How to model GSHP with radiant floor heating in OpenStudio?

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Thanks so much, Matthew. I appreciate your quick response and detailed illustration. The tutorial you linked was so helpful that I could model GSHP, GLHEPro seems not for free though. However, there still remains a problem, like plugging radiant heating system into the WSHP. It seems to me yours also doesn't look like low temp radiant heating/cooling. A tutorial for radiant conditioning suggests to use HW boiler as a supply equipment. That said, I thought WSHP could also make sense, and attempted to connect the radiant equipment to WSGP, but heat/cooling load resulted in blank....

I'm not sure you'll be able to successfully run a model with a condenser loop connected to hydronic systems. I've typically seen these connected to zone heat pumps, do you have a particular design that specifies this configuration? . You could try building the radiant system using the link I provided above and then connect it to the condenser loop. However, if the model runs successfully the HVAC system may not be capable of heating/cooling adequately due to the relatively steady condenser water loop temperatures which are typically 80-90F.