How to calculate EDR for convector radiator?

Glenn Sossin_2

Leah Frances

Since consensus is that I need a new boiler (http://forums.invision.net/Thread.cfm?CFApp=2&Thread_ID=54298) I began looking at the total EDR of my house.
It was easy to find a chart for our tube radiators, but not the convectors-style.
They are 32" long, about 9" from the floor. They are 6" wide by 6" deep, 3 sections bolted together.
Attached photos show front, from below, end, and middle...
Any guesstimates?
Thanks,
Nelson

Larry in Elkins Park_4

Can't anyone answer this?

I can't believe no one can give guidance on this question. There was a similar question recently and the answer was "go buy the book". I have what appear to be 3 of the same convectors (different lengths) and in calculating my EDR for boiler replacement had to settle for a guess for these as they simply were not available on-line anyhwere (Burnham has a great document available, but it does not show these). To buy a technical book on sizing which will be used by a homeowner for one quick reference in this day and age of shared and available information (or even in earlier ones, my wife used to be a librarian with the Free Library of Philadelphia and they always had a policy of providing quick reference before the the digital age) is not a practical answer, and seems to be beneath the idea of sharing information here. If someone sent a provate answer, I apologize for most of this, but stll you would think that was information that could be shared.

kpc_9

never saw..

the thread...until now. How tall? My Burnham Heating helper has 6 1/2" convectors w/ a cabinet length of 33 1/2"...depending on the height 18"-23, 20"-25,24"-28.9, 26"-30.4,32"-32.9....hope this helps...kpc

Wayco Wayne_2

Looks like

a Utica Cast Iron Convector. as found on page 261 of Dans book EDR (Every Darn Radiator). (Doesnt everyone have this gem of a reference book?) Total Sq Ft depends on Height of enclosure. If the enclosure is 20" tall the sq ft is 22.3. 24 inch tall the sq ft =23.9. 32 in tall=25.7 and so on. You then pick your EDR based on water temperature. For example 180 F water = 170 EDR times the sq ft of the convector. For example the 24 in tall convector the sq ft (23.9) times the EDR (170) = 4063 btuh. I hope this helps. WW

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Nelson_5

Thanks that info...The outer cabinet is 22" by 40"...Also, I have one-pipe steam, so I was looking for the square foot EDR based on steam. Looks like 23 would be a good guess? (and that's all I really want anyway!) Most of my other radiators (18 sections, 4 tube, 19" high) seem to be about 40 sq. ft.

Wayco Wayne_2

22 x 40 would be

26.3 sq ft. Steam EDR of course is 240. total BTU would be 6312 btuh. WW

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