Radiator edr and equivalent output
Hi there. I'm hoping someone can sanity check my math on calculating the edr and thus btu/hr of this rad. I'm also trying to compare this to electric radiant heat.
4 columns. 38" tall by 8" wide x 7 sections.
The table in looking at puts 38" 4 column at 8sqft per section. So 7x8x240btu/hr = 13,440btu/hr assuming 215 degree steam and 70 degrees ambient.
Does this seem right?
And then... 1watt = 3.41btu/hr so... 13,440btu/3.41 = 3941watts.
Is this a reasonable comparison? Is it fair to say this rad is roughly equal to 2 2000w electric panel convertors?
Thanks
Comments
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8 sqft per section is WAY off.
Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
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That's an oddball. The usual 4-column rad is 12 inches deep. 8 inches is in between a 2- and a 3-column. If I had to guesstimate, I'd say to use the 3-column value of 5 square feet per section, which would amount to 35 square feet.
Is there a name on that rad? Check around the pipe connections.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting1 -
Right? Everything I could find that looked anything like it with 4 columns was 11ish inches deep. But multiple charts placed 4 column rads of that height at 8sqft. Output number seemed too high. Do you see anything on my methodology that would lead me astray if I recalculate with 5sq per section?
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Using 5sqft/section times 7 sections times 240btu for 8400btu/hr. Divided by 3.41 for 2463 watts for comparison to an electric rad.
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Why do you want an electric rad if you have a steam system?
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting
1 -
Oh I don't. At all. Need heat in space that used to have rads. They were removed when the space was a bakery. Minimal piping would be required to put them back but the boiler is much smaller than it was then and in trying to see if there's capacity. None of the mains are insulated. I'm hoping that by insulating the pipe I'll basically cancel out the additional load of 2 radiators like the one pictured. If they shake out to be roughly equal to 5kw of radiant electric heat, it should be plenty for the space. The other option is to install a couple of electric heaters which seems as dumb to me as it does to you but I don't own the building.
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Your calculations are right but the rad measurements don't line up with anything I have.
I show 4 column @11 1/2" wide which would be 8 square ft/section
3 column is 9" wide 5 square ft/section
I would guess you have about 6 sq feet/section because the 4 column give you a little more surface area.
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There's a good chance that it's a Canadian manufactured rad from the 20s or 30s.
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Go back further. Ornate rads went out of production around 1920.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting1 -
Probably about midway between a 4 column and a 4 tube which would put it 6-6.5sqft range.
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