Design optimisation of perforated solar façades in order to balance daylighting with thermal performance

Doris, A.; Moreno, David; Casas, Jaime Navarro

doi:10.1016/j.buildenv.2017.09.007

Cited by 60 publications

(31 citation statements)

References 30 publications

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“…Through the DOA method, it was concluded that perforation ratios, distribution, shape of holes and orientation must be addressed simultaneously to increase the daylit area by 33% and to reduce the overlit area by 35%. In [13], the DOA method was also applied to investigate the thermal performance of thin PS. Four design characteristics were simultaneously evaluated, concluding that thin screens can achieve a 55% reduction in the total annual energy use.…”

Section: Background: Solar Screens Studymentioning

confidence: 99%

A Comprehensive Evaluation of Perforated Façades for Daylighting and Solar Shading Performance: Effects of Matrix, Thickness and Separation Distance

Pool¹

2019

Journal of Daylighting

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New design tools have enabled architects to explore complex geometries for building envelopes. Perforated Screens (PS) have gained popularity but their design is still intuitive, often focused on aesthetic and morphological criteria. Yet, there is a lack of guidelines or quantitative standards for designing optimal PS, in terms of their daylight provision, views outside, solar shading or energy performance. Since PS can greatly influence the interior conditions, it is essential to understand the effect of screen parameters, such as thickness, perforation percentage, separation distance, and others that are often manipulated by designers. This paper analyses the daylighting and shading performance of thick PS in office buildings. Five design parameters were simultaneously tested in terms of the annual daylight and solar irradiance contribution. Simulations were performed with DIVA-for-Grasshopper and the following metrics were accounted: useful daylight illuminance, actual daylight availability, and shading coefficients. Three orthogonal arrays allowed the selection of 64 PS configurations as representatives. The overall average of every metric was used as an approach to select all factors having a mean significantly different. The mean values were then established as 'Preferable' targets. Finally, design guidelines to plan thick PS used in front of South, East, and West glazed façades, in a Mediterranean climate, were proposed. The results highlighted the importance of selecting appropriate values for every design parameter to enhance the integrated performance of thick PS.

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Section: Background: Solar Screens Studymentioning

confidence: 99%

A Comprehensive Evaluation of Perforated Façades for Daylighting and Solar Shading Performance: Effects of Matrix, Thickness and Separation Distance

Pool¹

2019

Journal of Daylighting

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“…As one of the most commonly used external shading devices, a solar screen can efficiently scatter and redirect daylight [12]. Numerous studies have been conducted on improving the shading performance of solar screens by optimizing their geometrical dimensions, perforation percentages, and textures [13][14][15]. Moreover, much research has been conducted on 2 of 19 using solar screens more effectively by adjusting their application methods on the basis of the facade orientation and shading periods [16].…”

Section: Introductionmentioning

confidence: 99%

Nonuniform Woven Solar Shading Screens: Shading, Mechanical, and Daylighting Performance

Lin

Liu

et al. 2019

Sustainability

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This study investigated the potential of using a nonuniform woven panel with nonuniform strips—thick sticks and thin battens—as an external solar shading screen that addressed daylighting, shading, and mechanical performance factors. The sustainable material, namely, bamboo, was used as the demonstration material for the screen. An on-site experiment and ANSYS simulation were carried out to investigate the basic solar optical performance and structural strength of the proposed screen, respectively. Then, a series of daylighting simulations were conducted to optimize the configuration of the screen. The results showed that the nonuniform woven solar shading screen reduced up to 80.3% of the solar radiation gain in a room during summer months while ensuring a relatively even distribution of useful daylight during the year. Moreover, the screen effectively reduced the negative impact of glare to a level below “imperceptible” and enabled a relatively clear view through the window and shading. Regarding the structural strength, the screen with a size smaller than or equal to 1 × 1 m withstood a wind load of 12 m/s. Furthermore, this study proposed two optimal configurations: a screen woven of square sticks and battens with a distance of 10 mm between them, and a screen woven of round sticks and battens with a distance of 8 mm between them. This study illustrated the superiority of the nonuniform woven solar shading screens, which supports a wider application of solar shading screens made of other materials with similar structures and reflectance values.

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“…The building envelope plays a very important role in controlling different environmental influences. Adequate building envelope can contribute to reducing harmful environmental impacts by about 80% [5]. Windows, as a transparent part of the facade, are often perceived as "Achilles heel of facade", as they contribute both to heat losses and to unwanted heat gains [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of external solar shading usage on energy consumption and thermal comfort in the student dormitory in Niš

et al. 2019

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External fixed shadings are largely used to provide solar protection for building glazed surfaces. They are reducing heat gains and sensational visual discomfort caused by excessive daylighting. This paper presents a comparative study on external aluminium fixed shadings used on a student dormitory on different orientations and different slat angles. The purpose is to determine which slat angles are best to use in different orientations, from the point of view of energy consumption, thermal comfort, and daylighting. An analysis of annual energy consumption of the student dormitory was performed by using the software EnergyPlus, whereas the model of the building was created using SketchUp and OpenStudio software. Then, a parametric study was carried out by changing slat angles and building orientations, in order to find the best-balanced results with no occupant discomfort and possible energy savings. Results have shown that by considering the most balanced results between energy savings and thermal comfort, the best angles of the slats are from 105˚ to 120˚ on the south side, and from 45˚ to 75˚ on the east and west sides. By installing external shading devices, indoor thermal conditions are improving and may lead to significant energy savings, compared to a building without shading devices.

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Design optimisation of perforated solar façades in order to balance daylighting with thermal performance

Cited by 60 publications

References 30 publications

A Comprehensive Evaluation of Perforated Façades for Daylighting and Solar Shading Performance: Effects of Matrix, Thickness and Separation Distance

A Comprehensive Evaluation of Perforated Façades for Daylighting and Solar Shading Performance: Effects of Matrix, Thickness and Separation Distance

Nonuniform Woven Solar Shading Screens: Shading, Mechanical, and Daylighting Performance

Effect of external solar shading usage on energy consumption and thermal comfort in the student dormitory in Niš

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