Verification of simple illuminance based measures for indication of discomfort glare from windows

Line Røseth Karlsen, Per Kvols Heiselberg, Ida Bryn, Hicham Johra

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

18 Citationer (Scopus)

Resumé

Modern office buildings are often designed with highly glazed facades, with an intention of being sufficiently daylit. However, extensive daylight supply has its backside, as glare might be a considerable concern. From a building design perspective it is important to be able to make reasonable predictions of discomfort glare from windows already in the early design stage when decisions regarding the façade are taken. This study focus on verifying if simple illuminance based measures like vertical illuminance at eye level or horizontal illuminance at the desk are correlated with the perceived glare reported by 44 test subjects in a repeated measure design occupant survey and if the reported glare corresponds with the predictions from the simple Daylight Glare Probability (DGPs) model. Large individual variations were seen in the occupants’ assessment of glare in the present study. Yet, the results confirm that there is a statistically significant correlation between both vertical eye illuminance and horizontal illuminance at the desk and the occupants’ perception of glare in a perimeter zone office environment, which is promising evidence towards utilizing such simple measures for indication of discomfort glare in early building design. Further, the observed response indicate that the participants in the present study were more tolerant to low illuminance levels and more sensitive to high illuminance levels than the DGPs model would predict. More and larger studies are needed to confirm or enfeeble this latter finding.
OriginalsprogEngelsk
TidsskriftBuilding and Environment
Vol/bind92
Udgave nummerOctober
Sider (fra-til)615–626
Antal sider12
ISSN0360-1323
DOI
StatusUdgivet - 2015

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Glare
architectural design
indication
test subject
survey design
individual variation
prediction
building
supply
evidence
office
Facades
Office buildings
decision
test

Emneord

  • Discomfort glare
  • Daylight
  • Illuminance
  • Visual comfort

Citer dette

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Verification of simple illuminance based measures for indication of discomfort glare from windows. / Karlsen, Line Røseth; Heiselberg, Per Kvols; Bryn, Ida; Johra, Hicham.

I: Building and Environment, Bind 92, Nr. October, 2015, s. 615–626.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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AB - Modern office buildings are often designed with highly glazed facades, with an intention of being sufficiently daylit. However, extensive daylight supply has its backside, as glare might be a considerable concern. From a building design perspective it is important to be able to make reasonable predictions of discomfort glare from windows already in the early design stage when decisions regarding the façade are taken. This study focus on verifying if simple illuminance based measures like vertical illuminance at eye level or horizontal illuminance at the desk are correlated with the perceived glare reported by 44 test subjects in a repeated measure design occupant survey and if the reported glare corresponds with the predictions from the simple Daylight Glare Probability (DGPs) model. Large individual variations were seen in the occupants’ assessment of glare in the present study. Yet, the results confirm that there is a statistically significant correlation between both vertical eye illuminance and horizontal illuminance at the desk and the occupants’ perception of glare in a perimeter zone office environment, which is promising evidence towards utilizing such simple measures for indication of discomfort glare in early building design. Further, the observed response indicate that the participants in the present study were more tolerant to low illuminance levels and more sensitive to high illuminance levels than the DGPs model would predict. More and larger studies are needed to confirm or enfeeble this latter finding.

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