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Trouble using VRF components from the BCL in OpenStudio app v1.9

asked 2025-06-15 20:17:40 -0500

pmck's avatar

updated 2025-06-16 09:10:58 -0500

Hello,

I'm encountering an issue with OpenStudio application v1.9. I've downloaded components directly from the BCL within the application, but some aren't working as expected. For instance, I can drag and drop a VRF system from the library, but I'm unable to add the VRF zone terminal from the library.

Has anyone experienced this or know how to resolve it?

Thank you.

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answered 2025-06-19 07:52:43 -0500

updated 2025-06-19 13:30:25 -0500

Both the DAIKINREYQ 72 and the Fake VRF Outdoor Unit Example 2 outdoor units (from BCL) work with the default VRF indoor unit that comes with the App - tested with App 1.6.0, 1.8.0 & 1.9.0.

You should try out the Mitsubishi outdoor/indoor units, developed by @Ski90Moo. They are indeed available from BCL, but the lot gets lumped as a single terminal unit/component via BCL:

image description

Instead, add the downloaded Mitsubishi library osm as one of your default libraries (App Preferences > Change Default Libraries). Works for App 1.9.0.

image description

Couldn't get any of the LG units from BCL to work. These may no longer be supported:

  • GitHub repo is no longer available
  • designed for v1.9.0 ... SDK? App?.

However, a similar solution to the Mitsubishi units may work. I downloaded its .osc file, changed its extension to .osm, and also added it as a default library. I could drag and drop both outdoor and indoor LG units, but encountered FATAL errors when trying to run a simulation. The eplusout.err feedback is very informative, but I haven't taken a deep dive to debug the setup at this stage.


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Hi Denis,

Thank you sir for your very helpful information!

I can confirm that both the DAIKINREYQ 72 and the Fake VRF Outdoor Unit work with the default VRF indoor unit. I also tried the outdoor LG units with the default VRF indoor unit, but, as you mentioned, I encountered "FATAL" errors when trying to run a simulation. Thanks again for your help!

pmck's avatar pmck  ( 2025-06-19 11:05:28 -0500 )edit

Good to know. Have you tried the Mitsubishi units (added as a default library)? These work.

Denis Bourgeois's avatar Denis Bourgeois  ( 2025-06-19 13:21:43 -0500 )edit
1

Yes sir, The Mitsubishi units worked perfectly when added as a default library. I genuinely appreciate your detailed guidance and assistance with this matter.

pmck's avatar pmck  ( 2025-06-19 23:50:05 -0500 )edit
1

Super! Great work @Ski90Moo. If you found the answer satisfactory, it is customary to accept it by clicking on the checkmark. Helps others in the future.

Denis Bourgeois's avatar Denis Bourgeois  ( 2025-06-20 04:38:00 -0500 )edit
1

Thank you. Yes, you can get the LG objects to work, but you will need to do some editing to the curves (OS:Table:Lookup). Some of the LG lookup tables are missing a field. For example, the !- Heating Capacity Ratio Modifier Function of Low Temperature Curve Name only has Output Values up to 119. The independent variables have 8 and 15 values, so the total dependent variables (output values) should be 8*15=120. They count up in groups of 15 at which point it starts with a low number and starts counting up again, so you should be able to spot where it is missing.

Ski90Moo's avatar Ski90Moo  ( 2025-06-20 08:40:20 -0500 )edit

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Asked: 2025-06-15 20:17:40 -0500

Seen: 141 times

Last updated: Jun 20