[Radiance-general] Discrepancy between the simulated DF and calculated DF in Desktop RADIANCE 2.0.

[Byoungsoo Ahn]

Dear All,

I am using Desktop RADIANCE 2.0 with AutoCAD R14.

For the DF, I got different values from the simulated (from the 
simulation manager) and calculated DF (from the illuminance ratio of 
indoor/outdoor sensor). I don¡¯t know which one is correct DF. I 
also measured with scale model to compare the DF with DR simulation. 
DF in scale model is very close to the simulated DF (from the 
simulation manager option). Calculated DF from indoor/outdoor 
illuminance is higher than simulated DF.


By checking the batch files in project folder, I noticed the 
difference between the simulated DF and calculated DF is come from 
the outdoor illuminance level. But I could not figure out why I got 
different numbers. 

As shown below, all the numbers are same in batch files.
In the FL_0110.bat file, 26100 looks like outdoor illuminance (see 
the FL_0110.bat file). 
However, outdoor illuminance at that time is 14648.064 lx (see the 
Out_0110_I_out.out file).

Outdoor illuminance level in DF simulation is higher than 
illuminance simulation for outdoor sensor. I think the difference of 
DF is come from the difference of outdoor illuminance level. But I 
still can not understand which one is correct. 


*I run all the simulation at the same conditions. All runs are at 
1:10 pm (CST) in College Station. And all the other parameters are 
also same.




--------------------------------------------------------

Batch Files in Project Folder


Run for DF calculation (FL_0110.bat)

del FL_0110_DF_floor.out
rad -v 0 FL_0110.rif
type Grid_floor.pts | rtrace @FL_0110.opt -faa -h -opv -I -dv- -x 1 
FL_01101.oct | rcalc -e '$1=$1;$2=$2;$3=$3;$4=
($4*47.4482686+$5*119.950519+$6*11.6012125)/26100.000000' >> 
FL_0110_DF_floor.out
@cls


Run for Indoor Illuminance (FL_Illum_0110.bat)

del FL_Illum_0110_I_floor.out
rad -v 0 FL_Illum_0110.rif
type Grid_floor.pts | rtrace @FL_Illum_0110.opt -faa -h -opv -I -dv-
-x 1 FL_Illum_01101.oct | rcalc -
e '$1=$1;$2=$2;$3=$3;$4=$4*47.4482686+$5*119.950519+$6*11.6012125' 
>> FL_Illum_0110_I_floor.out
@cls


Run for Illuminance of Outdoor Sensor (Out_0110.bat)

del Out_0110_I_out.out
rad -v 0 Out_0110.rif
type Point_out.pts | rtrace @Out_0110.opt -faa -h -opv -I -dv- -x 1 
Out_01101.oct | rcalc -
e '$1=$1;$2=$2;$3=$3;$4=$4*47.4482686+$5*119.950519+$6*11.6012125' 
>> Out_0110_I_out.out
@cls


-------------------------------------------------------------

Out Files in Project Folder

Run for DF calculation (FL_0110_DF_floor.out)

3750      4800      275.0001      0.00196749261
7500      4800      275.0001      0.00202036887
11250      4800      275.0001      0.00186442329
3750      3300      275.0001      0.0020485585       Floor_1
7500      3300      275.0001      0.00214985753      Floor_2
11250      3300      275.0001      0.00199673954      Floor_3
3750      1800      275.0001      0.00195969207
7500      1800      275.0001      0.00215063028
11250      1800      275.0001      0.00186199776


Run for Indoor Illuminance (FL_Illum_0110_I_floor.out)

3750      4800      275.0001      52.3787953
7500      4800      275.0001      58.7716727
11250      4800      275.0001      50.8646398
3750      3300      275.0001      53.6415735         Floor_1
7500      3300      275.0001      55.2004445         Floor_2
11250      3300      275.0001      54.263763          Floor_3
3750      1800      275.0001      53.1193063
7500      1800      275.0001      55.2840016
11250      1800      275.0001      52.6013467


Run for Illuminance of Outdoor Sensor (Out_0110_I_out.out)

14250      2900      14120      14648.064

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Thank you in advance.

Regards,
Byoungsoo Ahn.
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