EnergyPlus Measure to import BSDF-idf from LBNL WINDOW

asked 2018-07-26 09:36:09 -0600

Tobias
181 ●5

updated 2018-07-26 15:25:43 -0600

MatthewSteen

10147 ●19 ●26 https://www.nrel.gov/b...

Hi guys

I'm trying to create a EnergyPlus measure to import the BSDF-idf input from LBNL WINDOW. Most of the functionality needed can be found in the BCL measure "inject_idf_ojbects". However the measure chages the formatting of all the matrix data (to something that cannot run) - example:

image description

(correct formatting on the left before applying the measure - wrong formatting on the right after application of the measure)

I think it comes down to that one of these functions

source_idf = OpenStudio::IdfFile::load(OpenStudio::Path.new(source_idf_path)).get workspace.addObjects(source_idf.objects)

uses "," to destinguise a new line and not "\n" as it should in this case.

Does anybody have an idea of how to correctly import the BSDF-idf using a EnergyPlus measure?

Cheers Tobias

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answered 2018-07-26 10:13:46 -0600

ericringold

10637 ●32 ●8 https://www.nrel.gov/b...

updated 2018-07-27 08:46:18 -0600

When you say it's "something that cannot run" do you mean EnergyPlus crashes before running, without exhibiting any error message?

I don't think the formatting of the Matrix:TwoDimension is the cause of the problem; EnergyPlus should always think a comma separates object input values, if they are on separate lines or not.

The problem I had when using the 'inject idf objects' measure with BSDF data was it created a Construction:ComplexFenestrationState object with extra empty fields at the end, which due to a bug in EnergyPlus causes a crash (see this issue). In the image below, the object on the right was from the idf created by OpenStudio after running the 'inject_idf_objects' measure, and after opening the in.idf in IDFEditor and saving-as, the trailing objects were removed (object on the left), and the file ran:

image description

Unfortunately, ~~if the BSDF construction only has two glass layers and one gas layer,~~ the workspace.addObjects method will always add those extra empty fields. Until the EnergyPlus bug is fixed, the only way to get a file to run is to manually edit the idf created by OpenStudio (in.idf in the /run folder, either with a text editor or by opening and saving in IDFEditor) to delete those lines (and adding the semicolon to the last input line) and running with EPLaunch.

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The formatting of both of the options looks superficially OK to me, so I concur with Eric that if there's a problem, it's probably not the formatting. The form on the right is in the example file "CmplxGlz_Daylighting_SouthVB45deg.idf" (only thing I see different is the name) and it runs OK for me.

Jason DeGraw ( 2018-07-26 11:25:31 -0600 )edit

Thank you

Yes I should have been more elaborate on "something that cannot run": No error message, but empty output file. And simulation time was way too short.

However I can confirm your conclussion - it is the 3 extra lines in "Construction:ComplexFenestrationState" that causes the problem. I have been using a BSDF with 3 glazing layers which also add the extra lines (so not only 2 layered glazing).

Cheers