Useful daylight illuminance: a new paradigm for assessing daylight in buildings

Nabil, Azza; Mardaljevic, John

doi:10.1191/1365782805li128oa

Cited by 484 publications

(269 citation statements)

References 11 publications

(14 reference statements)

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“…Refinements to the method included the introduction of a manual blind control model to yield more accurate predictions of the annual daylight availability in a building 24 . Since this survey has been carried out, several other dynamic daylight performance metrics have been introduced 25 . The advantage of dynamic metrics over the static daylight factor is that they take local climate, facade orientation, and occupancy patterns into account.…”

Section: Simulation Outputmentioning

confidence: 99%

Findings from a survey on the current use of daylight simulations in building design

Reinhart

Fitz

2006

Energy and Buildings

169

104

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.enbuild. 2006.03.012 Energy and Buildings, 38, 7, pp. 824-835, 2006-07-01 Findings from a survey on the current use of daylight simulations in building design Reinhart, C. F.; Fitz, A. The majority of respondents worked in Canada (20%), the United States (20%), and Germany (12%). Most participants were recruited through building simulation mailing lists. Their self-reported professions ranged from energy consultants and engineers (38%) to architects and lighting designers (31%) as well as researchers (23%). They worked predominantly on large and small offices and schools.91% of respondents included daylighting aspects in their building design. Those who did not consider daylighting blamed lack of information and unwillingness of clients to pay for this extra service. Among those participants who were considering daylighting 79% used computer simulations. This strong sample bias towards computer simulations reflects that many participants had been recruited through building simulation mailing lists. Participants named tools' complexity and insufficient program documentation as weaknesses of existing programs. Self-training was the most common training method for daylight simulation tools. Tool usage was significantly higher during design development than during schematic design. Most survey participants used daylighting software for parameter studies and presented the results to their clients as a basis for design decisions.While daylight factor and interior illuminances were the most commonly calculated simulation outputs, shading type and control were the most common design aspects influenced by a daylighting analysis. The use of scale model measurements had rapidly fallen compared to a 1994 survey, whereas trust in the reliability of daylighting tools has risen. While participants named a total of 42 different daylight simulation programs that they routinely used, over 50% of program selections were for tools that use the RADIANCE simulation engine, revealing the program's predominance within the daylight simulation community.

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Section: Simulation Outputmentioning

confidence: 99%

Findings from a survey on the current use of daylight simulations in building design

Reinhart

Fitz

2006

Energy and Buildings

169

104

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“…The discrepancy indicates the possibility of IES-VE not registering the adjacent buildings blocking the daylight which needs to be further investigated. The measured DF is found to be constantly higher than what radiance simulated, this may be due to the unrealistic CIE Overcast Sky which does not represent the actual dynamic sky condition as argued by many reviews [6,16,18,21,23] …”

Section: Radiance and Daylight Factormentioning

confidence: 89%

“…It also shows that with 200mm difference in blind height causes a significant increase in illuminance, at least for the first 2 meters. The recorded illuminance data was also formatted to display Useful Daylight Illuminance (UDI) stacked bar chart for easier reference [18] (Figures 8 and 9).…”

Section: Results -Df Illuminance and Energy Savingsmentioning

confidence: 99%

“…In accordance to the Malaysia Standards MS1525:2014 and the Green Building Index NonResidential New Construction tool (NRNC), the lighting illumination requirement for office space is 300-400 lux or 1-3.5% DF [17,19]. These standards apply only for artificial lights as various reviews have affirmed that subjects accept daylight illuminance ranging 200-2000 lux [4,18,21]. This corresponds well to the DF of 0.5-3.5% instead of 1-3.5%, as an external illuminance under overcast sky ranges 30k lux to 50k lux [7].…”

Section: Daylight Performancementioning

confidence: 99%

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Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Gene-Harn

Reimann²,

Bhaskaran³

et al. 2016

MATEC Web Conf.

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Abstract. The field of office daylighting is vital for both energy efficiency practice and occupants' visual comfort. With the emergence of green building in Malaysia, building designers are exploring avenues for energy efficiency design; one common strategy is daylighting. The majority literature reviews on daylighting are skewed towards temperate or developed countries, where sky luminous condition is different from that of the Tropics. Conventional daylighting system designs redirect daylight from the envelope or atrium openings, such as light shelves. Presumed to be the pioneer daylight trough in the Tropics, this paper presents the simulated and in-situ lighting level measurements prior to occupancy. This case study presents an as-built daylight trough design which is able to daylight the office space as deep as 6 meters sufficiently. It achieves a lighting power density 1.90W/m 2 and saves 39.2% of lighting energy over conventional office lighting energy. Discussed further is the practicality of working with such a system, including cost implication, return on investment and contractual challenges in reaching a consensus on the design. The results reinforce that the effectiveness of daylighting design is very dependable on the sun path and obstacles surrounding the office tower. The RADIANCE simulation correlates well to field measurement results. Further investigation into the light trough, its lighting energy savings, users' interaction, visual comfort, and glare is still ongoing.

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“…Early examples such as the daylight factor and/or minimum work plane illuminances under select clear sky conditions can be calculated during design but also directly measured in real spaces if outside sky conditions resemble the relevant reference skies. More recently, building standards and green building rating systems have moved towards climate-based daylighting metrics (CBDM) examples being daylight autonomy [Reinhart and Walkenhorst 2001], which is promoted through the Illuminating Engineering Society of North America's (IESNA) Lighting Measurement #83 (LM-83) [2012] and useful daylight illuminance [Nabil & Mardaljevic 2005]. CBDM consider illuminance distributions under all sky conditions appearing in a space during "regularly occupied hours".…”

Section: Introductionmentioning

confidence: 99%

Predicting the Daylit Area—A Comparison of Students Assessments and Simulations at Eleven Schools of Architecture

Reinhart

Rakha

Weissman

2014

LEUKOS

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In recent years climate-based metrics, in particular daylight autonomy, have found their way into North American standards and green building rating systems. The authors showed in an earlier pilot study that subjective space evaluations by architecture students correlated well with daylight-autonomy-based daylit area simulations in a single north-facing studio space in Boston. For this manuscript the authors collaborated with educators at 11 schools of architecture and applied the method consistently to 13 spaces within the participating schools. The schools are located in Brazil (2), Canada (1), Egypt (1) and the United States (7). The authors also introduce the concept of a "partially daylight area" metric based on a minimum illuminance threshold for daylight autonomy of 150lux. The two metrics correctly determined in 18 out of 24 cases which parts of the study space are fully or partially daylit. The authors accordingly propose a two-tier evaluation system to rate the daylight availability in spaces.

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Useful daylight illuminance: a new paradigm for assessing daylight in buildings

Cited by 484 publications

References 11 publications

Findings from a survey on the current use of daylight simulations in building design

Findings from a survey on the current use of daylight simulations in building design

Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Predicting the Daylit Area—A Comparison of Students Assessments and Simulations at Eleven Schools of Architecture

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