Journal of Daylighting最新文献_第8页

The Impact of Courtyard and Street Canyon Surroundings on Global Illuminance and Estimated UV Index in the Tropics 庭院和街道峡谷环境对热带地区全球照度和估算紫外线指数的影响

Q2 Energy

Journal of Daylighting

Pub Date : 2020-08-24 DOI: 10.15627/jd.2020.16

R. A. Mangkuto, M. Koerniawan, B. Paramita

Exposing oneself to outdoor daylight in the morning can be healthy and harmful at the same time, due to the risk of ultraviolet exposure. The presence of surrounding buildings in the urban context may also influence the risk. This study aims to identify the impact of courtyard and street canyon surroundings of various size and heights on the peak time and values of global illuminances and ultraviolet index (UVI), for the case of a tropical city. The impact of the surroundings is estimated by performing annual daylighting simulation with Daysim, considering various receiving plane orientations, followed with sensitivity analysis. The results suggest that in the courtyard scenes, on 21 March, 21 June, and 22 December, the maximum horizontal UVI are respectively 9 at 12.00 hrs, 9 at 10.00 hrs, and 5 at 11.00 hrs, while the corresponding, maximum vertical UVI are 6, facing east at 09.00 hrs; 8, northeast at 10.00 hrs; and 3, southeast at 08.00 hrs. In the street canyon scenes, the 5m wide street is more sensitive to height variation, compared to the 10-m wide. The maximum horizontal UVI on the three days are 10, 9, and 5; while the corresponding, maximum vertical UVI are 6, east; 9, northeast; and 4, southeast; all with the same peak time as in the courtyard scenes. Sensitivity analysis results from the three days are found to be more reliable than those from the entire year. The study thus has the main contribution in providing the methodology in estimating UVI under various outdoor scenarios with surrounding buildings, particularly in the tropical region. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

由于暴露在紫外线下的风险，早晨暴露在室外日光下可能是健康的，同时也是有害的。城市环境中周围建筑物的存在也可能影响这种风险。本研究旨在以热带城市为例，确定不同大小和高度的庭院和街道峡谷环境对全球照度和紫外线指数(UVI)峰值时间和值的影响。环境的影响是通过使用Daysim进行年度采光模拟来估计的，考虑到不同的接收平面方向，然后进行灵敏度分析。结果表明:3月21日、6月21日和12月22日庭院景观中，水平紫外线指数最大值分别为9(12.00时)、9(10.00时)和5(11.00时)，垂直紫外线指数最大值为6(9.00时);8、东北方向10时;8点，东南方向3号。在街道峡谷场景中，5m宽的街道比10m宽的街道对高度变化更为敏感。3天的最大水平紫外线指数分别为10、9、5;而对应的最大垂直紫外线指数为6，东;9日,东北;4、东南方向;所有的高峰时间都和院子里的场景一样。三天的敏感性分析结果比全年的敏感性分析结果更可靠。因此，这项研究的主要贡献在于提供估算各种室外环境下紫外线指数的方法，特别是在热带地区。©2020作者。由solarlits.com出版。这是一篇基于CC BY许可(https://creativecommons.org/licenses/by/4.0/)的开放获取文章。

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引用次数: 4

Effective Use of Daylight in Office Rooms 有效利用办公室内的日光

Q2 Energy

Journal of Daylighting

Pub Date : 2020-08-12 DOI: 10.15627/jd.2020.15

V. Burmaka, M. Tarasenko, Kateryna Kozak, L. Omeiza, Nataliia Sabat

The rational use of daylight can significantly reduce the cost of electricity for artificial lighting. This research aims at investigating the parameters of translucent structures of building envelope, and the value of daylight factor, for which maximum efficiency of daylight usage is achieved in office rooms. The study analyzes the dependence duration of daylight autonomy in office rooms, on the value of daylight factor for four European cities. The specific daylight autonomy (h/(year∙m2)) of office rooms were found. It was proved, that regardless the size of the rooms, the maximum specific daylight autonomy in Ternopil city (at illumination of 300 lx, which is prescribed by regulations), with lateral daylight, occurs when the daylight factor is in the range of 1.7% to 1.9%. Maxima – at 1.8%. At illumination of 500 lx, the maximum specific daylight autonomy will occur at a daylight factor range of 2.6% to 3.0%. Maxima – at 2.8%.

合理利用日光可以显著降低人工照明的电力成本。本研究旨在研究建筑围护结构的半透明结构参数，以及日光因子的价值，从而在办公室内实现日光的最大利用效率。该研究分析了四个欧洲城市的办公室内日光自主性对日光因子值的依赖时间。确定了办公房间的具体日光自主性(h/(年∙m2))。事实证明，无论房间大小，Ternopil城市最大的特定日光自主性(照度为300 lx，法规规定)发生在日光因子在1.7%至1.9%范围内时。Maxima——1.8%。在500lx的照度下，最大的特定日光自主性将发生在日光因子范围为2.6%至3.0%。Maxima——2.8%。

引用次数: 9

A New Trend for Indoor Lighting Design Based on A Hybrid Methodology 基于混合方法的室内照明设计新趋势

Q2 Energy

Journal of Daylighting

Pub Date : 2020-07-02 DOI: 10.15627/jd.2020.14

F. Selim, Samah M. Elkholy, A. Bendary

Most power system planners are interested in the savings of electrical power consumption. Various references demonstrate that the highest consumed power is by the lighting systems standing around 19% of worldwide energy consumption. This article presents novel design methodology leading to maximizing revenue due to savings in electrical energy consumption through energy efficient installations. This hybrid methodology is built by combining benefits of the two traditional lighting design methods (lumen and specific connected load methods). This results in developing a new mathematical and applicable model with many advantages such as: high accuracy, fast calculations and most economical design. This proposed methodology is supported by MATLAB® package to shorten the long time consumed by conventional procedures and simplify the complex manual calculations. The hybrid method verifies its effectiveness and efficiency for achieving the maximum savings in energies and costs through the detailed discussion of case studies. A comparison with traditional designs will be introduced to ensure the achieved savings in costs leading to high quality and efficiency of power systems. By practically applying this new hybrid technique particularly for the Egyptian residential and commercial sectors, the system is expected to achieve a huge savings in consumed lighting energies and costs, which can reach 4489.433415 million E£ "≈ 280.5895 million $ "USD"" each year. The presented case studies give accurate and promising results for the proposed methodology as a new trend in energy and money saving system, which is verified by implementing two case studies and comparing with results from DIALux program. The results of the proposed methodology are very effective compared with that of conventional methods for marked benchmarking features and validation. MATLAB® simulation results of the proposed technique are implemented to verify its feasibility for any activity. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

大多数电力系统规划者对节省电力消耗感兴趣。各种参考文献表明，消耗功率最高的是占全球能源消耗19%左右的照明系统。本文提出了一种新颖的设计方法，通过节能装置节省电能消耗，从而实现收入最大化。这种混合方法是通过结合两种传统照明设计方法（流明和特定连接负载方法）的优点而构建的。这导致开发了一种新的数学和应用模型，该模型具有许多优点，如：高精度、快速计算和最经济的设计。该方法由MATLAB®软件包支持，以缩短传统程序消耗的长时间，简化复杂的手动计算。通过对案例研究的详细讨论，验证了混合方法在实现能源和成本最大化方面的有效性和效率。将引入与传统设计的比较，以确保实现成本节约，从而实现电力系统的高质量和高效率。通过实际应用这种新的混合技术，特别是在埃及住宅和商业部门，该系统预计将在消耗的照明能源和成本方面实现巨大节约，每年可达到44894334.15万E£≈28058.95万美元。所提出的案例研究为所提出的方法提供了准确和有前景的结果，这是节能和省钱系统的一个新趋势，通过实施两个案例研究并与DIALux项目的结果进行比较验证了这一点。与标记基准特征和验证的传统方法相比，所提出的方法的结果非常有效。实现了所提出技术的MATLAB®仿真结果，以验证其在任何活动中的可行性。©2020作者。由solarlists.com发布。这是一篇基于CC by许可证的开放访问文章(https://creativecommons.org/licenses/by/4.0/)。

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引用次数: 5

Optimization of Daylight Performance Based on Controllable Light-shelf Parameters using Genetic Algorithms in the Tropical Climate of Malaysia 基于可控制光架参数的遗传算法在马来西亚热带气候夏令时优化中的应用

Q2 Energy

Journal of Daylighting

Pub Date : 2020-06-20 DOI: 10.15627/jd.2020.10

A. A. S. Bahdad, S. Fadzil, N. Taib

This study aims to achieve a balance of daylight availability in the work-plane environments of a fully glazed facade integrated with a light shelf system using an optimization procedure that can assist architects with assessing the daylighting performance of numerous design alternatives, and build-up the optimized design. The approach uses parametric design, simulation modelling, and genetic algorithms. A case study of a typical office is carried out to test and verify the effectiveness of the optimization procedure for a light shelf system. Five parameters of light shelf design are optimized in two solar solstices (June and December) and one equinox in March under the Malaysian sky conditions. The optimization results indicate that the optimal design options of light-shelf parameters have great potential for illuminance improvement. After the optimization, the daylighting performance of useful daylight illuminance compared to reference models is increased respectively with an average value of 15.6% and 4.7% on the 21st of June, and by 17.5% and 5.8% on 21st of March, and by 5.8% and 11.3% on 21st of December. Statistical analysis is achieved to investigate the relationship between the performance metric of the optimal design options and the other cases, the outcomes showed that the regression analysis indicated a high level of reliability as well as different levels of variation coefficients. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

本研究旨在通过优化程序，在与光架系统集成的全玻璃立面的工作平面环境中实现日光可用性的平衡，该优化程序可以帮助建筑师评估多种设计方案的采光性能，并构建优化设计。该方法使用参数化设计、模拟建模和遗传算法。以一个典型的办公室为例，测试和验证了轻型货架系统优化程序的有效性。在马来西亚的天空条件下，在两个太阳至点（6月和12月）和3月的一个春分对光架设计的五个参数进行了优化。优化结果表明，光架参数的优化设计方案具有很大的提高照度的潜力。优化后，与参考模型相比，有用日光照度的采光性能在6月21日分别提高了15.6%和4.7%，在3月21日提高了17.5%和5.8%，在12月21日增加了5.8%和11.3%。通过统计分析研究了最优设计方案的性能指标与其他情况之间的关系，结果表明，回归分析表明，该方案具有较高的可靠性以及不同水平的变异系数。©2020作者。由solarlists.com发布。这是一篇基于CC by许可证的开放访问文章(https://creativecommons.org/licenses/by/4.0/)。

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引用次数: 29

Optimisation of Passive Solar Design Strategies in Side-lit Offices: Maximising Daylight Penetration While Reducing the Risk of Glare in Different Chilean Climate Contexts 侧光办公室被动式太阳能设计策略的优化：在不同智利气候背景下，最大限度地提高日光透过率，同时降低眩光风险

Q2 Energy

Journal of Daylighting

Pub Date : 2020-06-08 DOI: 10.15627/jd.2020.9

Cecilia Palarino, M. Piderit

It has been shown that in buildings with fully glazed facades designed to save electricity and increase daylight, overheating due to excessive solar gains and glare have become recurrent problems, affecting the quality of the indoor environment in office buildings. Likewise, the focus should not only be on reducing energy consumption but also on providing comfort by applying daylight strategies appropriate to each context. In contexts such as Chile, where there is significant variability of daylight due to the extension of the territory, (17°29'57" S 56°32'12" S) designing with the correct passive solar strategies can become a challenge. The main purpose of this study is to investigate the application of passive solar strategies in side-lit office spaces, focusing on designs that maximise daylight penetration while protecting occupants from the risks of direct solar glare, and on methods to predict the daylight performance. A theoretical model is the prototype of an experimental office, located in three Chilean cities with different prevailing sky conditions, but adapted to the different contexts by integrating the design strategies recommended by the leading entities in advanced energy and daylight design. Daylight performance was evaluated using climate-based daylight modelling, with spatial daylight autonomy, annual sunlight exposure, and useful daylight illuminance metrics, which can integrate the daylight provision and potential glare prediction into a combined approach. This analysis was complemented by using a daylight glare probability index to verify the upper-lit thresholds of the applied methods. This paper provides an easy-to-apply daylight strategies guide for designers and the comparison of the daylight metrics in different climate contexts. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

研究表明，在设计为节省电力和增加日光的全玻璃外墙的建筑中，由于过度的太阳能增益和眩光而导致的过热已成为反复出现的问题，影响了办公楼的室内环境质量。同样，重点不仅应该放在减少能源消耗上，还应该通过应用适合每种情况的日光策略来提供舒适感。在智利等地，由于领土的扩展，日光变化很大，（17°29'57“S 56°32'12”S）采用正确的被动式太阳能策略进行设计可能会成为一项挑战。本研究的主要目的是调查被动式太阳能策略在侧光办公空间中的应用，重点是在最大限度地提高日光透过率的同时保护居住者免受阳光直射风险的设计，以及预测日光性能的方法。一个理论模型是一个实验办公室的原型，该办公室位于智利的三个城市，具有不同的主要天空条件，但通过整合先进能源和日光设计领域的领先实体推荐的设计策略来适应不同的环境。使用基于气候的日光建模评估日光性能，包括空间日光自主性、年度日光暴露量和有用的日光照度指标，这些指标可以将日光供应和潜在眩光预测集成到一种组合方法中。通过使用日光眩光概率指数来验证所应用方法的照明阈值上限，对该分析进行了补充。本文为设计师提供了一份易于应用的日光策略指南，并对不同气候背景下的日光指标进行了比较。©2020作者。由solarlists.com发布。这是一篇基于CC by许可证的开放访问文章(https://creativecommons.org/licenses/by/4.0/)。

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引用次数: 8

Economic and Energy Efficiency of Artificial Lighting Control Systems for Stairwells of Multistory Residential Buildings 多层住宅楼梯井人工照明控制系统的经济性与节能性

Q2 Energy

Journal of Daylighting

Pub Date : 2020-04-13 DOI: 10.15627/jd.2020.8

V. Burmaka, M. Tarasenko, Kateryna Kozak, V. Khomyshyn, Nataliia Sabat

The aim of the research is to determine the economic and energy efficiency usage of the artificial lighting control systems, with the help of astronomical relays and motion sensors, by various types of light sources for the stairwells (stair landings and staircases) of multistory residential buildings. The analysis of the residents’ monthly movement intensity of the 9-story residential buildings through the buildings entrance, doorways, and apartment doors was carried out. The economic and energy efficiency of use the artificial lighting control systems with an astronomical relays and motion sensors with different types of light sources was determined. Regardless of the light sources` type, the astronomical relay’s use leads to reduction in the electricity consumption of artificial lighting in 43.31% – 50.52%. Moreover, the motion sensors’ use on stairwells leads to a significant reduction in electrical energy consumption: in a case of halogen lamps – by 97.73%, compact fluorescent lamps – by 95.27%, light-emitting diodes lamps – by 93.98%. For the first time, the data of 9story residential buildings inhabitants’ traffic intensity through the first-floor doorway for the Ternopil city, Ukraine has been carried out. It has been proved the economic feasibility and energy efficiency of using combined lighting with an artificial lighting control system for stairwells of multistory residential buildings. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

本研究的目的是在天文继电器和运动传感器的帮助下，通过各种类型的光源为多层住宅的楼梯井(楼梯平台和楼梯)确定人工照明控制系统的经济和能源效率使用。通过建筑物入口、门道和公寓门对9层住宅居民的月活动强度进行分析。确定了采用天文继电器和运动传感器的人工照明控制系统在不同类型光源下的经济性和能源效率。无论光源类型如何，天文继电器的使用使人工照明的用电量减少43.31% - 50.52%。此外，运动传感器在楼梯间的使用显著减少了电能消耗:在卤素灯的情况下，减少了97.73%，紧凑型荧光灯减少了95.27%，发光二极管灯减少了93.98%。首次对乌克兰捷尔诺波尔市9层居民楼居民通过一层门口的交通强度进行了数据采集。实践证明，多层住宅楼梯井采用组合照明与人工照明控制系统的经济可行性和节能效果。©2020作者。由solarlits.com出版。这是一篇基于CC BY许可(https://creativecommons.org/licenses/by/4.0/)的开放获取文章。

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引用次数: 4

Daylight Distribution Improvement Using Automated Prismatic Louvre 利用自动棱镜百叶窗改善日光分布

Q2 Energy

Journal of Daylighting

Pub Date : 2020-04-03 DOI: 10.15627/jd.2020.7

A. Eltaweel, M. Mandour, Q. Lv, Yuehong Su

Louvre is a common type of shading devices and has been increasingly used in office buildings. Meanwhile, some reflective types of louvre have been used to provide shade and to redirect daylight deep into buildings interior simultaneously. Furthermore, daylighting systems have been recently engaged with automation control to improve their performance and increase their accuracy. Accordingly, automation of a louvre can optimise daylighting performance, maximising visual comfort, and lighting energy saving. In order to maximise the benefits of daylight, these shading devices should be controlled efficiently using advanced control methods. On the other hand, one of the significant application in daylighting systems is the prismatic panel, which was used in several buildings to improve daylighting due to its easy installation, which also based on redirecting the light into the interior of the buildings, besides its reflective and refractive characteristic. This article presents a feasibility study on the combination of two advanced daylighting designs, i.e., prismatic panel and automated louvre, aiming to achieve simultaneous shading and redirecting daylight for better daylight distribution. In the proposed design, the louvre is comprised of prismatic slats, i.e., prismatic panel as slat. The prismatic louvre is implemented virtually based on an algorithmic system using parametric software Grasshopper, in order to control the automation process parametrically as a first step, and then the daylighting performance is simulated using Radiance as a plug-in to Grasshopper. The optical characteristics of the prismatic slats in an automated louvre is investigated. A comparison has been made in simulation between a prismatic panel and the automated louvres with reflective slats and prismatic slats, respectively, to evaluate their daylighting performance in a south-orientated virtual room in New Cairo. The simulation results are given for the conditions of clear sky on the 21st of June, 21st of September, and 21st of December. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

罗浮蓬是一种常见的遮阳装置，在办公建筑中的应用越来越多。与此同时，一些反光类型的百叶窗被用来提供遮阳，同时将日光引导到建筑内部。此外，采光系统最近已参与自动化控制，以提高其性能和提高其准确性。因此，百叶窗的自动化可以优化采光性能，最大限度地提高视觉舒适度，并节约照明能源。为了最大限度地利用日光，这些遮阳装置应该使用先进的控制方法进行有效控制。另一方面，在采光系统中的一个重要应用是棱镜面板，由于其易于安装，它被用于几座建筑物中，以改善采光，这也是基于将光线重新定向到建筑物内部，除了它的反射和折射特性。本文提出了两种先进采光设计的可行性研究，即棱镜面板和自动百叶窗，旨在同时实现遮阳和重新定向日光，以更好地分配日光。在建议的设计中，罗浮宫由棱柱形板条组成，即棱柱形面板作为板条。采用参数化软件Grasshopper，基于算法系统虚拟实现了棱镜天窗，首先实现了自动化过程的参数化控制，然后利用Radiance作为Grasshopper的插件对采光性能进行了模拟。研究了自动百叶窗中棱镜板的光学特性。在模拟中比较了棱镜面板和带有反射板和棱镜板的自动百叶，以评估它们在新开罗一个面向南方的虚拟房间中的采光性能。给出了6月21日、9月21日和12月21日晴空条件下的模拟结果。©2020作者。由solarlits.com出版。这是一篇基于CC BY许可(https://creativecommons.org/licenses/by/4.0/)的开放获取文章。

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引用次数: 11

Power Factor Correction of Compact Fluorescent and Tubular LED Lamps by Boost Converter with Hysteretic Control 基于滞后控制升压变换器的紧凑型荧光灯和管状LED灯功率因数校正

Q2 Energy

Journal of Daylighting

Pub Date : 2020-04-02 DOI: 10.15627/jd.2020.6

J. Revelo-Fuelagán, J. Candelo-Becerra, F. E. Hoyos

Compact Fluorescent Lamps (CFLs) and Light-emitting Diode (LED) lamps have received wide acceptance in lighting applications during the last few years. However, without a power factor correction (PFC), the lamps reach a lagging power factor below 0.64 while the total harmonic distortion (THD) in the input current can be over 136%. Therefore, this paper presents an efficient, small size, low cost, and analog technology based on PFC for CFLs and tubular LED lamps. The topology to couple the line with the ballast of the lamp consists of a boost electronic converter under a hysteretic controller that is designed based on hysteretic current mode control. Besides, an experimental prototype is implemented with the PFC applied to a 15 W CFL and 12 W tubular LED lamp. The results show that the prototype corrects the lagging power factor to a value close to 0.98 and that harmonic levels are obtained below the limits set by the IEC 61000-3-2 Class C standard. Furthermore, the test showed that lamps with the PFC can be switched on and off more times than lamps without the PFC due to the low THD produced in the CFL, thus avoiding abrupt changes in the line current. These results are promising, as the controller does not require a compensation ramp as in other PWM control strategies, and it can be adapted to any type of lamp that draws a pulsating input current. In addition, the proposed controller could be applied to correct the power factor or regulate voltage for other applications, as it is an autonomous control technique with compact implementation. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

在过去的几年里，紧凑型荧光灯（CFL）和发光二极管（LED）灯在照明应用中得到了广泛的接受。然而，在没有功率因数校正（PFC）的情况下，灯达到低于0.64的滞后功率因数，而输入电流中的总谐波失真（THD）可以超过136%。因此，本文提出了一种高效、小型、低成本、模拟的基于PFC的CFL和管状LED灯技术。将线路与灯的镇流器耦合的拓扑结构由基于滞后电流模式控制设计的滞后控制器下的升压电子转换器组成。此外，还将PFC应用于15W CFL和12W管状LED灯，实现了实验样机。结果表明，原型将滞后功率因数校正到接近0.98的值，并且谐波水平低于IEC 61000-3-2 C级标准设定的限值。此外，测试表明，由于CFL中产生的低THD，具有PFC的灯可以比没有PFC的灯具更多地开关，从而避免了线路电流的突然变化。这些结果是有希望的，因为控制器不需要像在其他PWM控制策略中那样的补偿斜坡，并且它可以适用于汲取脉动输入电流的任何类型的灯。此外，所提出的控制器可以用于校正功率因数或调节其他应用的电压，因为它是一种实现紧凑的自主控制技术。©2020作者。由solarlists.com发布。这是一篇基于CC by许可证的开放访问文章(https://creativecommons.org/licenses/by/4.0/)。

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引用次数: 5

Parametric Analysis of Architectural Elements on Daylight, Visual Comfort, and Electrical Energy Performance in the Study Spaces 学习空间中采光、视觉舒适和电能性能的建筑元素参数化分析

Q2 Energy

Journal of Daylighting

Pub Date : 2020-03-24 DOI: 10.15627/jd.2020.5

N. Nasrollahi, E. Shokry

The quality of visual comfort has always been an essential element considering human comfort. Providing visual comfort in a living environment reduces the need for artificial lighting, which subsequently has a direct relationship with energy consumptions and its expenses. Besides, the maximum possible usage of daylight instead of artificial lighting significantly contributes to providing a favourable condition in terms of visual comfort for the residents. This essential factor is manifested in public spaces, such as libraries that are associated with students and the quality of their study time. The main aim of this paper is to provide applied solutions to use more natural lighting strategies as an alternative for artificial lighting, which helps to reduce electric energy consumption while providing visual comfort for users. The role of architectural elements, such as the position and dimensions of the windows, reflectivity of materials, layout of surfaces, and appropriateness of space in line with the objectives as mentioned earlier are examined thoroughly. For this purpose, literature studies, as well as computer simulations via Relux software, are utilized to investigate the set research objectives. Finally, the simulation results suggest that the best orientation to achieve the optimal model using daylight in study spaces is northernsouthern orientation. In addition, using windows with maximum height in the middle of the transverse front of buildings with window to wall ratio of 35 to 45 percent along the vertical and horizontal divisions (grid) is suitable for such places. Design criteria include the higher access to daylight, visual comfort, and reduction of electrical energy consumption. The reflectivity coefficients for roof materials, floor, and walls are 0.6, 0.4, 0.4, and 0.6, respectively, and transparency for windows is 80%. The obtained results also suggest the length-to-width ratio and height-to-width ratio are 6-to-5 while horizontal and vertical surfaces in near windows and in middle space along the longitudinal direction are optimal for research purposes. © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

视觉舒适的质量一直是考虑人类舒适度的基本要素。在生活环境中提供视觉舒适减少了对人工照明的需求，这随后与能源消耗及其费用有直接关系。此外，最大限度地利用日光而不是人工照明，大大有助于为居民提供视觉舒适的有利条件。这一重要因素体现在公共空间，如图书馆，与学生和他们的学习时间的质量。本文的主要目的是提供应用解决方案，使用更多的自然采光策略作为人工照明的替代方案，这有助于减少电能消耗，同时为用户提供视觉舒适。建筑元素的作用，如窗户的位置和尺寸、材料的反射率、表面的布局，以及与前面提到的目标一致的空间的适当性，都经过了彻底的检查。为此，我们利用文献研究和通过Relux软件进行的计算机模拟来对设定的研究目标进行调查。最后，模拟结果表明，在学习空间中使用日光实现最佳模型的最佳朝向是南北朝向。此外，沿垂直和水平划分(网格)，在建筑物横向正面的中间使用最大高度的窗户，窗墙比为35%至45%，适合这些地方。设计标准包括更高的采光、视觉舒适和减少电能消耗。屋顶材料、地板和墙壁的反射率系数分别为0.6、0.4、0.4和0.6，窗户的透明度为80%。研究结果还表明，长宽比和高宽比为6比5，而靠近窗户的水平和垂直表面以及沿纵向方向的中间空间是最适合研究的。©2020作者。由solarlits.com出版。这是一篇基于CC BY许可(http://creativecommons.org/licenses/by/4.0/)的开放获取文章。

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引用次数: 12

Experimental Analysis of the Performance of Light Shelves in Different Geometrical Configurations Through the Scale Model Approach 用比例模型法对不同几何构型轻型货架性能的实验分析

Q2 Energy

Journal of Daylighting

Pub Date : 2020-03-03 DOI: 10.15627/jd.2020.4

P. Zazzini, A. Romano, A. D. Lorenzo, Valeria Portaluri, A. D. Crescenzo

Daylight plays a significant role in achieving energy saving and comfort in buildings. It is in accordance with the human circadian rhythms and allows the best visual conditions in work environments and residential buildings. Recently, numerous researchers have focused their attention on the performance of technological devices able to increase natural light availability in interior areas of buildings. Among them, light shelves are commonly used with the aim of improving the depth of daylight penetration, trying to reduce the nonuniform diffusion of light entering from vertical windows. In this paper, the authors propose six different configurations of an internalexternal light shelf and analyse their performance using the experimental scale model approach under real sky. Although the method is not very accurate as deduced from literature on this topic, the authors still demonstrate its usefulness in examining different geometric configurations of light shelves. In fact, even if the results highlight inaccuracies in the method used, which are accentuated under direct sun light, they are useful for considerations in the comparative analysis, particularly in regard to data logged under partially completely cloudy skies albeit with the awareness that light shelves’ effectiveness is improved under direct sun light. Despite its limits, the method is simple to use and can be considered efficient in allowing the authors to carry out considerations regarding the performance of the system analysed. Among the six different configurations proposed two seem to be the most efficient and are characterized by the presence of an internal highly reflecting surface applied on the ceiling and an external one with two different inclination angles (10° and 20°). © 2020 The Author(s). Published by solarlits.com. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

日光在实现建筑节能和舒适方面发挥着重要作用。它符合人类的昼夜节律，在工作环境和住宅建筑中提供最佳的视觉条件。最近，许多研究人员将注意力集中在能够增加建筑物内部自然光可用性的技术设备的性能上。其中，通常使用光架，目的是提高日光穿透的深度，试图减少从垂直窗户进入的光的不均匀扩散。在本文中，作者提出了六种不同的内外光架配置，并使用实验尺度模型方法分析了它们在真实天空下的性能。尽管该方法不像从该主题的文献中推导的那样非常准确，但作者仍然证明了它在检查光架的不同几何配置方面的有用性。事实上，即使这些结果突出了所用方法的不准确之处，在阳光直射下会更加突出，但它们也有助于比较分析中的考虑，特别是在部分完全多云的天空下记录的数据，尽管人们意识到在阳光直射的情况下，光架的有效性会提高。尽管有局限性，但该方法使用简单，可以被认为是有效的，允许作者对所分析的系统的性能进行考虑。在提出的六种不同配置中，有两种似乎是最有效的，其特点是天花板上有一个内部高反射表面，而外部则有两个不同的倾角（10°和20°）。©2020作者。由solarlists.com发布。这是一篇基于CC by许可证的开放访问文章(http://creativecommons.org/licenses/by/4.0/)。

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引用次数: 14