Daysim 3.1+ PS Tool

Hello Dr Rick Mistrick

Following up on the below conversation, for what I can perceive at this
point, by installing not the current version (4.0) but Daysim 3.1 with the
PS tool I’ll be able to import the file from Ecotect (Daysim 4.0 apparently
doesn’t allow the integration with Ecotect due to the lack of compatibility
with the GUI) and develop the SDA analysis for LEED V4 according to LM-83(
space by space for the moment)?!

Best regards,

Miguel Corujo


Skype: sea.miguelcorujo

Av.Infante Santo, 69 a-c | 1350-177 Lisboa - Portugal | T: +351 213 939
340/9 +351 217 120 510 | F: +351 217 120 511



        If the glare has to be calculated by the ASE 1000-250 with no

passive shading devices, won't that force us to design spaces that

effectively have no glare that needs to be controlled by the user. Of

course I can use the dynamic shading model options in daysim to limit the

glare as well, whether it is option 1 standard blinds or option 2 the

dynamic model.

        With that in mind will the work flow work?

The problem with your approach is that it does not accurately address the

shading devices, which need to close completely across a window group to

prevent direct sunlight from striking more than 2% of the work plane

analysis points. Shading devices must be applied to obtain sDA according to

LM-83. Penn State currently have a new module for DAYIMps that can do this,

but it requires a slightly different header file format that is not 100%

compatible with the GUI.

To correctly calculate sDA with a manual approach like you are trying, you

can determine the direct sunlight values by running the model with the

shades up and -ab set to 0. The points without sunlight will have values of

zero. At any hours when the more than 2% of the points from this "-ab 0"

run reach 1000 lux, you apply the data from a full shade run, otherwise you

use the data from an unshaded window. We are currently finalizing a new

interface to address this and other advanced calculations, but it is

primarily designed to analyze a single space rather than an entire building.

We are also working on a solution for an entire building, but that is

perhaps 9 or so months from completion.

Rick Mistrick

Associate Professor

Penn State University


From: James F Geers [mailto:jgeers at

Sent: Thursday, May 15, 2014 11:10 AM

To: radiance-daysim at

Subject: [Radiance-daysim] Using Daysim to demonstrate compliance with


I am trying to demonstrate compliance with LM-83-12 using the Daysim GUI 3.1

and would like a vetting of the following methodology.

To demonstrate sDA I ran the program on Scene Complexity 2 and ran the

analysis with 300 lux as my DA threshold for a 10 hour day. Then checking

the Daylight Autonomy I calculated the percentage of the space that had more

than 300 lux 50% of the time to get my number of sDA300-50.

To demonstrate the ASE 1000-250 I ran the same model ( no blinds) with 0

ambient bounces (ab-0) and ran the analysis 1000 lux as my DA threshold for

a 10 hour day. If the standard year is 365 days x 10 hours =3650 hours, 250

hours would be would be a DA1000 of 6.85% for no more than 10% of the

sensor points would demonstrate compliance.

Until an updated script or Daysim GUI can calculate these values directly,

I think this methodology should work. I am pursuing this path to utilize

free of Daysim in conjunction with Sketchup.

Please let me know if I am missing anything.