Optimization of useful daylight illuminance vs. drag force for vertical shading fins/panels

Brzezicki, Marcin; Regucki, Paweł

doi:10.1080/23744731.2020.1858679

Cited by 7 publications

(7 citation statements)

References 28 publications

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“…The choice of other types of glazing should also be examined, preferably in conjunction with the possibility of varying the orientation of the building. Interesting studies have also appeared [64], which analyzed the geometry of the ceiling in the exhibition room, and the geometry of the façade fins/louvers [65]. In planned future research, it seems necessary to consider the aspect of roof and ceiling shape and its influence on daylight distribution.…”

Section: Discussionmentioning

confidence: 99%

An Evaluation of Annual Luminous Exposure from Daylight in a Museum Room with a Translucent Ceiling

Brzezicki

2021

Buildings

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The current study investigates the issue of computer-aided daylight evaluation in a museum room with a dropped translucent ceiling. In this type of room, daylight is admitted through classic windows located in the facade and then distributed in the plenum, which is located above the exhibition space and transmitted through the translucent ceiling into the museum room. This illumination method enables guiding daylight deep into the room, excluding the impact of direct solar radiation. The presented study is based on data obtained through computer-aided daylight simulation by DeLuminæ (DL-Light, ver. 11.0.9) software using the Radiance software for all calculations and real weather data for Wroclaw, Poland. A museum room of 12 × 12 m with three different heights of the plenums was simulated to establish an optimal relation of the width to height plenum ratio. Next, the annual exposure in K lx·h/year was calculated, as sensitive works of art may be subjected to damage caused by light exposure. To further reduce illumination, the simulation of an automatic shading system in the form of horizontal louvers was performed. The system was activated when certain illumination values were detected by the sensor on the building’s roof.

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Section: Discussionmentioning

confidence: 99%

An Evaluation of Annual Luminous Exposure from Daylight in a Museum Room with a Translucent Ceiling

Brzezicki

2021

Buildings

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“…Standard blinds in different orientations and PV blinds in different scenarios are a field of vibrant scientific discussion. In 2007, Gratia and De Herde [10] studied the most efficient position of shading devices in a double-skin facade; in 2010, Palmero-Marrero and Oliveira [6] showed the effect of louvre shading devices on the energy requirements of a building; in 2014, Manzan [11] employed a genetic algorithm for the analysis of the most efficient position of shading devices; in 2017, Azmi et al [12] studied a west-facing window in the context of a green office building; in 2018, Atzeri et al [13] conducted a performance analysis of different glazing systems coupled with three shading control strategies; in 2021, Brzezicki and Regucki presented a paper including the optimization of the number of shading fins according to two variables: daylight distribution and the drag force induced on the elements of the shading system [14].…”

Section: Literature Review: Standard Blinds and Pv Blinds In Different Scenariosmentioning

confidence: 99%

“…The selection of the type of shading elements was made according to the procedure described in the most recent paper published by the authors [14]. This analysis showed that various types of blinds and shutters are used, which have different angles and orientations.…”

Section: Selection Of Shading Elementsmentioning

confidence: 99%

“…In response to this, the presented paper concentrates on the optimization of rotating vertical shading fins that are located along the facade and which track the azimuthal position of the Sun. Moreover, the reasons for the choice of vertical fins are strictly utilitarian ones: (i) there is no accumulation of snow or dust on the vertical fins; (ii) fins in vertical orientation are optimal in terms of mechanical design because the vertical orientation is less susceptible to the forces generated by wind or gravity which lowers the material use and-in the result-the maintenance costs; (iii) fins in vertical orientation provide much better conditions for the outside view according to European Standard EN17037 because they block a smaller portion of the view; (iv) previous research proved that vertical fins can regulate the level of daylight inside a room successfully while significantly reducing the drag force, see [14]. However, it has to be noted that in areas without shading, patches of very high brightness occur, which disturbs the outside view in large offices, as addressed by Katunský et al [26].…”

Section: Selection Of Shading Elementsmentioning

confidence: 99%

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Optimization of Useful Daylight Illuminance for Vertical Shading Fins Covered by Photovoltaic Panels for a Case Study of an Office Room in the City of Wroclaw, Poland

2021

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A building’s facade is its main interface with the external environment, as it controls almost all energy flows in the building—losses and gains. In this context, the most recent invention of adaptive façades allows for the introduction of an optimized system for both daylight management and electrical energy production. The authors of the presented paper propose a novel adaptive façade system that is equipped with vertical shading fins of 1 × 4 m that are covered with PV panels. The fins are kinetic and rotate around a vertical axis in order to optimize solar irradiation for producing electricity. The presented adaptive façade is analyzed in two stages. Firstly, the number of vertical shading fins is optimized in the context of useful daylight illuminance (UDI) and daylight glare probability (DGP) using Radiance-cored software. Next, two scenarios of PV installation are verified for fixed and the Sun-tracking solution. The results show that the Sun-tracking system is more efficient than the fixed one, but electricity production is only increased by 3.21%. The reason for this is the fact that—while following the Sun’s azimuth position—fins shade each other and reduce the effective area of the adjacent PV panels. Based on this, the authors conclude that the Sun-tracking system might be justified due to its protective or decorative function and not because of its improved effectiveness in generating electrical energy.

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“…The fact that the main strategy adopted is to further the increase in visual comfort (an increase in UDI and reduction in DGP) also demonstrates the innovativeness of the presented approach. UDI was successfully used in a previous publication by the author to evaluate the level of daylight [50].…”

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confidence: 99%

An Evaluation of Useful Daylight Illuminance in an Office Room with a Light Shelf and Translucent Ceiling at 51° N

Brzezicki

2021

Buildings

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The present study investigates the issue of computer-aided daylight evaluation in an office room with a light shelf and dropped translucent ceiling. In this type of room, daylight is admitted from two sources: (i) a standard window in the wall and (ii) via a light shelf and clerestory window, which illuminate the plenum located above the working space. The light from the plenum is transmitted through the translucent ceiling into the office room. The present study is based on data obtained through a computer-aided daylight simulation by DeLuminæ (DL-Light, ver. 11.0.9, and DL-Instant, ver. 6.1.4) software using the Radiance engine and real weather data for Wroclaw, Poland, at 51st lat. N. An office room of 12 × 6 m with different shading and daylight distribution scenarios was simulated (Variants 1–5). Next, the useful daylight illuminance (UDI (%)) for the range of 300–3000 lx and daylight glare probability (DGP) were calculated. To further optimize the daylighting scenarios, an adaptive shading system was simulated, which was activated when the illuminance value dropped below 300 lx. In the final variant, Variant 6, mean UDI300–3000 values were recorded to be above 80% for 95% of the area of the work plane. This allows the conclusion that a light shelf and translucent ceiling guide daylight deep into the room, improving uniformity and reducing glare when the standard window is covered by an adaptive shading system.

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Optimization of useful daylight illuminance vs. drag force for vertical shading fins/panels

Cited by 7 publications

References 28 publications

An Evaluation of Annual Luminous Exposure from Daylight in a Museum Room with a Translucent Ceiling

An Evaluation of Annual Luminous Exposure from Daylight in a Museum Room with a Translucent Ceiling

Optimization of Useful Daylight Illuminance for Vertical Shading Fins Covered by Photovoltaic Panels for a Case Study of an Office Room in the City of Wroclaw, Poland

An Evaluation of Useful Daylight Illuminance in an Office Room with a Light Shelf and Translucent Ceiling at 51° N

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