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How simulate a GSHP coupled to TABS in OS?

asked 2025-07-02 15:56:09 -0500

MarcosH's avatar

updated 2025-07-03 10:32:29 -0500

Hello! I am trying to simulate a cooling system consisting of: a Ground Source Heat Pump connected to a Low Temperature Radiant System. I'm confused about how I must define the condenser and evaporator loops (Ground Heat Exchanger and RadiantSystem, respectily) of the Heat Pump. I would be grateful if you could guide me to correctly define these connections in the Plant Loop.

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answered 2025-07-03 05:17:12 -0500

I suggest going at this in steps (e.g. make sure your model first works with TABS, then look at integrating GHX).


Peruse through the OpenStudio-Resources simulation tests: CTRL-F "low" (3 hits - only 2 offering cooling):

Each example holds 3 files:

  • OpenStudio model (.osm)
  • Ruby script (.rb)
  • Python script (.py)

Both the .rb and .py files are structured and commented so you get a sense of required items, step-by-step logic/implementation, etc. You can open the example .osm files using the OpenStudio Application, go over the plant/system layouts, run simulation tests, etc., before attempting adaptations to your model.

You can eventually do the same for GSHP: CTRL-F "ghx".


Hope this helps ...

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Thanks, @Denis Bourgeois. I simulated the low-temperature surface in a (prototype) building in OS and then included a horizontal ground-based heat exchanger. This scenario represents my actual prototype, and I obtained simulation results. Now, I need to test a cooling heat pump that works among the aforementioned components. Should I test a water-to-water cooling heat pump, for example? Thanks for your advice !

MarcosH's avatar MarcosH  ( 2025-07-03 13:22:10 -0500 )edit

@MarcosH : My hint to adapt your model in steps is simply a practical suggestion. Too risky to take on everything at once, especially if testing fairly rare combinations (GSHP <> TABS in cooling mode). But if your simulations are running error-free (check eplusout.err file), then by all means proceed at your own pace.

Denis Bourgeois's avatar Denis Bourgeois  ( 2025-07-03 16:18:04 -0500 )edit

Your initial question is general in nature (i.e. GSHP, TABS, connections ... vs OpenStudio). The provided links address your question, I think. Maybe go through related UMH posts (e.g. here). Beyond that, I suggest you continue your efforts (step-by-step, checking logged errors and warnings), and if needed post another UMH question (more specific next time, hopefully with a public link to your .osm file).

Denis Bourgeois's avatar Denis Bourgeois  ( 2025-07-03 16:25:02 -0500 )edit

Thanks for your advice. I'm trying to simulate experimental prototypes (focusing on research), which aren't the systems typically used for heating/cooling. I'd like to know how to configure a plant loop system (e.g., a low-temperature radiant system) to operate in free-run mode, that is, avoiding control by the setpoint controller. Thank you so much!

MarcosH's avatar MarcosH  ( 2025-07-07 13:21:40 -0500 )edit

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Asked: 2025-07-02 15:56:09 -0500

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Last updated: Jul 07