First time here? Check out the Help page!
2020-03-10 06:03:23 -0500 | received badge | ● Popular Question (source) |
2018-05-10 17:37:56 -0500 | commented answer | Radiance scattering through ground glass Using the -I leads to reasonable results, at least for detection planes deep inside the room (4m + distance from the gg |
2018-05-10 17:37:56 -0500 | received badge | ● Commentator |
2018-05-10 17:29:46 -0500 | marked best answer | Radiance scattering through ground glass Hi! I am doing some tests with Radiance and have some difficulties using light scattered on a sort of ground glass. The setup I am using is quite simple. a ground glass typed plane (gg plane) and another parallel plane in some distance. The gg plane is serving as a virtual light source and I want to verify intensity reduction per area, with the second plane in different distances. The base setup is as follows:
There seems to be no widening in the scattered intensity when the receiving plane is placed e.g. in 2 m and 8 m distance. The light seems to propagate collimated. I would have expected sort of Lambertian scattering from the gg plane, resulting in a reduced intensity / area with increasing distance. For the gg plane I tried a number of different parameters, e.g.: void trans e18f205e-4986-4e35-b872-1c0d4d99db44-00031dca 0 0 7 0.48913 0.48913 0.48913 0.08 0 0.5333 0 For the radiance command I also tried a variety of parameters, e.g.: rtrace -aa 0.15 -ab 4 -ad 256 -ar 32 -as 20 -st 1 -lw 0.05 -dc 0 -dj 0.7 -dp 32 -dr 0 -ds 0 Any help is appreciated! In case it is helpful, I can provide rad, octree, sky and all other files used to run the radiance simulation. Cheers Chris [EDIT]: I have uploaded two images here showing more or less the situation. The smaller speckled plane is the ground glass. The larger white plane has a fixed position relative to the ground glass and finally the purple plane is the 'measurement plane'. The 'purple' plane is in false color, showing the intensity distribution. What is remarkable, the intensity distribution does not seem to change with the distance. I hope the images make it a little bit clearer. Of course, this sort of completely artificial test, but I derived it from a more realistic scenario, where the gg plane was used to illuminate a deep room, by boiling things down to the bare minimum.
|
2018-05-10 17:29:46 -0500 | received badge | ● Scholar (source) |
2018-05-06 14:06:49 -0500 | commented answer | Radiance scattering through ground glass I have uploaded two more files with a black box around the points and the points in different distance http://evelisedi |
2018-05-06 14:06:34 -0500 | commented answer | Radiance scattering through ground glass I have uploaded two more files with a black box around the points and the points in different distance http://evelisedid |
2018-05-06 14:05:46 -0500 | commented answer | Radiance scattering through ground glass Actually I started out with a black box around the plane and found out, that did not change the behavior at all, thus re |
2018-05-04 19:09:47 -0500 | commented answer | Radiance scattering through ground glass Ok, no problem I made a zip file http://evelisedidone.com/0/cloud/index.php/s/QggTWDgkIq6xUab hope this one works, othe |
2018-05-04 07:28:40 -0500 | commented answer | Radiance scattering through ground glass Right, I don't use an ambient file and setting aa=0 does not seem to affect the results. I have packed the files I use f |
2018-05-01 14:00:54 -0500 | commented answer | Radiance scattering through ground glass As the intesity did not decrease with distance I tried this simplified setup, with a smaller gg plane and a quite large |
2018-05-01 13:58:45 -0500 | commented answer | Radiance scattering through ground glass Hi! Thanks a lot for your reply! I tried the rtrace parameters, but unfortunately it does not change the result (using a |
2018-04-30 14:20:21 -0500 | commented answer | Radiance scattering through ground glass Sure, moved it to the original question, as this certainly is not an answer ;-) File upload seems impossible here, have |
2018-04-30 14:17:02 -0500 | edited question | Radiance scattering through ground glass Radiance scattering through ground glass Hi! I am doing some tests with Radiance and have some difficulties using light |
2018-04-30 14:17:02 -0500 | received badge | ● Editor (source) |
2018-04-30 13:03:59 -0500 | answered a question | Radiance scattering through ground glass I have uploaded two images here showing more or less the situation. The smaller speckled plane is the ground glass. The |
2018-04-29 18:41:01 -0500 | asked a question | Radiance scattering through ground glass Radiance scattering through ground glass Hi! I am doing some tests with Radiance and have some difficulties using light |
2016-10-20 11:17:13 -0500 | received badge | ● Student (source) |
2016-10-19 19:13:56 -0500 | asked a question | Energy Plus, calculate zone energy balance manually Hi! I have some doubt about how to calculate a zone's energy balance manually, using EnergyPlus output variables. Using a most simple model with only walls and no window, light, equipment, people, infiltration and a simple ac this works quite well (i.e. balance is close to zero), summing up these variables:
Using a slightly more complicated model including a window I simply added the according variable for the window:
but the balance (i.e. sum) is far from being zero. Is there any point I am missing? Best regards Chris EDIT EDIT EDIT Hi! Thanks a lot everyone for the quick and wonderful replies. Here some more information about what I was doing as I didn't write it above. The difference for the case I am looking gets up to 90 W / h for an about 35 m² room. What I was actually looking at is the annual sum of these values and expected it to be zero. As far as I understand the EP manual the inside conduction should get quite close to what is actually transferred by a wall. At least in a case with more zones and an interior wall between them the both values of the two zones match quite closely. The according convective variables should give the heat transferred from the wall to the air, right? The reason for the question is an analysis where I want to check through which surface most heat enter the zone and I fully agree that there could (should??) be a simple solution for this from the side of EP, which we have been discussing here as well. Cheers Chris EDIT EDIT EDIT |
2015-08-18 21:12:28 -0500 | commented question | Energy plus addons (Legacy OpenStudio SketchUp Plug-in and OpenStudio Application Suite) do not work. Hi! Thanks for the reply but actually the problem is / was really the accent in the folder name. So as a workaround I copied the files from c:\users\usário\AppData\Sketchup\Sketchup 2015\Sketchup\Plugins... to c:\ programData\Sketchup\Sketchup 2015\Sketchup\Plugins... Maybe someone can fix the ruby script for a future version?!? It could also be nice to have a dialog asking where the plugin should be installed (or more explicit for the current user only or for all users), installing the plugin already in the programData folder. Best regards Chris |
2015-08-18 00:46:31 -0500 | commented question | Energy plus addons (Legacy OpenStudio SketchUp Plug-in and OpenStudio Application Suite) do not work. Hi! Are there any results concerning this problem? I guess I encounter a similar problem on a machine here (32 Bit Win7, E+ 8.3, Sketchup 2015 make ... but portuguese installation, i.e. plugin folder resides in c:\Usários\Usário\AppData\Roaming\Sketchup\Sketchup2015\plugins...) Is there an alternative search path for plugins in Sketchup 2015? Regards Chris |