Implementing Vertical Greenery on Office Façade Opening to Improve Indoor Light Quality

Kristanto, Luciana; Ekasiwi, Sri Nastiti N.; Dinapradipta, Asri

doi:10.9744/dimensi.49.1.43-52

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…The evaluation of light and thermal aspect as well as the occupant's perception is expected to provide insights to architects and building owners when making decisions for future applications. The effectiveness of perforated metal in regulating lighting is influenced by the size of the hole diameter and spacing, which is closely related to the sun's position [6]. Based on the results, a comparison was carried out between two types of the device with the same openness factor but different dimensions and spacing.…”

Section: Introductionmentioning

confidence: 99%

“…The first sample with a smaller hole and spacing reduced lighting by 39% to 15%, while the second sample with the double dimension had a lower transmission coefficient reduction result of 40% to 32%. [6] Artificial shading devices can be substituted with biotic variants using plant as a natural solar tracker. VGS can be used to prevent radiation naturally and serve as a biotic sun tracker aesthetically [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

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Shading Performance of Plant and Perforated Metal in The Thermal, Light, and Building-occupant Perception

Kristanto,

Canadarma,

Oentoro

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Visual and thermal comfort are essential aspects influencing the activity of building occupant. For buildings with glass facades, the integration of shading devices becomes essential to enhance user comfort. This study aims to compare the effects of artificial (perforated metal) and biotic shading (Vernonia elliptica plant) on the thermal and visual parameters as well as perception of respondents regarding both devices. The study was carried out using a 1m x 1m x 1m box model. Perforated metal had a diameter of 3 cm and a spacing of 2 cm with a 29% openness factor, while the Vernonia elliptica had 2 levels of density, namely LAI 1 and LAI 2. The results showed that there was no significant difference in the average air temperature and RH produced by shading of vegetation LAI 1, LAI 2, and perforated metal. However, the use of vegetation reduced the illuminance significantly compared to the other device. The average DF of perforated metal ranged from 15.4 to 25%, while a range of 1.9-4.1% was obtained for LAI 1 and LAI 2. These results were inconsistent with building occupant’s perception that the vegetation had a better effect on the thermal aspect than the visual aspect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shading Performance of Plant and Perforated Metal in The Thermal, Light, and Building-occupant Perception

Kristanto,

Canadarma,

Oentoro

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Accordingly, it was found that vegetation serves as an effective shadow factor that can be compared to various artificial barriers [19,20]. While the thermal parameters, heat transfer, and energy balance of vertical greenery have already been studied and formulated by various investigators [21][22][23] there is still a need to explore the specific mechanism through which plants filter the abundant incoming light on glass facades [24]. This study focuses on leaf area index (LAI) as a quantitative variable to investigate its performance in shading sunlight.…”

Section: Introductionmentioning

confidence: 99%

Assessing light performance of vertical greenery shading in tropical climate

Kristanto,

Ekasiwi,

Dinapradipta

2024

Environ. Res. Commun.

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In tropical climate, natural light is abundant and advantageous for incorporating daylighting into building designs. However, this daylight intensity often leads to excessive brightness indoors, specifically in high-rise buildings with glass façades. In addressing sustainability concerns, incorporating greenery outside glass façades can serve as effective sun-shading, and alleviate eyestrain for building occupants. Therefore, this study aimed to investigate the effectiveness of plant leaves in reducing the high light intensity on glass facades. To achieve this, an experiment was conducted using the Vernonia elliptica plant, a plant known to thrive in medium to high sunlight in tropical climates. Three different leaf area indexes (LAI) were examined in this study as the independent variables, while light illuminance and luminance served as the dependent variables. To experiment, two identical box models measuring 1m x1m x 1m were utilized. The two models were orientated towards the West and North, representing intense and longer light exposure. The first, which is the base case, featured a glass façade without any other additional element, whereas the other incorporated greenery on its glass façade. The obtained results indicated that the impact of leaf density on illuminance and luminance is significant, specifically when the LAI was doubled. It was also found that denser foliage with longer strands of leaves produced better results, specifically at low altitudes. These results can be used for the implementation of vertical greenery shading in real high-rise office buildings.

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Reducing Glare on Building Facade by Implementing Vertical Greenery Shading – user-sensation vs luminance-measurement

Kristanto,

Nastiti Nugrahani Ekasiwi,

Dinapradipta

2024

E3S Web Conf.

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The user of high-rise office building usually feel discomfort glare because of high luminance from glass facade. This experimental research has an objective to find out how vertical greenery can reduce the sensation of glare. Using here a cubicle that represent one person workstation in 2m x 4m x 3.45m dimension with opening from clear glass, WWR 50%. The base case was the condition without vegetation compared to condition with Vernonia elliptica plant LAI 0.75 and LAI 1.5 which implemented as shading. The result found that vegetation LAI 1.5 can reduce luminance 54.3-56.1% compared to without vegetation. The sensation of glare from Uncomfortable becomes Perceptible (for direct light); from Perceptible-Acceptable becomes Imperceptible-Perceptible (for diffuse light). Vegetation LAI 0.75, for direct light, can reduce luminance 35.3-53.6% compared to condition without vegetation. The glare sensation vote becomes Acceptable. Whilst for diffuse light, although the luminance measurement was increase because of the reflected glare from surroundings, the natural aesthetic and green colour of leaves was relaxing, so that the sensation of glare still at the same vote, between Perceptible-Acceptable compared to without vegetation. This result proof that for biotic shading, besides the quantitative, the qualitative variables play the role.

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Implementing Vertical Greenery on Office Façade Opening to Improve Indoor Light Quality

Cited by 3 publications

References 20 publications

Shading Performance of Plant and Perforated Metal in The Thermal, Light, and Building-occupant Perception

Shading Performance of Plant and Perforated Metal in The Thermal, Light, and Building-occupant Perception

Assessing light performance of vertical greenery shading in tropical climate

Reducing Glare on Building Facade by Implementing Vertical Greenery Shading – user-sensation vs luminance-measurement

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