Useful daylight illuminances: A replacement for daylight factors

Nabil, Azza; Mardaljevic, John

doi:10.1016/j.enbuild.2006.03.013

Cited by 645 publications

(291 citation statements)

References 8 publications

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“…• Among illuminance indices, Useful Daylight Illuminance (UDI) seems to be suitable for long-term and concise evaluation, preserving a great deal of the significant information content of the illuminance time-series. It is two-tailed, so it is able to quantify both over-lit and under-lit conditions; it delivers information about useful levels of daylight, and the tendency for excessive levels of daylight that could be associated with glare and excessive solar gain [32]. However, (i) there is no full agreement on illuminance thresholds, (ii) UDI is based on spatial rendering and should be fulfilled in every point of the calculation grid.…”

Section: Discussionmentioning

confidence: 99%

“…For only six indices, five dealing with glare and one with the light quantity, their authors have explicitly stated that they are developed from field measurements carried out in offices [20,[32][33][34][35] or office-like test chambers [36].…”

Section: Building's Intended Usementioning

confidence: 99%

“…DA takes into account the real weather conditions at the site. However, according to Nabil Nabil and Mardaljevic [32], it has some limitations: (i) DA does not give significance to the daylight illuminance values that fall below the threshold, but which can be valued by occupants and may also reduce the electric lighting loads; (ii) being one-tailed, it makes no account of the amount by which the threshold is exceeded and whether this might be potentially a cause of visual discomfort due to an excess of light.…”

Section: Daylight Autonomymentioning

confidence: 99%

“…Mardaljevic [32], UDI informs not only on useful levels of daylight illuminance, but also on the frequency of occurrence of excessive levels of daylight that might cause occupant discomfort (i.e., glare) and unwanted solar gains. …”

Section: Useful Daylight Illuminancementioning

confidence: 99%

See 3 more Smart Citations

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Carlucci

Causone

Rosa

et al. 2015

Renewable and Sustainable Energy Reviews

337

156

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In the last decades, several studies aimed at assessing some specified aspects of visual comfort characterizing the relationship between the human needs and the light environment, such as an available amount of light, light uniformity, light quality in rendering colors, and predicting the risk of glare for space occupants. For each of them, a (still growing) number of indices and metrics have been proposed in literature and standards. In the present work, they are described, categorized according to common features, and finally discussed. As in the case of long-term thermal comfort indices, such visual comfort indices and their summation over a specified calculation period might be used for driving optimization processes to support a more conscious integrated design of buildings. To that purpose, the choice among the available visual comfort indices needs to be informed by an analysis of their features and implications. We present recommendations for use, and suggest areas where improvement is needed for their use in optimization processes to support buildings' design.

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Section: Discussionmentioning

confidence: 99%

Section: Building's Intended Usementioning

confidence: 99%

Section: Daylight Autonomymentioning

confidence: 99%

Section: Useful Daylight Illuminancementioning

confidence: 99%

See 2 more Smart Citations

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Carlucci

Causone

Rosa

et al. 2015

Renewable and Sustainable Energy Reviews

337

156

View full text Add to dashboard Cite

show abstract

“…Both must be considered together with their distribution on the horizontal plane of a space [31]. Useful illuminances range from 100 to 2000 lx, in order to provide variability in a room but at the same time avoid thermal discomfort [32].…”

Section: Energy and Visual Performance Evaluation Criteria A) Energy mentioning

confidence: 99%

Considerations on design optimization criteria for windows providing low energy consumption and high visual comfort

et al. 2012

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Correlations between building performances and design parameters of double‐skin facade utilizing perforated screen

Srisamranrungruang

Hiyama

2021

Japan Architectural Review

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This study investigates the effect of a perforated sheet combined with a doubleskin facade (DSPF) by varying the important building parameters, such as perforation percentage, facade orientation, and the thickness of the double-skin facade (DSF). This study determines the energy-saving, natural ventilation, and daylight performance of an office building in Tokyo, Japan by conducting simulations. This study discovers that the DSPF thickness does not influence the performances much and the DSPF thickness of 0.5 m is recommended. For daylighting, the system with the 40% perforation percentage on the south and 10% perforation percentage on the west is the best case of daylight access without disturbing glare in the particular view of this study. To balance natural ventilation and daylight when installing perforated screens, this research demonstrated the net heat removal in spring when the perforated percentage of 50% on the south and 30% on the west is recommended. In autumn, the net heat removal when the perforated percentage of 10% on the south and 30% on the west is recommended. This research demonstrated that the total net heat removal when the perforated percentage of 10% on the south and 30% on the west are recommended for removing heat throughout a year.

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Useful daylight illuminances: A replacement for daylight factors

Cited by 645 publications

References 8 publications

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design

Considerations on design optimization criteria for windows providing low energy consumption and high visual comfort

Correlations between building performances and design parameters of double‐skin facade utilizing perforated screen

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