Hi,
I am using rtrace to calculate the total solar radiation in a new
development in Dubai. The Radiance version is NREL version 5.0.a.3.
I am struggling because the results of rtrace do not have the diffuse
component. Points in shade have 0 W/m2 total radiation.
I generate the sky with
gendaylit 6 22 10 -W 667.0 255.0 -g 0.0 -O 1 -a 25.25 -o -55.333 -m -55 -i
60 > sky_2010062210.rad
The resulting sky is
···
-----------------------------------------------------------------------------------------------------------------------------
# /usr/local/radiance/bin/gendaylit 6 22 10 -W 667.0 255.0 -g 0.0 -O 1 -a
25.25 -o -55.333 -m -55 -i 60
# Local solar time: 10.00
# Solar altitude and azimuth: 62.6 -92.7
void light solar
0
0
3 9.814e+06 9.814e+06 9.814e+06
solar source sun
0
0
4 0.459672 0.021278 0.887834 0.533000
void brightfunc skyfunc
2 skybright perezlum.cal
0
10 5.775e+01 0.000e+00 -0.826576 -0.452548 12.755413 -3.521895 0.140043
0.459672 0.021278 0.887834
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The geometry is quite simple: one vertical building and a circular area of
interest at 1.5 m from the ground
(
https://dl.dropboxusercontent.com/u/1342856/Screen%20Shot%202015-06-25%20at%2016.14.39.png
)
The radiance scene also includes the ground. The circular are you see in
the picture is not exported to radiance.
This is the rtrace command I use is
rtrace -h -I -ab 2 -aa 0.15 -ar 128 -ad 512 -as 256 -ds 0.15 -dt 0.05 -w
-oov octree_2010062210.oct < mesh.pts > irradiation_2010062210.dat
The typical line in mesh.pts is something like
26.334568151370174 -2.649873307914385 1.4999999999999996 0.0 0.0 1.0
Using these commands all the points in shade appear not to have any diffuse
radiation. See image
https://dl.dropboxusercontent.com/u/1342856/Screen%20Shot%202015-06-25%20at%2016.19.16.png
I am sure I am making a fundamental mistake, but really can't understand
where the problem is.
Thanks
Ruggiero