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BTU output of 1 1/4 copper

Hello to all,
I'm sizing a replacement STEAM boiler and wanted to know the BTU output of a 1 1/4 inch finned copper "radiator". Anyone know?
Thanks!
Michael.

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 22,897
    How big are the fins? Spacing?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • charliechicago
    charliechicago Member Posts: 130
    Not sure, will get back to you soon with info.
    Thanks.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,525
    edited February 2021
    Here is one brand that may get you close. Look at the ST 1200-3A at around 210° or somewhere between 210° and 220°



    this is what it looks like. if your emitters are similar, then this will be close enough.



    There are other configurations of 1-1/4 copper elements at this manufacturer web site
    https://www.haydoncorp.com/catalog/category/commercial-baseboard

    Yours truly,
    Mr.Ed


    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • charliechicago
    charliechicago Member Posts: 130
    Thanks
  • 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
  • mattmia2
    mattmia2 Member Posts: 9,409
    edited February 2021
    Isn't knowing what sort of cabinet it is in and the pitch of the fins important here? So a picture would be good.
  • charliechicago
    charliechicago Member Posts: 130
    I’ll get a picture too. 
  • charliechicago
    charliechicago Member Posts: 130
    The fins are 5 per square inch.
    They are 3 by 3.5


  • Jamie Hall
    Jamie Hall Member Posts: 22,897
    You can come reasonably close to the EDR if you remember that EDR is actually a measure of the effective radiating surface area.

    So... each fin has about 10.5 square inches on each side, or 21 square inches per fin, but you need to subtract the area of the hole for the pipe -- a bit less than 2 square inches. But then add the surface area of the pipe between fins. And call it 20 square inches per fin. And you have 5 fins per inch length of pipe (I think that's what you meant to say). So call it 100 square inches per inch, or 1200 square inches per foot of pipe. So... a very close approximation of the EDR would be 8 for each foot of finned pipe.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • charliechicago
    charliechicago Member Posts: 130
    Wow, thanks.
    So if I have 86 feet of this piping I come out with 165,120 BTU?
    86 times 8 times 240.
  • Jamie Hall
    Jamie Hall Member Posts: 22,897
    Looks about right -- always assuming that the air can circulate over those fins.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England