An Intermodel Comparison of DDS and Daysim Daylight Coefficient Models

This paper presents the results of a Radiance-based intermodel comparison between the validatedDaysim daylight coefficient model and a new standard model for dynamic daylighting simulations (DDS).The new model offers independence from site location and orientation, estimation techniques andsimulation applications. The standard data can be used for dedicated daylighting analysis or for integratedbuilding energy/daylighting simulation. Results show that DDS outperforms Daysim, notably in caseswhere sensors are subjected to sudden changes in solar exposure, e.g. for sensors far from a window.