Hi I model these systems all the time. here is what you have to do...
- assign internal source construction to your ceilings where you will have the radiant panels
- put all the ceilings you have in the surface group object for one zone
- Fill out the ZoneHVAC:LowTempratureRadiant:VariableFLow, you might not have created these nodes previously so you will need to identify the hot water and cold water nodes with your own unique names
- put your ZoneHVAC:LowTempratureRadiant:VariableFLow onto your equipment list for the zone
- make sure your equipment connections are filled out for the zone, none of your nodes in ZoneHVAC:LowTempratureRadiant:VariableFLow will be in here
- make two branches for your ZoneHVAC:LowTempratureRadiant:VariableFLow one for the cold side, and one for the hot side
- add your branches into your branchlist for the demand side of your hot water loop, and the demand side of your chilled water loop
- set up the boiler or district heating supply side of the loop (if you don't already have this)
- set up the chiller supply side of the loop (if you don't already have this)
I do this in EnergyPlus and can help if you need more with this if you need more information.
