ultimately result in efficient tools for estimating daylight performance in the primary stages of building design and daylight control schemes for energy efficiency.

Light shelves have been discussed in numerous studies as suitable solutions for controlling daylight in side-lit spaces. It is a system that can be easily modified, offering a range of design solutions. It can be easily mounted on the exterior and/or the interior of a vertical opening, it can come in various shapes from static flat forms to curved reflective surfaces, or it can even be actively controlled. A light shelf can offer shading and at the same time can redirect a significant part of the incoming light flux towards the ceiling improving daylight uniformity. Due to the aforesaid functions, light shelves are among the most popular system design solutions when it comes to daylight exploitation. The purpose of this paper is twofold. Firstly, to present the main research findings in relation to light shelves as daylighting systems and secondly to analyze the results, trying to establish a common basis for some efficient and practical design rules. The present paper is a review of the research realized in the last three decades concerning these systems together with their associated implications in a building’s daylight performance as well as in its energy balance in a few cases. In addition, the critical review of their design principles is included, which makes the presented information useful for design teams trying to select the optimal available system for any specific project.

To maintain comfortable indoor conditions, buildings consume ~40% of the energy generated globally. In terms of passively isolating building interiors from cold or hot outdoors, windows and skylights are the least-efficient parts of the building envelope because achieving simultaneously high transparency and thermal insulation of glazing remains a challenge. Here we describe highly transparent aerogels fabricated from cellulose, an Earth-abundant biopolymer, by utilizing approaches such as colloidal self assembly and procedures compatible with roll-to-roll processing. The aerogels have visible-range light transmission of 97–99% (better than glass), haze of ~1% and thermal conductivity lower than that of still air. These lightweight materials can be used as panes inside multi-pane insulating glass units and to retrofit existing windows. We demonstrate how aerogels boost energy efficiency and may enable advanced technical solutions for insulating glass units, skylights, daylighting and facade glazing, potentially increasing the role of glazing in building envelopes. Windows are one of the least energy efficient parts of the building envelope because of poor thermal insulation. Abraham et al. develop a cellulose-based aerogel as a thermal barrier for windows that retains their optical properties.

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.

Library building design features contribute to the performance of indoor daylight. Reading spaces in library buildings require effective daylighting for high productivity. This study evaluated the indoor daylight quality of three reading spaces, namely Esut-Hall A, Esut-Hall C, and Esut-Hall F, located in the main library of Enugu State University of Science and Technology (ESUT). The research aimed to assess the influence of individual building design features on the daylight performance of these spaces. The study adopted case study research, in combination with building simulation with Velux daylight visualizer software. The first result identified sixteen building design features that influenced the daylight quality. The second result indicated that the daylight quality values of Esut Hall A and Esut Hall F passed the 50% threshold for mean UDI 300lux-2000 lux DA, UDI 300lux-500 lux DA, and DF, showing that they have good daylight quality. For the remaining reading space, it was recommended that the area of the effective windows should be increased, and top light windows should be introduced.

The main objective for this paper is focused on an evaluation of sun-shading daylighting in a four-star hotel design mass. The daylighting has potential and considers as the best strategy for energy saving. Lowering energy costs can directly increase revenue, coupled with the potential for gradual increase in PLN electricity. Apart from financial and service benefits, saving energy is also a form of concern for the sustainability of the environment which has an impact on social life. The method that used in this paper is quantitative simulation, which is presented in the paper by specification of daylighting in a four-star hotel design on solstice day, 21 st December. The simulation is done by Velux Daylighting Visualizer, with a couple of lost variables. The simulation for this condition represents two extreme cases for maximum and minimum daylight levels in annual evaluation.

Operational energy use and energy-based GHG emissions of air-conditioning in the building sector are increasing aggressively due to occupants’ higher thermal and visual comfort aspirations. Window glazing is the critical building component that affects the thermal performance of the conditioned space. The existing glazing in the buildings allows huge heat gain/loss, leading to additional energy requirements for HVAC systems. Novel laminated glasses with various solar control film interlayers were studied in this article to improve the thermal performance of the conditioned space. Solar-optical properties and thermal indices of proposed laminated glasses were explored to study the potential energy savings and carbon emission mitigations. Thermal loads and energy savings were calculated with the help of a validated mathematical model across three distinct Indian climates (hot, cold, and composite). Substantial reductions in heat gain/loss and energy requirements were found with laminated glasses compared to monolithic clear glass. The laminated glass with reflective solar control film glazing ( LG RF ) had concluded a cost saving of 100.84 $/year with a payback period of 1.7 years for cold climate in S-E orientation. CO 2 emission mitigation of building with laminated glasses was calculated for the energies conserved with carbon emission factors. The LG RF had reported a carbon emission mitigation of 2.1 tCO 2 /year for cold climates and comparable results for hot and composite climates. Daylight performance was carried out with the DesignBuilder simulation tool to assess the daylight accession in building interiors with laminated glasses. The laminated glasses were able to reduce annual energy requirements without greatly affecting the daylight inflow.