Question-and-Answer Resource for the Building Energy Modeling Community
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If the water reservoir is at known temperatures, you could use this directly as the slab outside boundary condition, using OtherSideCoefficients as the outside boundary condition (see SurfaceProperty:OtherSideCoefficients) to set scheduled outside surface temperatures.
Or, if the reservoir is stagnant, I suppose you could added it as another layer in the slab construction.
