Steam radiator volume

gerry gill

.025 cubic foot per square foot edr for column radiators..perhaps Dan or Steamhead can address this more as to the charts origins.

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Bill_6

Steam radiator volume; cubic feet

I'm trying to figure out the cubic feet of all my radiators. I know the EDR = 640 sq ft. Are there charts that the dead men knew about ? All my rads are 3 column 45" tall.

Steamhead

I have the same chart

Dan was the one who dug it up, not sure where though....

Don't see many 45-inch rads around here.... maybe they were too tall for the average Baltimore installer to handle... ;-)

gerry gill

heres another method,

Here is another way to find the cubic footage of a radiators air that I like. This method requires some math, but its not hard. In the Peerless Boiler Companies training manual entitled ‘’color of water’’ they list the GALLON content of various heat emitters . a cast iron column radiator holds , according to Peerless Boiler, .114 gallons of water per square foot edr. That’s (‘’point’’114). Okay, so say you have a 50 square foot edr radiator. Then 50 times .114 equals 5.7 gallons. Now there is 231 cubic inches to a gallon. So 5.7 times 231 equals 1316.7 cubic inches in the radiator..okay now there is 1728 cubic inches in a cubic foot, so 1316.7 divided by 1728 equals .76 cubic feet of air..

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Bill_6

I'm just making it harder ! But .........

Dan's chart = .025 Cu Ft / 1 EDR

Peerless = .114 gallons / 1 EDR == .01524 Cu Ft

My cad drawing = .0225 Cu Ft / 1 EDR @ 1/8" thick walls

If we use Dan's # then .025 * 6 = 0.15 Cu Ft for 1 - 3 column section 45" tall. That's in the ballpark.

Now we go through the back door !

If I multiply 6 * 240 == 1440 BTUs/Hr for 1 - 3 column section 45" tall.

If I'm getting 1440 BTU's/Hr into the room I've got to have that much or more going through the rad. Right ?

If the room stays at 70 F for a full hour.

It takes 970 BTU's to boil off 1 Lb of water and that gives you 28 Cu Ft of steam so 1440 BTU's should boil off 1.485 Lbs @ 39 Cu Ft. 39/.15 = 260 so in 3600 seconds 3600/260 = 14 seconds. Every 14 seconds the rad will condense the steam inside back to water. Of course it's a continous cycle it doesn't really happen in blocks of time.

Is that about right ?

Now after the boiler gets the water up to 212 + some, do the 1440 BTU's get added over an hours time ? Which would be .4 BTUs / second.

gerry gill

holy smokes Bill,

I thought I had time on my hands, hehe, all that math already has my brain hurting..hehe

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