eplusout.dfs[LINK]

The daylight factors report contains the pre-calculated hourly daylight factors for the four CIE sky types (clear, clear turbid, intermediate, and overcast sky) and two 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:

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.

If only one reference point the last 4 columns in the data will be zero.

MonthAndDay,Zone Name,Window Name,Window State

Hour,Daylight Factor for Clear Sky at Reference point 1,Daylight Factor for Clear Turbid Sky at Reference point 1,Daylight Factor for Intermediate Sky at Reference point 1,Daylight Factor for Overcast Sky at Reference point 1,Daylight Factor for Clear Sky at Reference point 2,Daylight Factor for Clear Turbid Sky at Reference point 2,Daylight Factor for Intermediate Sky at Reference point 2,Daylight Factor for Overcast Sky at Reference point 2

01/21,PERIMETER\_BOT\_ZN\_1,PERIMETER\_BOT\_ZN\_1\_WALL\_SOUTH\_WINDOW,Base Window

1,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

2,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

3,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

4,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

5,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

6,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

7,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

8,5.08810E-002,5.78633E-002,2.59271E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

9,5.85018E-002,6.68126E-002,3.02054E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

10,6.26710E-002,7.12830E-002,3.37475E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

11,6.35876E-002,7.17181E-002,3.59982E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

12,6.23746E-002,6.98139E-002,3.66365E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

13,6.39669E-002,7.21972E-002,3.61684E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

14,6.25455E-002,7.10272E-002,3.39911E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

15,5.85994E-002,6.67866E-002,3.05581E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

16,5.17581E-002,5.89493E-002,2.63461E-002,1.42712E-002,0.00000,0.00000,0.00000,0.00000

17,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

18,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

19,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

20,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

21,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

22,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

23,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

24,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000,0.00000

The first line describes the data in the eplusout.dfs file. The second line describes the header of the daily row:

Month and Day	Zone Name	Window Name	Window State
01/21	PERIMETER_BOT_ZN_1	PERIMETER_BOT_ZN_1_WALL_SOUTH_WINDOW	Base Window

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; blink indicating windows in shaded state by shades, screens, and blinds with fixed slat angle.

The third line describes the hourly daylight factors. Note that the last 4 columns are 0.0 because there is only one daylight reference point.:

Hour	Daylight factor for clear sky at reference point 1	Daylight factor for clear turbid sky at reference point 1	Daylight factor for intermediate sky at reference point 1	Daylight factor for overcast sky at reference point 1	Daylight factor for clear sky at reference point 2	Daylight factor for clear turbid sky at reference point 2	Daylight factor for intermediate sky at reference point 2	Daylight factor for overcast sky at reference point 2
10	0.06239	0.07088	0.03377	0.01427	0.0	0.0	0.0	0.0