A parametric approach for achieving optimum daylighting performance through solar screens in desert climates

Wagdy, Ayman; Fathy, Fatma

doi:10.1016/j.jobe.2015.07.007

Cited by 48 publications

(27 citation statements)

References 11 publications

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“…Wagdy and Fathy [55] developed an interesting shading solution for desert environments called 'solar screen' (see Figure 9b). This device is able to block direct sunlight while allowing the indirect light component to be diffused into the space thanks to multiple reflections from the external blades to the interior ceiling.…”

Section: External Shading Devicesmentioning

confidence: 99%

“…Overhangs [34,47,49,50,57] Well suited for south-oriented rooms, often necessary to avoid overheating in the summer at low latitude climates Louvers [20,31,34,38,39,46,51] Well suited for east and west orientations, fixed devices often require additional internal blinds and work better under clear sky conditions Solar screens [55] Downward tilt angles and 1:1 louvers depth ratio are optimal solutions for achieving good spatial daylight availability without the risk of glare Movable blinds [42] External semi-transparent blinds, together with light shelves, improve illuminance uniformity…”

Section: External Shading Devicesmentioning

confidence: 99%

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A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

2017

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Abstract:The study of daylight conditions within educational buildings has been a topic of interest since the nineteenth century in western countries, and European ones in particular. Although it has been argued that providing a view outside-or even using daylight instead of more stable and manageable artificial light-could reduce students' performance without providing a pleasant and healthy environment, nowadays it seems that a large consensus upon the need to design well daylit spaces is being reached. This paper reviews how the research community has tackled the task of understanding and solving the complex relationships amongst local climate, users' needs and design constraints in school buildings by showing the different approaches used and technological solutions suggested. The reported case studies, based either on experimental measurements or on simulations, highlight the need of a comprehensive approach to the topic to fully understand the non-trivial requirements of a daylit educational environment.

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Section: External Shading Devicesmentioning

confidence: 99%

Section: External Shading Devicesmentioning

confidence: 99%

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

2017

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“…A study by A. Freewan investigated the combination of ceiling shapes and light shelves to enhance daylight distribution inside a deep room [17]. Meanwhile, recently developed parametric software such as Grasshopper offers an efficient tool with a link to the popular software RADIANCNE and DAYSIM [18] and therefore be able to control and optimize daylighting systems [19]. Overall, we can find that recent technologies of several architectural elements have clear influence on daylighting performance, while they are using different keys to achieving the goal of saving energy.…”

Section: Introductionmentioning

confidence: 99%

Using integrated parametric control to achieve better daylighting uniformity in an office room: A multi-Step comparison study

Eltaweel

2017

Energy and Buildings

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In addition to windows, louvers are the most common architectural elements widely used in office buildings to protect them from excessive daylight and improve daylight penetration as well. Advanced glazing, window blinds, other fenestration systems and their automation can further improve daylighting performance. However, the stability and uniformity of daylight distribution throughout a day inside a building remain a challenge. To explore a solution for this issue, this paper proposes an advanced integrated lighting system combining different architectural elements, which can be controlled parametrically. The suitable design of such integrated system is identified through a multi-step comparison study employing parametric design approach. The criteria is to keep a relatively uniform daylight distribution in the range of 300 -500 lux over 90% of the whole desktop area in a 7-meter-deep office room. An office building in New Cairo was chosen for a case study, where it is south oriented with a prevailing condition of clear sky. Hourly results on the 21 st of several chosen months are given to show the suitability of the proposed design throughout a year, aiming to explore the maximum use of daylight and hence reduce the energy consumption of electrical lighting. The comparison indicates that the combined use of the integrated system can achieve a satisfactory relatively uniform distribution of daylight over about 90% of the desktop area, within illuminance range of 300 -500 lux for most of the working hours throughout a year.

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“…In addition, it can make simulation in the 4 th dimension using the time aspect which can influence on the building in the real time, and how the time can change the performance of the building parametrically. So we can anticipate and solve many design issues the early stages of design [31][32][33]. …”

Section: In Environmental Studymentioning

confidence: 99%

“…Louvers design was investigated in a previous research [31] using parametric approach by exploring all possible screen configurations in daylighting. The method was done by using a parallel computing algorithm that allowed a better understanding of the effect of the louvers parameter and their interaction on daylighting performance.…”

Section: Louvers Designmentioning

confidence: 99%

Parametric design and daylighting: A literature review

Eltaweel

2017

Renewable and Sustainable Energy Reviews

141

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In the history, architecture was exploited to the human being to protect him from unsteady environmental conditions. In the past centuries, architecture was pioneer art which has special features such as; simplicity, organization, clear style, accurate decoration, material assembly, and so on. However, modern buildings become complex products that have so many parts which have to fulfil different functions. Therefore, new computational ways and techniques have been developed to facilitate the design of modern complicated buildings and to create a convenient quantitative relationship between the environment and the envelope, putting into consideration the obstacles which influence on the building design. This has therefore formed the concept of parametric design in architecture, in order to deal with complex designs and gain more accurate results. Modern architects claim that parametric design is the most creative way to understand the development and complexity of the new era of architectural trends [1]. Meanwhile, it is really hard to deal with sophisticated details in buildings using our brains to imagine, or conventional ways to design [2]. In addition, building technologies nowadays are integrated and containing many disciplines in the same time, and each discipline is dependent on the other disciplines in a very complex vast connections. Hence, they should be organized in a database container, and this container could be managed parametrically using parametric design as an advanced way to explore and understand these sophisticated relations [3]. This paper hence presents a literature review on parametric design in architecture practice and put a focus on its applications in daylighting and solar radiation, which can have an essential impact on improving daylight availability and energy saving.

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A parametric approach for achieving optimum daylighting performance through solar screens in desert climates

Cited by 48 publications

References 11 publications

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

A Review of Daylighting Strategies in Schools: State of the Art and Expected Future Trends

Using integrated parametric control to achieve better daylighting uniformity in an office room: A multi-Step comparison study

Parametric design and daylighting: A literature review

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