top of page

“Prediction of discomfort glare from windows under tropical skies” accepted for publication

Writer's picture: IEN ConsultantsIEN Consultants

IEN has had the following manuscript accepted for publication in the Journal of Building and Environment, "Prediction of discomfort glare from windows under tropical skies"


Journal: Building and Environment

Special Issue: Advances in daylighting and visual comfort research.

Publication Date: 15 February 2017

DOI: http://dx.doi.org/10.1016/j.buildenv.2016.08.005


Abstract: Discomfort glare is common problem in modern buildings that employ highly-glazed façades. Glare not only has negative impacts on occupant comfort but can also increase energy use in buildings. Yet a robust discomfort glare metric, particularly with regards to daylight, has proven elusive. The Unified Glare Probability (UGP), developed using 493 surveys under clear skies in Brisbane, Australia, shows promise as useful tool for estimating glare from windows. This investigation attempts to validate the UGP using a similarly large number of surveys under different sky conditions, different building types and demographics in the tropical climate of Kuala Lumpur, Malaysia.


The study uses a similar methodology to the initial investigation of the UGP, using a combination of luminance mapping with a post-occupancy evaluation (POE) questionnaire on discomfort glare. A total of 341 surveys were collected from six buildings; three green-rated and three regular office buildings. Hypothesis testing of the luminance data collected in these buildings indicate that the ratio of window to background luminances are a more sensitive measure of occupant discomfort than ratios of window to task luminances.


The results for the UGP show agreement in predicting discomfort from windows between both data sets using regression analysis. A simple hypothesis test showed discomfort was accurately predicted by the old UGP model for 69% of new surveys. The agreement between the two data sets for window glare enabled them to be combined into one massive data set of 813 surveys to update the UGP. The updated metric uses a logistic curve in place of the original linear transformation of the Unified Glare Rating (UGR) to prevent illogical values of probability being obtained from the metric.


Note to users: To cite this article: Hirning, M., Isoardi, G., Garcia-Hansen, V. (2017) Prediction of discomfort glare from windows under tropical skies. Building and Environment 113:107 – 120, Special Issue: Advances in daylighting and visual comfort research.


Link to manuscript, DOI: click.

コメント


CONTACT

IEN Consultants Sdn. Bhd. (HQ)

Syed Kechik Building, 8th floor

Jalan Kapas, Bangsar

59100 Kuala Lumpur

Malaysia

Phone: +6 03 2095 1233

Mail: malaysia@ien-consultants.com

IEN Consultants (Singapore) Pte. Ltd.

600 North Bridge Road
#11-07, Parkview Square
Singapore 188778

Phone: +65 9271 0067
Mail: singapore@ien-consultants.com

  • LinkedIn
  • YouTube

SUBSCRIBE NOW to receive our latest news and insights directly to your inbox

Thanks for submitting!

bottom of page