How to export OSM to IDF with the command line?

asked 2021-01-14 05:54:22 -0500

Adrien
404 ●4 ●8

updated 2021-01-14 10:06:19 -0500

I can export my OpenStudio model with the OpenStudioApplication: File / Export / IDF. But I would like to do this from the command line (without running the simulation), is it possible? I can't find it on https://nrel.github.io/OpenStudio-use... or when typing openstudio.exe --help or openstudio list_commands.

Oh, I could edit the OSM file to introduce something that would make the simulation instantly fail and then retrieve the IDF from the run directory, but this is a bit cumbersome, I guess there's a better way :)

edit retag flag offensive close merge delete

add a comment

4

answered 2021-01-14 14:40:29 -0500

Julien Marrec

29042 ●85 ●74 http://www.effibem.com/

If you need a one-liner without intermediate files, just call the CLI in a terminal like this:

openstudio -e "vt = OpenStudio::OSVersion::VersionTranslator.new; m = vt.loadModel('test.osm').get; ft = OpenStudio::EnergyPlus::ForwardTranslator.new; w = ft.translateModel(m); w.save('test.idf', true);"

edit flag offensive delete link

Comments

Thank you! Since I prefer python, I installed your bindings and can also do it with:

python3 -c 'import openstudio;openstudio.energyplus.ForwardTranslator().translateModel(openstudio.osversion.VersionTranslator().loadModel(openstudio.path("test.osm")).get()).save(openstudio.path("test.idf"), True)'

Adrien ( 2021-01-15 03:40:10 -0500 )edit

Yeah that works too, glad you're testing the python bindings too! I suppose we could also provide a CLI option directly... something like openstudio toidf <file> (or openstudio convert --idf <file>). Feel free to open an enhancement request on https://github.com/NREL/OpenStudio/is... if you think that'd be helpful.

Julien Marrec ( 2021-01-15 06:04:16 -0500 )edit

I don't need the extra CLI option, thanks :-)

Adrien ( 2021-01-22 05:50:02 -0500 )edit

add a comment

4

answered 2021-01-14 08:30:13 -0500

shorowit

10911 ●180 ●9 https://www.nrel.gov/b...

updated 2021-01-14 08:31:49 -0500

Here are two ways to generate the IDF using the OpenStudio CLI without running a simulation:

1. Use an OpenStudio Workflow (OSW)

Create a file called test.osw with the following contents:

{
  "seed_file": "test.osm"
}

Then run openstudio run -m -w test.osw, where the -m flag prevents the simulation from running. You will find the IDF at run/in.idf.

2. Use the OpenStudio SDK

Create a simple ruby script called generate_idf.rb with the following contents:

vt = OpenStudio::OSVersion::VersionTranslator.new
model = vt.loadModel(OpenStudio::Path.new("test.osm")).get
ft = OpenStudio::EnergyPlus::ForwardTranslator.new
model_idf = ft.translateModel(model)
File.open("test.idf", "w") { |f| f << model_idf.to_s }

Then run openstudio generate_idf.rb. It will create a test.idf file next to your test.osm file.

edit flag offensive delete link

Comments

Awesome, thanks!

Adrien ( 2021-01-14 08:34:52 -0500 )edit

Prefer using model_idf.save('path.idf', true) rather than File.open. The second argument (boolean) is whether you allow overwrite of an existing file or not.

Julien Marrec ( 2021-01-14 14:39:01 -0500 )edit

1

A long time ago, I was told that .to_s was much faster than .save. But I forget the exact reason (sorting objects?) and don't know whether it still applies.

shorowit ( 2021-01-14 14:49:52 -0500 )edit

It seems to be faster, yet I wouldn't recommend the File.open to newcomers :)

require 'openstudio'
require 'benchmark'

m = OpenStudio::Model::exampleModel()
ft = OpenStudio::EnergyPlus::ForwardTranslator.new
w = ft.translateModel(m)
w.save('test_save.idf', true)
w.save('test_open.idf', true)

n = 100
Benchmark.bm(7) do |x|
  x.report("save:")   { n.times do   ; w.save('test_save.idf', true); end }
  x.report("File.open:") { n.times do   ; File.open("test_open.idf", "w") { |f| f << w.to_s }; end }
end

Julien Marrec ( 2021-01-14 14:58:19 -0500 )edit

Results

                 user     system      total        real
    save:     1.024476   0.268156   1.292632 (  1.292821)
    File.open:  0.892978   0.015530   0.908508 (  0.917008)

Julien Marrec ( 2021-01-14 14:58:28 -0500 )edit

see more comments

How to export OSM to IDF with the command line?

2 Answers

Comments

1. Use an OpenStudio Workflow (OSW)

2. Use the OpenStudio SDK

Comments

Your Answer

Careers

Question Tools

Stats

How to export OSM to IDF with the command line? edit

2 Answers

Comments

1. Use an OpenStudio Workflow (OSW)

2. Use the OpenStudio SDK

Comments

Your Answer

Careers

Question Tools

Stats

How to export OSM to IDF with the command line?