[Radiance-general] .epw to Daylight Matrix

Greg Ward gregoryjward at gmail.com
Wed Jun 5 09:24:30 PDT 2013


Hi Germán,

This is a nice idea, and certainly convenient if you're starting from an EPW file (which I understand is common).  There are translators from EPW to WEA, and it's our intention to release one of these as part of the standard package this summer.

We do have this issue of multiple versions of the Perez sky simulation running around, and keeping those consistent and bug-free.  Jan Wienold's group refit Jean-Jacques Delaunay's original gendaylit code with Wendelin Sprenger, updating it and fixing numerous bugs in a major code cleanup.  In ignorance of these developments, I took Ian Ashdown's implementation of the Perez sky model and created gendaymtx.  Ideally, these two programs would be based on a common library that implements the Perez sky.  Now, we have two different implementations we've had to compare to make sure the results are the same.  I expect there are some corner cases where limits are tested a little differently, producing different outputs.

I don't think either LBNL or ISE have time to unify these two programs at the moment.

Cheers,
-Greg

> From: Germán Molina Larrain <gmolina1 at uc.cl>
> Date: June 5, 2013 9:06:18 AM PDT
> 
> Dear all, 
> 
> I have made a version of the gendaymtx program that uses an EnergyPlus file (called epw2daymtx). It has all the other options available in gendaymtx, but I added some new:
> 
> - It allows interpolation for subhourly analysis.
> - Allows overwriting the latitude-longitude-timezone from the weather file.
> 
> In case someone wants to try it and check for bugs and that kind of stuff, let me know! I compared a few cases, and it worked well.
> 
> THANKS
> 
> German
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