I am hoping that someone could help me figure out if my radiator EDR calculations are valid as I am trying to figure out if my current boiler is undersized (we put an addition on and added a couple of radiators to the system).
First things first - Can someone confirm that I actually identified my radiators correctly as "column" type"? (please see attached pic). For the radiator in the picture I made the following calculations:
38" tall, 3 columns, and 4 sections - so the EDR I calculated was: 5sq per section x 4 sections = 20 sq ft EDR for entire radiator = 4800 BTU steam design output (20x240). Did I do this calculation correct?
I followed the same logic for the rest of my rads using the chart in the link below:http://www.columbiaheatingsupply.com/page_images/Sizing Cast Iron Radiator Heating Capacity Guide.pdf
I also have a couple of 4 tube rads that are 19" in height and one has 42 sections and one has 18. For those I followed the chart below and made the following calculations:
For the 42 section rad: 67.2x240=16,128
For the 18 section rad: 28.8x240=6912http://www.ocsind.com/cast-iron-radiators.php
And calculated that for all rads the combined steam design output is: 79449 (although I was unable to figure out a couple of my in-wall/recessed rads (please see attached pics and if someone knows how much they would "add" to my total that would be great.
So am I okay with my little Utica boiler for all the rads in the house? It look like it is rated for 90,000 BTU/HR.
Thanks for any help on this!!