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sizeing radiation

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Dan467
Dan467 Member Posts: 11
in THE MAIN WALL
If i have the edr of a convector suplied with 180 degree water how do i convert it to btu output 0f a boiler? Also sq ft of radiator to btu out put?

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  • Ironman
    Ironman Member Posts: 7,376
    edited June 2011
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    Multiply...

    The square footage x 150 for the btu output at 170* average water temp. The boiler will generally have 3 ratings: input; output (input x efficiency); and I+B+R (output x .85). This final number allows for a 15% piping loss. Actual loss may be more or less depending on piping material, length of run, pipe insulation, water temp, etc.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Dan467
    Dan467 Member Posts: 11
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    sizing radiation

    thanks for the sq foot info how about edr?
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,002
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    EDR

    At 180 degrees, each EDR equals 170 BTU's.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
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