Daysim discussion forum Google Group

Re: [daysim forum] BSDFs

2013-01-15T03:37:53Z

THat is affirmative, Christoph! Not sure what the schedule os for that release, though.

RE: [daysim forum] BSDFs

2013-01-15T02:00:35Z

Dear Ramana,

As of now the three phase method is not in DAYSIM. My understanding is that there is an ongoing commitment from Penn State to implement it though with support from the Energy Efficiency HUB.

Best,

Christoph

Sent: Monday, January 14, 2013 4:42 PM
To: daysim@googlegroups.com

BSDFs

2013-01-14T21:41:33Z

All,

Does anyone know if BSDFs can be modeled using the latest version of
Daysim? If yes, is there any guidance?

Thanks,
Ramana.

Re: [daysim forum] Re: false color grid - daysim results in SketchUp

2012-10-23T18:46:23Z

So it turns out, the issue is with SketchUp version 8, both the google and
trimble versions. It draws the the scale/legend, displays node values, etc
fine but not the actual colored grid.

I installed SketchUp 7 and everything seems to be working find in 7. The
su2ds manual says SketchUp version 7 or higher, but seems like it is not

Re: [daysim forum] Re: false color grid - daysim results in SketchUp

2012-10-23T18:06:42Z

Thanks for the quick response Christoph. The two models I'm having issues
with, have 338 and 228 sensors each, spaced at 3'x3'.

Hopefully I'll find a resolution soon, will keep you all posted.

Ramana.

Re: [daysim forum] Re: false color grid - daysim results in SketchUp

2012-10-23T17:52:12Z

Dear Ramana,

I am personally not using sketch up so I am the wrong person to answer this. A number of people have indicated that they are running into issues when a grid has more than 5000 sensors even though I have not been able to reproduce this.

Best,

Christoph

Sent from my iPad

Forgot to add, could this be caused by a sensor grid that is too dense? is there a density threshold above which the false color grid results cannot be rendered? Thanks.

Re: false color grid - daysim results in SketchUp

2012-10-23T13:58:33Z

Forgot to add, could this be caused by a sensor grid that is too dense? is
there a density threshold above which the false color grid results cannot
be rendered? Thanks.

false color grid - daysim results in SketchUp

2012-10-23T13:25:59Z

Dear All,

I just got a new computer and I'm trying to import daysim results back into
SketchUp using the plugin su2ds. This does create a new layer called
results, shows the scale with average but does not display the false
colored grid for daylight autonomy or any other metric. Is this a known

Daysim 3.1e does not run

2012-10-16T18:44:11Z

Hello all,
I'm having troublerunning Daysim. I'm using 64-bit Windows 7 Professional.
I installed JAVA with the 3.1e Setup, and yet, when I start Daysim, there
is a command prompt popup which runs and nothing happens after it closes.
Any idea why this may be happening? Has anyone else had a similar problem?

Daylight Autonomy Bencemarks

2012-10-04T11:05:17Z

Dear All

I am looking for papers/research for DA thresholds related to good indoor environmental quality that can be referenced in our South African version of LEED and was wondering if anyone might be able to point me in the right direction?

The Green Building Council of South Africa is considering using Daylight Autonomy as an indicator for their Daylight Credit for the Greenstar SA Public and Education Building Tool – our version of LEED. They currently use DF. The credit falls under the Indoor and Environmental Quality section and so is about the positive impact of daylight on the occupants rather than energy savings. They have a separate glare related credit and so this does not have to be considered within this credit.

RE: [daysim forum] ecotect to daysim viewpoint file

2012-05-29T13:00:35Z

Dear Bayanda,

If I recall right Ecotect saves Radiance viewpoint description in the *.rif file whereas they should be stored in an independent *.vf file for gne_dgp_profile. The viewpoint data formats in both file types are nearly identical but requires a few manual edits. Please refer to the Radiance rpiece man page for details.

ecotect to daysim viewpoint file

2012-05-28T10:51:07Z

Hello,
I have got a question regarding using Ecotect in combination with Daysim for annual DGP calculation.
I am using the Ecotect Radiance/Daysim exporter.
In Ecotect, I've created multiple views, by placing cameras in the model.
Using the wizard, it is possible to select these cameras. However when I export this to daysim, the DGP view file is missing.

Re: [daysim forum] Using different RGB conversion values in rtrace

2012-04-22T10:03:05Z

Hello Christoph,

I will keep you informed, however I am just getting started so I might take
a while…

I will still have to look into the material part. I was thinking about the
following approach (is there something terribly wrong with it?):

Since the current materials and illuminance calculations are based on

Re: [daysim forum] Using different RGB conversion values in rtrace

2012-04-22T09:45:58Z

Dear David,
thank you for your information!
I do have some questions, can I contact you by e-mail?
Kind regards,
Dolf
Op vrijdag 20 april 2012 17:27:59 UTC+2 schreef David Geisler-Moroder het
volgende:

Re: [daysim forum] Daylight indicators calculation

2012-04-22T04:53:13Z

Hi Thibault,

You can see the code DAYSIM uses to predict user behavior and electric
lighting (c:\DAYSIM\src\ds_el_lighting\ ), though it might not be
enjoyable. There is also a useful paper on the methods,
[link].
Calculating DF from the dc file would indeed be difficult. You could

Re: [daysim forum] Using different RGB conversion values in rtrace

2012-04-20T15:34:18Z

I am interested in your work as well, Dolf!
Rob Guglielmetti
NREL Commercial Buildings
robert.guglielme...@nrel.gov

Re: [daysim forum] Using different RGB conversion values in rtrace

2012-04-20T15:27:59Z

Dear Dolf,
I did some work on this topic 2 years ago - see
[link]
Using an RGB renderer can lead to significant inaccuracies when compared to
a full spectral simulation.
Best,
David
Am 20. April 2012 16:00 schrieb Dolf Bakker <dolfbak...@gmail.com>:

RE: [daysim forum] The DAYSIM GUI has deleted some files that were potentially corrupted

2012-04-20T15:29:08Z

Thanks Christoph,
Best Anne
Den 20/04/2012 03.37 skrev "Christoph Reinhart" <ti...@mit.edu>:
were potentially corrupted
than the ill file etc. If that is the case, just open the *ill fir and
"file safe as" it.
Of Anne Iversen
potentially corrupted
this particular case we get an error when running the analysis:

RE: [daysim forum] Using different RGB conversion values in rtrace

2012-04-20T15:24:42Z

Very nice Dolf. We have discussed this approach in the past and I think that it is promising. What I would do is just run multiple Daysim calculations with material properties set to one specific wavelength at a time. Getting those is the hard part. I am interested in learning more about your project. Feel free to share once you have more information at creinh...@mit.edu.

Re: [daysim forum] Using different RGB conversion values in rtrace

2012-04-20T14:00:26Z

Dear Christoph,

Thank you for your response.
The idea behind changing the RGB weighting, is to obtain the non-visual
(Non-image forming (in this case: circadian)) illuminance, instead of the
visual illuminance.

I will look into the source code.

Kind regards,

Dolf
Op woensdag 18 april 2012 03:48:56 UTC+2 schreef Christoph Reinhart het

RE: [daysim forum] The DAYSIM GUI has deleted some files that were potentially corrupted

2012-04-17T20:27:35Z

-----Original Message-----
Sent: Tuesday, April 17, 2012 4:24 PM
To: 'daysim@googlegroups.com'
Hi Anne,
Usually this has something to do with for example the dc file being newer than the ill file etc. If that is the case, just open the *ill fir and "file safe as" it.
Christoph
-----Original Message-----

RE: [daysim forum] calculate 0 direct daylight coefficient for variant static_system

2012-04-18T01:52:48Z

The '0' means that Daysim assumes that you have no direct daylight coefficients. I have not seen that error but probably your input files are corrupt.
A description of the trans/transdata material can be found in [link].
Christoph
-----Original Message-----

RE: [daysim forum] Using different RGB conversion values in rtrace

2012-04-18T01:48:56Z

Dear Dolf,
Radiance uses 0.3 0.59 and 0.11 to weigh the RGB values. These numbers roughly correspond to the luminous response curve of the human eye.
Daysim operates with a great scene, i.e. all materials are converted from color into grey using the weighing functions above before gen_dc is used to calculate the daylight coefficients. If you want to modify these parameters in your colored scene, you could change the relevant code in radfiles2daysim.exe. The source code can be found under C:\Daysim\src\radfiles2daysim.

Re: [daysim forum] Daylight indicators calculation

2012-04-18T05:56:10Z

Hi Alstan,
Thank you for your response.
The reason for recalculating the metrics is that I cannot understand exactly what Daysim do at the second step of the calculation. I cannot access to the code to understand really precisely what are the algorithms of user behaviours, calculation of electric consumption of lighting devices, etc.

RE: [daysim forum] Daylight indicators calculation

2012-04-18T01:43:39Z

Dear Thibault,
Daysim calculates the Daylight Factor calculation with the *dc daylight coefficient file combined with a CIE overcast sky. The *ill file cannot be used for this purpose.
I am not using Su2ds. Maybe someone else can chime in?
Christoph
-----Original Message-----
Sent: Friday, April 13, 2012 1:16 PM

RE: [daysim forum] Electric Lighting Use calculation

2012-04-18T01:50:26Z

We have greatly expanded and improved the Daysim electric lighting calculation. You can access the latest binaries via DIVA 2.0.0 which can be found under [link]. I will also be building a new proper Daysim installer soon.
Christoph
-----Original Message-----
Sent: Thursday, April 12, 2012 12:24 PM

Re: [daysim forum] Daylight indicators calculation

2012-04-18T02:34:17Z

I believe DAYSIM uses the .dc files to calculate daylight factor based on
a CIE Overcast sky rather than the Perez skies used for the annual
illuminance calculation. The negative person in me says that DF is not a
very good metric to compare buildings, so if you're re-calculating metrics
from the .ill files, maybe not much is lost. You could just use DAYSIM's

Re: [daysim forum] Electric Lighting Use calculation

2012-04-18T02:29:55Z

Hi Verdiana,
The 'automatic control system' is, as far as I know, a dimming system that
occupants may turn completely on or off depending on the chosen behavior
model. The 'automatic control with occupancy on/off' will not be effected
by occupant behavior.
Perhaps my above comment helps some, but I am afraid that I cannot offer

calculate 0 direct daylight coefficient for variant static_system

2012-04-11T20:37:05Z

Hi,

I have two questions.

First, when rtrace is running, it says 'calculate 0 direct daylight
coefficient for variant static_system'. What does that mean?

Second, after the rtrace finishes running, there is no output in the
res/.ill file. The size of .ill file is 0. What could be wrong? I

Daylight indicators calculation

2012-04-13T17:16:25Z

Hi everyone,
This mail about the calculation of the daylight indicators calculated
by Daysim.
I am actually trying to write a script which could take the .ill file
as an entry and calculate all the indicators (DA, DAMax, DF, etc).
The aim is to bring the script several .ill files from several
projects in order to directly compare the daylighting performances of

The DAYSIM GUI has deleted some files that were potentially corrupted

2012-04-13T08:59:40Z

Hi,
We have used DAYSIM for a lot of projects with success - however, for
this particular case we get an error when running the analysis:
"A error occured:
The Daysim GUI has deleted some files that were potentially corrupted.
Please Start Daylighting Analysis once again."

Both .dc and .ill files are generated, and they seem to be okay.

An error occured

2012-04-10T09:01:16Z

Dear users,

Exporting a model from SU to Daysim and hence initiating a simulation
and analysis resulted in an error, cf. [link]
Has anyone seen this error before and does anyone know what the
problem could be?

Best regards

Per Haugaard

Electric Lighting Use calculation

2012-04-12T16:24:09Z

Hi,

I have two doubts about the method of calculations of the electric
lighting use with DaySim (I am using the 3.1 beta version):

I simulated a zone of 90m2 with office destination, and I studied the
lighting conditions in 4 sensors (at 3m, 5m, 7m, 9m of distance from
the window). The control is with photosensor dimming control and all

Using different RGB conversion values in rtrace

2012-04-15T20:36:23Z

Hello,
I have a question concerning rtrace in Daysim:
Is it possible to use other RGB-weighting/conversion values?
In Radiance:
rtrace -I [other options] model.oct < input.dat > output.dat
illuminance = 47.4*R_irrad + 120*G_irrad + 11.6*B_irrad
I would like to use different values for the 47.7, 120 & 11.6. Would this

Re: [daysim forum] Daysim, Radiance and Ecotect

2012-04-02T17:04:47Z

Hi Bayanda,
The -sj flag is no longer included in the newer versions of Radiance.
Unfortunately, instead of being backwards compatible, it causes a fatal
error. I believe you can remove the -sj flag from within the Radiance
Control Panel from Ecotect. Perhaps others with Ecotect installed can

Daysim, Radiance and Ecotect

2012-04-02T16:26:28Z

I have installed the DIVA for Rhino plugin and since there I can no
longer run radiance grid analysis directly from Ecotect. I am getting
the following error message in the dos window:

"rtrace: fatal - command line error at '-sj'

Which then results in no data being written to the grid file.

Re: [daysim forum] Daysim generic blinc model

2012-03-17T20:11:10Z

Hi Eloise,
The simple model is exactly as you say. DAYSIM just takes the raytrace
information from an unshaded calculation, but cuts out the direct
component and reduces the diffuse to 25% of the unshaded raytrace
calculation. By necessity, you can't really define it better than that.
If you want to get really specific and rigorously define the properties of

Daysim generic blinc model

2012-03-16T10:37:28Z

Dear all,

I am planning to perform some simulations using the Daysim' simple
dynamic shading device model.
In the tutorial, it is only written that DAYSIM simply assumes that a
generic blind system blocks all direct sunlight and transmits 25% of
all diffuse daylight. But I could not find anywhere any additional

Daysim luminous efficacy model

2012-03-07T11:21:51Z

Hi All,

maybe someone can help me shed some light on this.

I am trying to use daysim to calculate annual irradiation (not
illuminance) on a surface. As the *.wea file essentially reads the
direct normal solar radiation and the diffuse horizontal solar
radiation column of the epw files I would assume that there should be

Re: [daysim forum] Batch Evalglare calculations

2012-01-11T22:03:26Z

see the documentation for the forfiles command here:
[link]

Evalglare VS. Findglare and Glarendx

2012-01-10T06:56:55Z

Hi everyone,
I'm so confused with Glare calculations and I was hoping if anyone can tell
me the differences between using evalglare and Radiance commands findglare
and glarendx ? what kind of results will I get if use them?
Thanks
Rania Labib

Batch Evalglare calculations

2012-01-08T06:44:46Z

I have a set of 180 images rendered in Radiance and I would like to
use Evalglare command in DOS to calculate DGP for all of these
images , any way I can do them in one single command ( batch
calculations) ?
It would be easier to do them in daysim but unfortunately Daysim can't
handle LCP and Prismatic Panel materials that I've used in radiance to

Working through bugs

2012-01-05T23:47:48Z

Hello,

Should daysim be able to work on both 32bit and 64bit machines?

We are having issues with what seems to be an incorrect installation
on our computers at work, there are a mix of 32 and 64bit machines,
and I actually don't think this is the problem, but while
investigating other issues I heard somewhere that it didn't work on

Evalglare Questions.

2012-01-06T15:56:05Z

Hi everyone ,I just found this tutorial to calculate GDI using evalglare
[link]
in the page before the last page, to calculate glare on a specific spot it
says that I should enter the x, y, and opening value in radians.
what is the opening value?

Re: [daysim forum] Re: wea file specification

2011-12-15T16:03:09Z

Hi mpat,
The .wea file format is pretty simple compared to the EnergyPlus Weather
format, thankfully!
It starts with some header lines, like so:
And is followed by 8760 space-separated lines looking like these,
Which contain,
There should be some examples in C:\DAYSIM\wea\.
Best,
Alstan
On Thu, 15 Dec 2011 10:41:02 -0500, mpat <mpatriar...@kilowattsol.com>

Re: wea file specification

2011-12-15T15:41:02Z

Thank you for the answer,
but the point is that I need to import data from a CIE-IDMP station,
so I have to build the file myself.
do you know which fields of a EPW file are needed for daysim ?
regards

Re: RE: [daysim forum] Where to find Occupancy Schedules (.occ)

2011-11-25T14:50:16Z

hi,
I tried to define an occupancy profile, the time step is 5 min. But it seems something wrong. Could you give me some help for that?
Thanks!

Luo Tao

To: daysim@googlegroups.com
A description of the *.csv files can be found here [link] You can generate the files simply in Excel.

Re: orientation sktechup

2011-11-21T16:23:24Z

No plugin. Just export a .3ds.
Mary

Re: [daysim forum] Re: orientation sktechup

2011-11-17T14:24:01Z

What plugin are you using to export geometry to Daysim? How is it working
out for you?
Ramana.

Re: orientation sktechup

2011-11-17T13:21:17Z

I´ve found the answer... No, it´s not imported from sketchup.
Define it on scene rotation angle.

Thanks!