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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):

• lowtemprad_constflow
• lowtemprad_varflow

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 ...