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The internal source construction object is built incorrectly:

Relevant EnergyPlus InputOutput Reference section:

You'll want to re-do your internal source construction and place a thin layer (< 2 inches or 0.05 meters) of mass material (concrete) as the inner most layer in your construction. Then specify the layer number. If your construction has 4 layers, you'll want to set the source layer as "3". Unfortunately, there isn't a way to edit this in the OpenStudio App. You need to open the .osm file in a text editor, find the "Construction:InternalSource" object, and manually enter the layer number where you want the radiant tubing:

Another issue with your model is that the design temperatures for the radiant hot/cold water loops are very different from the operational setpoints. Your system is sized to run with a larger temperature difference than is supplied in operation. This will cause your system to be undersized.

The internal source construction object is built incorrectly:

Relevant EnergyPlus InputOutput Reference section:

You'll want to re-do your internal source construction and place a thin layer (< 2 inches or 0.05 meters) of mass material (concrete) as the inner most layer in your construction. Then specify the layer number. If your construction has 4 layers, you'll want to set the source layer as "3". Unfortunately, ~~Unfortunately, there isn't a way to edit this in the OpenStudio App. You need to open the .osm file in a text editor, find the "Construction:InternalSource" object, and manually enter the layer number where you want the radiant tubing: tubing~~:

Another issue with your model is that the design temperatures for the radiant hot/cold water loops are very different from the operational setpoints. Your system is sized to run with a larger temperature difference than is supplied in operation. This will cause your system to be undersized.

The internal source construction object is built incorrectly:

Relevant EnergyPlus InputOutput Reference section:

You'll want to re-do your internal source construction and place a thin layer (< 2 inches or 0.05 meters) of mass material (concrete) as the inner most layer in your construction. Then specify the layer number. If your construction has 4 layers, you'll want to set the source layer as "3". ~~Unfortunately, there isn't a way to edit (edit) You can do this in the OpenStudio App. You need to open App - if you scroll down in the .osm file Construction:InternalSource object in a text editor, find OpenStudio, you can set the "Construction:InternalSource" object, and manually enter the layer number where you want the radiant tubing~~: source layer.

Another issue with your model is that the design temperatures for the radiant hot/cold water loops are very different from the operational setpoints. Your system is sized to run with a larger temperature difference than is supplied in operation. This will cause your system to be undersized.