This report examines how daylight provision through a climate-based daylight model (CBDM) simulation can be rapidly and accurately determined in the Danish building industry in the early design. Moreover, how to make uniformity in the way of calculating annual daylight in the Danish construction industry.
To accomplish this goal, an investigation of industry’s needs, literature of useful information regard climate-based daylight modelling (CBDM) and a comprehensive review of daylight design tools for annual daylight evaluation were found through state-of-the-art literature re-view. Here 45 tools are compared to 5 different categories developed based on various as-pects involved in a daylight design tool.
The findings are that no program is available for making rapidly and accurately determined in the Danish building industry in the early design. Different combinations from programs will suit the various complexities, objects involved and design phases. For compliance check in the Danish building regulation recommendation goes to following combination of programs; Accelerad, Daysim, Diva4Rhino and these program are verified in this report based on SBi daylight calculation in practices and thereafter an annual daylight evaluation of 3 typical room were tested to see if they fulfil the Danish building regulation requirement and 2 out of 3 fulfilled the 300lux-rule.
A program combination based on the tendency are suitable for climate-based daylight modelling in early design in a Danish context: The GPU for Parallelism and Accelerad as compu-tation for Radiance as calculation engine with photo mapping bi-directional capabilities. Suit-able for 2-phase to 6-phases CBDM techniques and has a graphic user interface like Velux daylight visualiser. Plugin with honeybee+ capability and Diva4Rhino interface and graphical algorithm editor in Dynamo that work as a direct plugin to Revit.
Another key finding is that no benchmark of which state-of-the-art CBDM techniques used for annual daylight evaluation and the different techniques show a deviation up to 39% from the benchmark CBDM techniques in calculation ASE. The direct and diffuse illuminance metrics show to be more robust results of ±15% within the benchmark. Furthermore, the report shows when to use CBDM techniques in terms of simplification, accuracy and parameter included in the daylight simulation and it illustrates a study of which CBDM techniques the different programmers use. Based on the test of the three typical room and literature work out a guide of how to make CBDM evaluation.
To conclude no simple solution was found to solve the CBDM simulation in early design in the Danish building construction industry given none of the programs fulfil the need to rapidly and accurately determined. The most promising available program a combination of: Accelerad, Radiance, Daysim and Diva4Rhino and then wait for the future development of new better programs.