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Old Radiator EDR to BTU
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Brad White_9
Member Posts: 2,440
Each radiator style has an associated Square Feet EDR for each section, height and number of tubes. Buy Dan's book "EDR" as one place to start. They do vary, those radiators.
Typically, the 240 BTUH per EDR rule is for 215 degree steam (1 PSIG) in a 70 degree room.
With hot water at an average temperature of 170 degrees (e.g. 180 in/160 out) the BTUH drops to 150 in the same 70 degree room.
Typical gain or degradation depending on the average water temperature is about 20 BTUH per ten degrees change.
In Other Words:
AWT degrees F/ BTUH per EDR
100/ 10
110/ 30
120/ 50
130/ 70
140/ 90
150/ 110
160/ 130
170/ 150
180/ 170
190/ 190
200/ 210
Typically, the 240 BTUH per EDR rule is for 215 degree steam (1 PSIG) in a 70 degree room.
With hot water at an average temperature of 170 degrees (e.g. 180 in/160 out) the BTUH drops to 150 in the same 70 degree room.
Typical gain or degradation depending on the average water temperature is about 20 BTUH per ten degrees change.
In Other Words:
AWT degrees F/ BTUH per EDR
100/ 10
110/ 30
120/ 50
130/ 70
140/ 90
150/ 110
160/ 130
170/ 150
180/ 170
190/ 190
200/ 210
0
Comments
-
Old Radiator EDR to BTU
Trying to determine how many btu's where emitted from an old cast iron radiator that has been converted to hot water. My understanding is - there were 3 types of cast iron radiators, column, slim-tube and large-tube. Column and large-tube were manufactured prior to 1950 and slim-tube was and still might be manufactured today. I'm assuming that I am dealing with column or large-tube. Was each radiator made up of several "columns" or "large-tubes" separated by spacers? If so, would the surface area be calculated for each "column" or "large-tube" rather than the square footage of the front surface of the radiator (i.e. 4 ft. height X 10 ft. length = 40 square feet). I am thinking that the example is wrong and that the surface area is calculated for each "column" or Large-tube" of the radiator. That being the case, how many square feet are in (1) "column" or "large-tube" that is 45 inches high X 15" deep? I'm coming up with 10. There are 21 "columns" or "large-tubes" so that would total 210 sq. ft. - if one sq. ft. is equal to (1) EDR and (1) EDR is equal to 240 btu's is it fair to say that 210(sq.ft.) X 240 (btu's) = 50,400 btuh or 50.4 MBH0 -
You're on the right track
Square feet EDR is a measure of the surface area of radiating metal. Heat output might vary between radiators of the same dimensions when they're different types. The idea is to consider the surface area - the interface between the hot steam or water inside the radiator and the cooler air in the room - to level the playing field.
Here's an online guide that describes cast iron radiator sizing, with charts for standard radiator types:
http://www.colonialsupply.com/resources/radiator.htm
Dan's Lost Art book has even more charts for standard radiators, and the EDR book has sizing information for more esoteric radiation.
Mark0 -
-
To know one's EDR
is to know one's self, Grasshoppa.0 -
Enlightenment
Best of luck with your project, Tim!0
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