Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics
In daylighting design, variation of building façade thickness (<i>f</i>) will result in variation of the daylight opening areas, which in turn will modify the values of daylight metrics within the space. However, studies dedicated to investigating the impact of varying <i>f</i&g...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/11/12/656 |
| _version_ | 1797506411984322560 |
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| author | Rizki A. Mangkuto Atthaillah Mochamad Donny Koerniawan Brian Yuliarto |
| author_facet | Rizki A. Mangkuto Atthaillah Mochamad Donny Koerniawan Brian Yuliarto |
| author_sort | Rizki A. Mangkuto |
| collection | DOAJ |
| description | In daylighting design, variation of building façade thickness (<i>f</i>) will result in variation of the daylight opening areas, which in turn will modify the values of daylight metrics within the space. However, studies dedicated to investigating the impact of varying <i>f</i> on indoor daylight metrics are relatively scarce. This study, therefore, aims to assess the theoretical impact of various façade thicknesses on various daylight metrics and lighting energy demands in a reference office space. Analytical calculations are performed using an outdoor diffuse illuminance profile of a tropical city. The building façade thickness values are varied within 0–0.50 m, at window-to-wall ratios (WWR) of 25%, 50%, and 75%. Based on sensitivity analysis, it is found that variation of <i>f</i> yields different impacts on the observed metrics, with sDA<sub>300/50%</sub> being the least influenced. Among all metrics in the central calculation point, DA<sub>300</sub>, UDI-a, and UDI-a′ yield relatively small coefficients of variation, and thus, have the lowest uncertainty with respect to <i>f</i>. Among all metrics for the entire room, sDA<sub>300/50%</sub> and sUDI-a<sub>50%</sub> have the lowest uncertainty, with interquartile ranges of no more than 0.4%. Overall, the contribution of this study is providing insight into the impact of façade thickness on various daylight metrics in indoor spaces, particularly in the worst-case scenario under the standard CIE overcast sky. |
| first_indexed | 2024-03-10T04:32:17Z |
| format | Article |
| id | doaj.art-f07aaf4dd0f84d67a8054f8974b848d1 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T04:32:17Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-f07aaf4dd0f84d67a8054f8974b848d12023-11-23T04:04:05ZengMDPI AGBuildings2075-53092021-12-01111265610.3390/buildings11120656Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the TropicsRizki A. Mangkuto0Atthaillah1Mochamad Donny Koerniawan2Brian Yuliarto3Building Physics Research Group, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesha 10, Labtek VI, Bandung 40132, IndonesiaEngineering Physics Doctorate Program, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesha 10, Labtek VI, Bandung 40132, IndonesiaBuilding Technology Research Group, School of Architecture, Planning, and Policy Development, Institut Teknologi Bandung, Jl. Ganesha 10, Labtek IXB, Bandung 40132, IndonesiaAdvanced Functional Material Research Group, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesha 10, Labtek VI, Bandung 40132, IndonesiaIn daylighting design, variation of building façade thickness (<i>f</i>) will result in variation of the daylight opening areas, which in turn will modify the values of daylight metrics within the space. However, studies dedicated to investigating the impact of varying <i>f</i> on indoor daylight metrics are relatively scarce. This study, therefore, aims to assess the theoretical impact of various façade thicknesses on various daylight metrics and lighting energy demands in a reference office space. Analytical calculations are performed using an outdoor diffuse illuminance profile of a tropical city. The building façade thickness values are varied within 0–0.50 m, at window-to-wall ratios (WWR) of 25%, 50%, and 75%. Based on sensitivity analysis, it is found that variation of <i>f</i> yields different impacts on the observed metrics, with sDA<sub>300/50%</sub> being the least influenced. Among all metrics in the central calculation point, DA<sub>300</sub>, UDI-a, and UDI-a′ yield relatively small coefficients of variation, and thus, have the lowest uncertainty with respect to <i>f</i>. Among all metrics for the entire room, sDA<sub>300/50%</sub> and sUDI-a<sub>50%</sub> have the lowest uncertainty, with interquartile ranges of no more than 0.4%. Overall, the contribution of this study is providing insight into the impact of façade thickness on various daylight metrics in indoor spaces, particularly in the worst-case scenario under the standard CIE overcast sky.https://www.mdpi.com/2075-5309/11/12/656daylightingfaçade thicknessovercast skydaylight metricslighting energy demand |
| spellingShingle | Rizki A. Mangkuto Atthaillah Mochamad Donny Koerniawan Brian Yuliarto Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics Buildings daylighting façade thickness overcast sky daylight metrics lighting energy demand |
| title | Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics |
| title_full | Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics |
| title_fullStr | Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics |
| title_full_unstemmed | Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics |
| title_short | Theoretical Impact of Building Façade Thickness on Daylight Metrics and Lighting Energy Demand in Buildings: A Case Study of the Tropics |
| title_sort | theoretical impact of building facade thickness on daylight metrics and lighting energy demand in buildings a case study of the tropics |
| topic | daylighting façade thickness overcast sky daylight metrics lighting energy demand |
| url | https://www.mdpi.com/2075-5309/11/12/656 |
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