The daylight factors report contains the pre-calculated hourly daylight factors for the four CIE sky types (clear, clear turbid, intermediate, and overcast sky), for each daylight reference points for each exterior window of a daylight zone. The file is CSV formatted – ready for spreadsheet viewing. The input for requesting the report is simple:
Output:DaylightFactors, SizingDays; !- Reporting Days
The following shows an excerpt the daylight factors for a window without shade:
This file contains daylight factors for all exterior windows of daylight zones. MonthAndDay,Zone Name,Window Name,Window State Hour,Reference Point,Daylight Factor for Clear Sky,Daylight Factor for Clear Turbid Sky,Daylight Factor for Intermediate Sky,Daylight Factor for Overcast Sky 01/21,ZN_1,ZN_1_WALL_NORTH_WINDOW,Base Window 1,ZN_1_DAYLREFPT1,0.00000,0.00000,0.00000,0.00000 1,ZN_1_DAYLREFPT2,0.00000,0.00000,0.00000,0.00000 1,ZN_1_DAYLREFPT3,0.00000,0.00000,0.00000,0.00000 [...] 9,ZN_1_DAYLREFPT1,2.14657E-002,1.73681E-002,1.38241E-002,1.41272E-002 9,ZN_1_DAYLREFPT2,2.14657E-002,1.73680E-002,1.38240E-002,1.41273E-002 9,ZN_1_DAYLREFPT3,2.14655E-002,1.73678E-002,1.38239E-002,1.41274E-002 [...] 24,ZN_1_DAYLREFPT1,0.00000,0.00000,0.00000,0.00000 24,ZN_1_DAYLREFPT2,0.00000,0.00000,0.00000,0.00000 24,ZN_1_DAYLREFPT3,0.00000,0.00000,0.00000,0.00000
The first line describes the data in the eplusout.dfs file.
The second line describes the header of the daily row:
|MonthAndDay||Zone Name||Window Name||Window State|
The Window State column has three possible outputs – “Base Window“ indicating windows without shades; a numeric value, from 0.0 to 180.0 for every 10.0 step, indicating the slat angle (in degrees) of the blind shading the window;”Blind or Slat Applied" indicating windows in shaded state by shades, screens, and blinds with fixed slat angle.
The lines after it describes the hourly daylight factors at each reference point:
|Hour||Reference Point||Daylight Factor for Clear Sky||Daylight Factor for Clear Turbid Sky||Daylight Factor for Intermediate Sky||Daylight Factor for Overcast Sky|