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Radiant slab inlet temp completely under joists
An addition is served by two 70k btu air handlers west and east and happens to have under each zone 5" of insulated radiant slab with about 250 ft 1/2" pex run 12" OC. On the East, the slab is in an insulated crawlspace about 4 feet under an uninsulated (there is no further insulation blocking heat transfer through the floor) 3/4" plywood floor supported by TJI's and on the West the slab is 12" below the same type of floor.
The question is whether to mix the water such that it enters the slab at about 120-130, but it occurs to me that since floor temps arent an issue, and transfer is likely only fair, that there doesnt seem to be a reason not to just run it hot, since it will lose easily 5-10 degrees coming and going because it is 30 feet from the mechanical room. Does anyone have a reason not to run the slabs at a higher temp than mixed?