I tried to run a comparison for an annual analysis between the DirSunHours from LB, from HB and the ASE. The results was interesting.
To ensure that the three analyses were as consistent as possible, I used the same location, the standard time, add a 0.5 to the HOY to have the same half-hour intervals like the .wea, edit the .wea file with the add of the ClearSky comp. to eliminate cloudy hours for the Radiance Analysis, excluded the windows and created a schedule that takes into account all 8760 hours.
The Direct Sun Hours results between LB and HB are fairly consistent, the difference seen here is probably due to the number of sky patches Radiance uses.
The most inconsistent result is between the Direct Sun Hours calculated with Radiance and the ASE. Although the total number of SunUpHours are the same, the ASE result shows that less direct sunlight enters the room from the North fassade.
I used the enhanced 2-Phase raytracing for greater accuracy, -ab0 to exclude diffuse rays and set the ASE threshold to 0 Lux to filtering out even the weakest sun rays. The ASE schedule is also set to include all hours of the year, not just office hours.
The difference is about 80 to 90 fewer hours on the sensors adjacent to the apertures.
The AnnualDaylight is simulated with rfluxmtx, high Radiance Parmater, and -ab 0.
What could be causing this discrepancy?
Thanks and best regards