A glazing unit for solar control, daylighting and energy conservation

Lorenz, Werner

doi:10.1016/s0038-092x(00)00132-8

Cited by 21 publications

(6 citation statements)

References 12 publications

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“…[43] On the other hand daylighting control system should pay attention to the effect of sunlight and daylight in interior heating and cooling energy demand.…”

Section: Discussionmentioning

confidence: 99%

Parametric optimization of daylight and thermal performance through louvers in hot and dry climate of Tehran

Mahdavinejad¹,

Mohammadi²

2018

J. Fundam and Appl Sci.

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This article describes a parametric research simulated different louver conditions performance under given climate. The DIVA (Design, Iterate, Validate and Adapt) plug-in for Rhinoceros/Grasshopper software is used as the main tool, given its ability to effectively calculate daylight metrics (using the Radiance/Daysim engine) and energy consumption (using the EnergyPlus engine). The optimization process is carried out parametrically controlling the shadings' geometries. Genetic Algorithms (GA) embedded in the evolutionary solver Octopus is adopted in order to achieve close to optimum results by controlling iteration parameters. The results of the paper show that there are meaningful optimum parameters which may help for better thermal performance through louvers in hot and dry climate of Tehran. The results indicate impressive efficiency in building industry in contemporary architecture of developing countries especially in Iran and west of Asia.

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“…[43] On the other hand daylighting control system should pay attention to the effect of sunlight and daylight in interior heating and cooling energy demand.…”

Section: Discussionmentioning

confidence: 99%

Parametric optimization of daylight and thermal performance through louvers in hot and dry climate of Tehran

Mahdavinejad¹,

Mohammadi²

2018

J. Fundam and Appl Sci.

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“…The daylight intensity at any point inside a room is subject to severe and frequent fluctuations, but it is, however, found to bear a constant ratio for the simultaneous external intensity when the sky is clear or overcast [15]. It is expressed in terms of intensity of day light illumination inside a room at any point in any plane as a ratio or percentage of the simultaneous intensity in a horizontal plane at an outside point open to the entire sky vault.…”

Section: Daylight Factormentioning

confidence: 99%

Assessment of Design Sky for Design of Day Lighting in Buildings in Capital Region Delhi, India.

2018

IJLTET

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INTRODUCTIONThe primary function of a window/opening is allowing daylight for daytime functional activities in adequate quantity for efficient performance. It is essential to take the maximum advantage of the free source of illumination energy when the artificial lighting illumination is so extravagantly consuming the natural fuel sources and grossly expensive. The accepted minimum level of daylight for the performance of various activities varies from one functional space to another. Recent Studies have emphasized [2,4,17] that the quality of light produced by the sun and sky is a very dynamic and attractive reason for day lighting. As per IES Lighting Handbook of 10h Edition, [11,12] the daylight autonomy appears to be simple, the percentage of sensors to achieve a desirable luminance level of typical 300 lux with regard to operating period and it ma y also includes spatial daylight autonomy. It also pave a way to understand other dynamic daylight metrics, continuous daylight autonomy, maximum daylight autonomy and useful daylight luminance. [9]. A poor quality of daylight may result in discomfort and a loss in visibility, which may cause a decrease in human performance and productivity. This, in turn, may lead increased use of the space, resulting in additional energy consumption [20]. Reinhart [21] had emphasized the dynamic daylight performance metrics for sustainability in building. The importance day lighting has been emphasized with automated roller shades in an office building [22]. The historical buildings in India were designed with courtyards to bring sunlight into the core of the buildings and overhangs appropriately sized to shade the interior from the summer sun [10]. Even after the advent of the electric light, buildings were still designed to have large amount of perimeter area to provide adequate ventilation and day lighting. Accordingly the desired daylight factors i.e. the percentage of daylight to be admitted through a window/opening from the hemisphere of the unobstructed sky. The amount of light admitted depends on the size of the window/opening or window/openings in relation to the area of the room, the depth of the room to which useful light will penetrate depends on the area of the window/opening and the height of the head of the window/opening above floor level. Daylight intensity varies considerably both hourly and daily due to the rotation of the earth and the consequent relative position of the sun and also due to the climatic variations from clear to overcast skies. In order to make a prediction of relative levels of daylight indoors it is necessary to make accurate calculations of available day light intensity on that area or zone. The concept of day light has the advantage that it is a comparative value of the intensity of daylight indoors at different points so that even though the intensity of day light outdoors will vary but the relative indoor intensity will remain more or less the same. The daylight concept presents better

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“…The study found that the laser cut panels can uniformly distribute daylight inside the classroom, and it can potentially increase the daylight factor (DF) up to 50%. Meanwhile, the application of prismatic windows was investigated in previous studies to enhance the illumination in the deep-plan room [21], which can reach up to 40% of energy-saving [11,22].…”

Section: Introductionmentioning

confidence: 99%

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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A glazing unit for solar control, daylighting and energy conservation

Cited by 21 publications

References 12 publications

Parametric optimization of daylight and thermal performance through louvers in hot and dry climate of Tehran

Parametric optimization of daylight and thermal performance through louvers in hot and dry climate of Tehran

Assessment of Design Sky for Design of Day Lighting in Buildings in Capital Region Delhi, India.

Daylight Distribution Improvement Using Automated Prismatic Louvre

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