.epw to Daylight Matrix

radiance-general
1

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

2

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 <[email protected]>
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

3

Greg,

Actually what I did was to combine gendaymtx and Daysim's epw2wea. This was
an intermediate step for another program I am working in. Also, another
intermediate step was the compilation the Daysim's wpe2wea on Mac (in case
you want it)... although I am not quite sure if there are isues considering
the source of the data (Solar or Local time, energy savings, and that kind
of things).

It is good to know in advance that this might change, let me know which one
you choose... I am going to keep working on what I am doing, since I need
to proove some stuff for my MSc, haha.

Regards,

German

PS: My code also has a ot of repeated functions that exist on other files
(gendaymtx, in this case)... I would like to learn how to clean it soon.

···

2013/6/5 Greg Ward <[email protected]>

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 <[email protected]>

*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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