A prismatic daylight redirecting fenestration system for southern skies

Mashaly, Islam A.; Nassar, Khaled; El-Henawy, Sally I.; Mohamed, Mohamed W.N.; Galal, Ola; Darwish, Ali; Hassan, Osama N.; Safwat, Amr M. E.

doi:10.1016/j.renene.2017.02.048

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…The prismatic panel was exploited to provide daylight inside the deep room [9], where the incident light striking the prismatic panel is reflected into the ceiling, then the ceiling act as a diffuse light to illuminate in the deep-plan room, as seen in Fig. 1.…”

Section: Hypothesismentioning

confidence: 99%

“…Nowadays, fenestration systems dramatically evolved via using advanced tools [3] and new materials [4], which probably can improve daylighting performance [5] to achieve further coverage distance from the window [6,7]. There are many advanced kinds of fenestration systems, such as; electrochromic glazing [8], energy-saving film, prismatic panel [9], transparent shading device [10], automated system [11], kinetic systems [12], parametric system [13], optical louver system (OLS) [14], hybrid lighting system [15], etc. However, daylighting systems are still a challengeable issue in practice, due to their size, cost, controlling methods, maintenance, feasibility and energy-saving limitation [16].…”

Section: Introductionmentioning

confidence: 99%

“…In the 1890s [18], the use of prismatic glass was widespread as a way of redirecting daylight inside the building interior. The implementations of prismatic panels can be seen in several buildings' elements, such as sidewalk vault lights [19], glass blocks, glass panels [9], prismatic tiles, laser cut panels, etc. which are mainly used to reflect sunlight toward rear areas in the building.…”

Section: Introductionmentioning

confidence: 99%

“…(a) The use of prismatic panel as a redirector system and (b) detailed cross-section for the system[9].…”

mentioning

confidence: 99%

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Daylight Distribution Improvement Using Automated Prismatic Louvre

Eltaweel

Mandour

et al. 2020

Journal of Daylighting

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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.

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Section: Hypothesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…(a) The use of prismatic panel as a redirector system and (b) detailed cross-section for the system[9].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Daylight Distribution Improvement Using Automated Prismatic Louvre

Eltaweel

Mandour

et al. 2020

Journal of Daylighting

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“…Moreover, the automated blinds were investigated to optimize daylighting [8] and enhance thermal performance simultaneously, by controlling the rotation angles of the blinds with response to the sun movement [14]. Further researches investigated fenestration systems for the sake of providing diffuse light and redirection [15], for instance, perforated sheets were used for scattering the daylight, likewise, translucent materials [16] and prismatic panels [17]. These fenestration systems depend on distributing the daylight based on penumbra effect [18], scattering the daylight via using diffusing materials and redirecting attributes via using prismatic properties [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Suitability of a Parametrically Controlled Louvers for Various Orientations throughout a Year Comparing to an Existing Case

Eltaweel

2017

Buildings

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Nowadays, daylighting systems and shading devices are controlled automatically to achieve their optimum benefits. For more comprehensive accuracy, parametric control was recently used to manage complex parameters with more accuracy. Such a system was proposed and investigated in a previous research to provide steadier and more uniform daylight illuminance during the day and reduce more than 80% of the electricity consumption. This study is examining the daylighting performance by using the parametric system in different orientations and comparing with the conventional ones. Furthermore, the study will evaluate the suitability of the parametric system throughout the year during the working hours in a typical office room.

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Artificial Phototropic Systems for Enhanced Light Harvesting Based on a Liquid Crystal Elastomer

Yan

Zhao

Alsaid

et al. 2021

Advanced Intelligent Systems

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Oblique‐incidence‐induced energy‐density loss (OEL) is a universal problem which affects nearly all processes involving electromagnetic waves, especially sunlight harvesting. Technologies (solar concentrating plants, large scale systems, etc.) are developed to address this issue, albeit with limitations such as complex design, large size, and high cost. Inspired by nature, artificial phototropism is developed to accurately follow the light direction without complex motors system and electronical control. However, the existing systems are limited by small tracking operation windows, low robustness, or the requirement of high‐power input. Herein, a system is reported that is versatile, low cost, mechanically strong, and can achieve large‐angle reorientation driven by unconcentrated sunlight. This system is demonstrated to be able to recover the OEL for photovoltaics as well as solar vapor generation (SVG) processes. Compared with the nonphototropic system, it can achieve 447% output in lab and 155% in real‐life applications. The principle behind our artificial phototropic system is universal and can be extended to many optical applications, especially sunlight harvesting.

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A prismatic daylight redirecting fenestration system for southern skies

Cited by 17 publications

References 8 publications

Daylight Distribution Improvement Using Automated Prismatic Louvre

Daylight Distribution Improvement Using Automated Prismatic Louvre

Evaluation of Suitability of a Parametrically Controlled Louvers for Various Orientations throughout a Year Comparing to an Existing Case

Artificial Phototropic Systems for Enhanced Light Harvesting Based on a Liquid Crystal Elastomer

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