Surface NAME_OF_SURFACE is referenced by more than one radiant system--this is not allowed

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@MJWitte Not quite. Two story building. First story floor touches ground. First story ceiling touches second story floor. Second story ceiling is roof. I wanted to have radiant cooling in the first story ceiling and radiant heating in the second story floor. Even though the radiant heating referenced the second story floor object and the radiant cooling referenced the first story ceiling object, energyplus outputted "* Severe * Surface NAME_OF_SURFACE is referenced by more than one radiant system--this is not allowed". Got around it by making the surfaces adiabatic, which works quite well.

The drawback of making the surfaces adiabatic is that the second story floor is now thermally isolated from the first floor ceiling. I would expect that the actual building will see some of the heat from the second story floor warm the first story ceiling, and likewise some of the cooling from the first floor ceiling would conduct into the second story floor. That won't happen with adiabatic surfaces.

@MJWitte Yeah, but hopefully the insulation makes heat transfer negligible between the floor and ceiling surfaces. Not perfect, but it works.

I would prefer the ceiling and floor to to have heat transfer between them though. Any ideas on how to pair the surfaces without an error? I fear the problem is in the C++ code for the object.

That's my suggestion above - create a pair of surfaces that cover half the area which contain the radiant cooling, and another pair of surfaces to cover the other half which contain the radiant heating. Again, not perfect, but maybe better, maybe not. The "problem" is that the solution technique for the surface heat transfer with internal source is currently formulated for a single source, not two.

@MJWitte So if I understand you correctly, exactly 1/2 of the floor area would contain radiant heating and 1/2 of the floor area would be a regular surface, exactly 1/2 of the ceiling area would contain radiant cooling and 1/2 of the ceiling area would be a regular surface? That way I could pair a 1/2 floor and 1/2 ceiling with only radiant heating and the other 1/2 floor and 1/2 ceiling with only radiant cooling?