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Hydronic underfloor used to effectively enlarge direct solar thermal mass?
I'm in the early stages of planning a new build. I'm considering a heat
pump underfloor heating system in concrete slab. The house will be
carefully optimised for passive solar gain as well. Has anyone heard of
using the underfloor plumbing to move heat around the slab from areas
receiving direct solar illumination to other parts of the slab? The thinking being that this system will effectively enlarge the amount of thermal mass in the house that can be considered direct solar thermal mass for the purposes of the passive solar design.