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SWA in U/F floor slab

whjohnson
Got a job where a new submain - approx 25 metre run in 16mm 3 core SWA. Embedded directly into a new concrete floor where wet U/F heating will be installed. Am trying to work out the best order of installation - that is, should the cable go in first, then the insulation, followed by the U/F pipework,and finally followed by the slab. Am not sure what order the u/f heating side will be installed and am also thinking about how if any correction factors may need to be applied for the current carrying capacity. I have sized the cable with a little overhead in mind in terms of actual final demand, but am still a little concerned about final slab operating temperature

Comments welcome.

PS - Am not liking this new format - it is like writing inside a letterbox when compiling posts!
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    My own UFH system is wet.  It comprises concrete slab, insulation, UFH tubing, engineered wood floor.  It is driven directly from a combi boiler, the boiler water i.e. the UFH water, cycles between 35 degrees C and 45 degrees C, the thermal inertia of the floor smooths this out and the floor is pleasantly warm to the foot, probably around 38 - 39 degrees.


    I think the cable needs to go in the slab under the insulation which should be near the base soil temperature if the insulation is doing its job, it will be hotter above the insulation.


    David
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  • 0
    My own UFH system is wet.  It comprises concrete slab, insulation, UFH tubing, engineered wood floor.  It is driven directly from a combi boiler, the boiler water i.e. the UFH water, cycles between 35 degrees C and 45 degrees C, the thermal inertia of the floor smooths this out and the floor is pleasantly warm to the foot, probably around 38 - 39 degrees.


    I think the cable needs to go in the slab under the insulation which should be near the base soil temperature if the insulation is doing its job, it will be hotter above the insulation.


    David
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