VRF units connected to water loop with Ironbug

grasshopper ironbug
1

Hello @MingboPeng,

I am trying to connect a bunch of VRF condensing units to a cooling tower and heat exchangers water loop. Is this possible with Ironbug?. I generated an openstudio file with just the doas cooling coils connecting to the water loop and then I tried to follow what @chris suggested here vrf water using the Openstudio measure, but it fails when trying to run with the following error:

[15:37:23.347623 ERROR] invalid null reference Expected argument 2 of type std::string const &, but got NilClass nil
in SWIG method ‘setString’
C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in setString' C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in block in run’
C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in each' C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in run’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:504:in apply_measure' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run' :/openstudio_cli.rb:975:in execute’
:/openstudio_cli.rb:763:in execute' :/openstudio_cli.rb:1746:in ’
eval:116:in eval' eval:116:in require_embedded_absolute’
eval:101:in block in require' eval:95:in each’
eval:95:in require' eval:3:in ’
[15:37:23.349623 ERROR] :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb failed with message Runner error :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb failed with invalid null reference Expected argument 2 of type std::string const &, but got NilClass nil
in SWIG method ‘setString’, C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in setString' C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in block in run’
C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in each' C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in run’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:504:in apply_measure' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run' :/openstudio_cli.rb:975:in execute’
:/openstudio_cli.rb:763:in execute' :/openstudio_cli.rb:1746:in ’
eval:116:in eval' eval:116:in require_embedded_absolute’
eval:101:in block in require' eval:95:in each’
eval:95:in require' eval:3:in ’ in :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:530:in rescue in apply_measure' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:490:in apply_measure’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform’
:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step' :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run’
:/openstudio_cli.rb:975:in execute' :/openstudio_cli.rb:763:in execute’
:/openstudio_cli.rb:1746:in <main>' eval:116:in eval’
eval:116:in require_embedded_absolute' eval:101:in block in require’
eval:95:in each' eval:95:in require’
eval:3:in <main>' [15:37:23.350623 ERROR] Found error in state 'ep_measures' with message [":/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb failed with message Runner error :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb failed with invalid null reference Expected argument 2 of type std::string const &, but got NilClass nil\n\tin SWIG method 'setString', C:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in setString’\nC:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:66:in block in run'\nC:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in each’\nC:/Users/Earlkase/AppData/Local/Temp/OpenStudioApp.Ew6180/resources/measures/Connect_VRFs_to_Ground_Loop/measure.rb:65:in run'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:504:in apply_measure’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run’\n:/openstudio_cli.rb:975:in execute'\n:/openstudio_cli.rb:763:in execute’\n:/openstudio_cli.rb:1746:in <main>'\neval:116:in eval’\neval:116:in require_embedded_absolute'\neval:101:in block in require’\neval:95:in each'\neval:95:in require’\neval:3:in <main>' in :/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:530:in rescue in apply_measure’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:490:in apply_measure'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run'\n:/openstudio_cli.rb:975:in execute’\n:/openstudio_cli.rb:763:in execute'\n:/openstudio_cli.rb:1746:in ‘\neval:116:in eval'\neval:116:in require_embedded_absolute’\neval:101:in block in require'\neval:95:in each’\neval:95:in require'\neval:3:in ‘::/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:639:in rescue in apply_measure'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:645:in apply_measure’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:109:in block in apply_measures'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in each_index’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/util/measure.rb:67:in apply_measures'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/jobs/run_ep_measures.rb:57:in perform’\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:285:in step'\n:/ruby/2.2.0/gems/openstudio-workflow-1.3.4/lib/openstudio/workflow/run.rb:232:in run’\n:/openstudio_cli.rb:975:in execute'\n:/openstudio_cli.rb:763:in execute’\n:/openstudio_cli.rb:1746:in <main>'\neval:116:in eval’\neval:116:in require_embedded_absolute'\neval:101:in block in require’\neval:95:in each'\neval:95:in require’\neval:3:in `’"]}

I would deeply apreciate your help.

Thank you in advance
Arturo

2

Hi @LUISARTUROREYESVALEN , in new OpenStudio 2.9 release, they have add the capacity to link VRF to water loop. But I remember there was a bug it crashes OpenStudio App, not sure if they have fixed it in 2.9.1.

I would suggest you to build a simple model to test this in OpenStudio App. Otherwise, I will get back to this sometime next month.

3

Thanks for the update @MingboPeng, I´ve been trying, but it does crash when you try to drag vrf units from the library. And from my model I can´t see the condenser units, only the indoor units appear. I´m moving to energyplus directly to see if I can do it there.

Thanks for your time!!.
Arturo

4

Hi @LUISARTUROREYESVALEN I would suggest you to add an issue for openstudio team. https://github.com/NREL/OpenStudio/issues

5

I will post it.

Thanks!