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Delta T question

Peddler
Peddler Member Posts: 1
What's the recommended Delta t for in-slab radiant systems? Supply water vs return water?

Comments

  • KCA_2
    KCA_2 Member Posts: 308
    A larger DT

    Has more BTU's associated with it. In other words, 20deg DT @ 1 GPM has 10MBTU off into the space. @ 10deg DT there is only 5MBTU and a 30deg.. Well..

    The issues are: design & comfort. I like to use a 10deg DT if I'm able and if the design allows (a lower DT means more tube, in most cases). 10deg across the floor (tile especially) is less detectable to the feet than a 20deg. But I think most guys utilize a 20deg DT.

    :-) Kca
    :-) Ken
  • Dave H_2
    Dave H_2 Member Posts: 587
    Water Temp Drop

    It can vary depending upon the project.

    Residentailly I like to design 10-15 degree drop. That keeps the floor surface temps even and eliminates temperature "streaking" across the floors.

    For snow melting, I like to use a 30 degree drop, keeps your circulator sizing down to a minumum. The same also applies for commercial radiant floors, longer loops, higher temp drops.

    Dave H.

    Dave Holdorf

    Technical Training Manager - East

    Taco Comfort Solutions

This discussion has been closed.