This paper investigates two different daylight metrics, the commonly used daylight factor (DF) and the new IES approved climate based daylight modelling method (CBDM) IES LM-83-12 in comparison, with regards to their impact on the overall energy demand for heating, cooling and lighting as well as the optimum resulting window size. The assessment has been performed for a typical cellular office room in the climate of Athens, Greece. Different window to floor areas have been compared and the variations have been tested with and without an external overhang for North and South orientation and with an internal roller blind for the assessment of the Spatial Daylight Autonomy. The daylight factor (DF) assessment gives satisfactory results for almost all configurations. The IES LM-83-12 metric requires two criteria to be met, the Spatial Daylight Autonomy (sDA) and the Annual Sunlight Exposure (ASE). While the requirements for Spatial Daylight Autonomy are met for most configurations, the requirements for the Annual Sunlight Exposure are only met on the North façade.
History
Pagination
1097-1106
Location
Melbourne, Vic.
Start date
2015-12-02
End date
2015-12-04
ISBN-13
9780992383527
Language
eng
Publication classification
E Conference publication, E1 Full written paper - refereed
Copyright notice
2015, University of Melbourne
Editor/Contributor(s)
Crawford RH, Stephan A
Title of proceedings
ASA2015: Living and learning: research for a better built environment : Proceedings of the 49th International conference of the Architectural Science Association