thanks Chris.
In the end I’ve painfully modellled an aproximation in the OpenStudio App using some fluid-to-fluid heat exchangers.
It’s great to know you’re adding Radiant HVAC templates to LBT. Replacing the constructions of a bunch of ceiling surfaces (and their adjacent floors) has been really painful in OS. I think next time I’ll jump into Ironbug, now that I have a decent understanding on how things are supposed to work.