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Daylight utilization in buildings : Analysis of existing conditions and development of improved rules and metrics

Bournas, Iason LU and Dubois, Marie-Claude LU (2018)
Abstract
This is the report of the work carried out for project "Dagsljusanvändning i byggnader" of the Swedish Energy Agency, project number 41816-1. This research provides background scientific information on the daylight performance of multi family apartment blocks located in Stockholm, and Örebro, Sweden. A sample of 54 buildings that consist of 10 888 individual rooms was evaluated using advanced daylight simulations. The studied buildings were selected based on their construction year and building typology in order to represent the existing building stock built in the previous century (1926 – 1991) as truthfully as possible. All simulations were performed including the existing surrounding urban context. Results show that specific building... (More)
This is the report of the work carried out for project "Dagsljusanvändning i byggnader" of the Swedish Energy Agency, project number 41816-1. This research provides background scientific information on the daylight performance of multi family apartment blocks located in Stockholm, and Örebro, Sweden. A sample of 54 buildings that consist of 10 888 individual rooms was evaluated using advanced daylight simulations. The studied buildings were selected based on their construction year and building typology in order to represent the existing building stock built in the previous century (1926 – 1991) as truthfully as possible. All simulations were performed including the existing surrounding urban context. Results show that specific building types consistently yield poor daylight conditions compared to other typologies. Furthermore, the study investigates the rate of complying rooms, apartments and buildings according to the current point Daylight Factor requirement (DFp) of the building code, and proposes new indicators that can be used instead. An average Daylight Factor (DFavg) requirement is proven to be misleading at building level, as rooms located on higher floors influence the average score for the building. At room level, it is shown that there is a high correlation between DFp and the median Daylight Factor (DFmedian) across a grid of points within the whole room area. The same compliance rates are also found by using a daylight requirement at apartment level, instead of room level. Results show that a median Daylight Factor requirement across an apartment area or which considers all but one room of the apartment yields the same percentage of successful outcomes as the current room-based compliance. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Book/Report
publication status
published
subject
keywords
Daylight regulation, Residential, Daylight, Compliance criteria
pages
23 pages
publisher
Swedish Energy Agency Project
language
English
LU publication?
yes
additional info
Swedish Energy Agency Project number 41816–1
id
9d5c840d-1793-438a-96dc-595c9b536cd6
alternative location
https://e2b2.se/library/4215/slutrapport_dagsljusanvandning_i_byggnader.pdf
date added to LUP
2019-05-20 15:10:03
date last changed
2019-06-04 09:10:56
@techreport{9d5c840d-1793-438a-96dc-595c9b536cd6,
  abstract     = {This is the report of the work carried out for project "Dagsljusanvändning i byggnader" of the Swedish Energy Agency, project number 41816-1. This research provides background scientific information on the daylight performance of multi family apartment blocks located in Stockholm, and Örebro, Sweden. A sample of 54 buildings that consist of 10 888 individual rooms was evaluated using advanced daylight simulations. The studied buildings were selected based on their construction year and building typology in order to represent the existing building stock built in the previous century (1926 – 1991) as truthfully as possible. All simulations were performed including the existing surrounding urban context. Results show that specific building types consistently yield poor daylight conditions compared to other typologies. Furthermore, the study investigates the rate of complying rooms, apartments and buildings according to the current point Daylight Factor requirement (DFp) of the building code, and proposes new indicators that can be used instead. An average Daylight Factor (DFavg) requirement is proven to be misleading at building level, as rooms located on higher floors influence the average score for the building. At room level, it is shown that there is a high correlation between DFp and the median Daylight Factor (DFmedian) across a grid of points within the whole room area. The same compliance rates are also found by using a daylight requirement at apartment level, instead of room level. Results show that a median Daylight Factor requirement across an apartment area or which considers all but one room of the apartment yields the same percentage of successful outcomes as the current room-based compliance.},
  author       = {Bournas, Iason and Dubois, Marie-Claude},
  institution  = {Swedish Energy Agency Project},
  language     = {eng},
  title        = {Daylight utilization in buildings : Analysis of existing conditions and development of improved rules and metrics},
  url          = {https://e2b2.se/library/4215/slutrapport_dagsljusanvandning_i_byggnader.pdf},
  year         = {2018},
}