Simple mathematical models to link climate-based daylight metrics with daylight factor metrics and daylighting design implications

Li, Shuyang; Li, Danny H.W.; Chen, Wenqiang; Lou, Siwei; Tsang, Ernest K.W.

doi:10.1016/j.heliyon.2023.e15786

Cited by 8 publications

(4 citation statements)

References 46 publications

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Section: Analysis Of Resultsmentioning

confidence: 99%

“…In well-daylit spaces where the available daylight exceeds the required level, daylighting can lead to significant energy savings when combined with appropriate daylight-linked lighting controls. DA and cDA can be used to predict energy savings resulting from standard daylight-linked switching and dimming lighting controls, respectively [41]. The mDA with 2000 and 3000 lux illuminance thresholds was simulated under the measured outdoor illuminance, the 15 CIESSs and the three RSs were analyzed, and the correlations are displayed in Figure 5.…”

Section: Analysis Of Resultsmentioning

confidence: 99%

“…The RMSEs are less than 9.4% under the three RSs indicating that the CBDMs could be well-predicted under RSs at the initial stage, which is particularly useful for places without long-term measured outdoor illuminance data. To allow for global application and more help during the early design stage, the room parameters, particularly the obstruction angle, shading device, glazing area, and visual transmittance, are modified to obtain a wide range of point daylight factors (PDFs) and average daylight factors (ADFs) under traditional overcast sky conditions (i.e., Sky 1) [41]; and the 15 CIESSs weather files at a given location throughout the whole year should be generated. These daylight factor matrices (DMFs) are strongly related to a fraction of the visible sky and room parameters [44].…”

Section: 𝑀𝐵𝐸mentioning

confidence: 99%

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Determination of Climate-Based Daylight Metrics under 15 CIE (International Commission on Illumination) Standard Skies and Three Representative Skies

Li,

Chen

et al. 2023

Buildings

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Daylighting serves as a crucial sustainable strategy in assessing the built environment. Climate-based daylight metrics (CBDMs) have been widely employed to evaluate the dynamic performance of daylight. However, conventional CBDM calculations heavily rely on time-consuming full-scale computer simulations. In addition, the CBDMs need representative annual daylight data that are essential for CBDM analysis, and can pose challenges in many locations. Even when suitable daylight data are available, they may not accurately reflect current trends and conditions. This study aims to determine the various CBDMs using both the 15 CIE Standard Skies and the three representative skies specific to Hong Kong. All data were simulated from a software named RADIANCE (version 5.3). The R2s of the CBDMs under both the 15 CIE Standard Skies and the three representative skies were more than 0.89, and the MBEs and RMSEs were not more than 5.4% and 9.1%, respectively, when the outdoor illuminance measured in 2004 was employed. The findings could be adopted for other locations where the required daylight parameters were not systematically recorded.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Section: Analysis Of Resultsmentioning

confidence: 99%

Section: 𝑀𝐵𝐸mentioning

confidence: 99%

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Determination of Climate-Based Daylight Metrics under 15 CIE (International Commission on Illumination) Standard Skies and Three Representative Skies

Li,

Chen

et al. 2023

Buildings

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“…Having assessed the daylighting performance of an office building retrofitted with an atrium structure, the authors [5] found that the average UDI of the building was at the upper limit of 2000 lux. However, the choice of UDI upper limit has varied among researchers over the years, with Li et al [6] alluding that daylighting above 2000 lux may result in overheating and glare. Brembilla et al [7] used 3000 lux as the UDI upper limit but obtained the fewest instances with vertical illuminance in this range.…”

Section: Introductionmentioning

confidence: 99%

Daylighting Assessment of a Heritage Place of Instruction and Office Building in Alice, South Africa

Overen,

Meyer,

Makaka

2023

Buildings

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Mitigation of post-occupancy building energy consumption has resulted in the change of building design to utilise ambient weather factors for indoor thermal conditioning and lighting. This has increased the construction of new buildings with large glazing façades and reduced adaptive use of heritage buildings as they are considered not designed to meet modern energy use requirements. This paper evaluates the daylighting performance of a heritage place of instruction and office building. A quantitative research approach based on building information simulation tools was adopted. Autodesk Revit 2021 and Integrated Environmental Solutions Virtual Environment (IESVE) 2021 were used in modelling and simulating the building daylighting performances. The building’s annual daylight performance analysed with climate-based daylight modelling shows that points in the analysed spaces were within the UDI300-2000 for more than 50% of the occupied period (07h00 to 17h00) in a year. The sDA300,50% was found to be 100% in most spaces, which is considered a favourable daylit space according to the Illuminance Engineering Society of North America (IESNA). Further, discomfort glare analysis revealed that the building daylight glare is imperceptible, with an average daylight glare probability of 21.2%. The 1:14 window–wall ratio contributes to the building daylighting relative to orientation without constituting visual discomfort. Overall, climate-based daylight modelling revealed that the building’s annual daylight level meets the IESNA requirements with an imperceptible daylight glare.

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Recommended control options of a daylight dimming system for daylit perimeter zones of open-planned office with curtain walls

Byun,

Yoon,

Kim

2024

Energy Reports

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Simple mathematical models to link climate-based daylight metrics with daylight factor metrics and daylighting design implications

Cited by 8 publications

References 46 publications

Determination of Climate-Based Daylight Metrics under 15 CIE (International Commission on Illumination) Standard Skies and Three Representative Skies

Determination of Climate-Based Daylight Metrics under 15 CIE (International Commission on Illumination) Standard Skies and Three Representative Skies

Daylighting Assessment of a Heritage Place of Instruction and Office Building in Alice, South Africa

Recommended control options of a daylight dimming system for daylit perimeter zones of open-planned office with curtain walls

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