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BTU output of 1 1/4 copper
charliechicago
Member Posts: 130
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.
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.
0
Comments

How big are the fins? Spacing?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 
Not sure, will get back to you soon with info.
Thanks.0 
Here is one brand that may get you close. Look at the ST 12003A 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 11/4 copper elements at this manufacturer web site
https://www.haydoncorp.com/catalog/category/commercialbaseboard
Yours truly,
Mr.Ed
Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics0 
Thanks0

Some more information here:
https://www.slantfin.com/wpcontent/uploads/2016/04/FinTubeSelectionGuide820.pdf8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 
Isn't knowing what sort of cabinet it is in and the pitch of the fins important here? So a picture would be good.0

I’ll get a picture too.0

The fins are 5 per square inch.
They are 3 by 3.5
0 
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 England0 
Wow, thanks.
So if I have 86 feet of this piping I come out with 165,120 BTU?
86 times 8 times 240.0 
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 England0
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