NCEUB Conferences, 13th International Radiance Workshop 2014

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Is current modelling practice fit-for-purpose for daylight evaluation using CBDM metrics?
Eleonora Brembilla, John Mardaljevic, Francesco Anselmo

Building: Arup 8 Fitzroy St.
Room: Emmerson & Shears Room
Date: 2014-09-03 02:30 PM – 03:00 PM
Last modified: 2014-08-24


Climate-Based Daylight Modelling (CBDM) can be defined as a prediction method relating the annual climate data for a specific locale to the luminous (and radiant) dynamic quantities that characterise daylight provision in a built environment. Currently though, there are almost as many distinctive procedures as the number of daylight experts using them.


Since its introduction in 1998, CBDM has gained rising popularity among evaluation practices and in 2013 it was included for the first time as a mandatory requirement in a UK school baseline design guide. More specifically, the Education Funding Agency (EFA) decided to insert the Useful Daylight Illuminance (UDI) and Daylight Autonomy (DA) calculations in the building designs assessment of the Priority School Building Programme (PSBP).


Questions remain however on the impact that different input models and parameters can have on the resulting metrics. The presented PhD research focuses on these issues related to the simulation process run by various programs and will compare them with other validated procedures and with real case studies of classrooms spaces.