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Steam Boiler Sizing

gehring_3
gehring_3 Member Posts: 74
in THE MAIN WALL
What is the rule of thumb (if there is one) on the range or percentage of steam capacity vs. connected load that must or should be connected to provide optimal performance on a one pipe steam system?

For example, I have a boiler that is rated for 512 sq. ft. and presently have 461 sq ft of connected load (which represents 90% of capacity).

Would the system be more efficient if I hooked up an additional 51 sq. ft of radiation (or as close as possible) to get the total connected load closer to the rated capacity?

I am just wondering if it would make any difference on system performance, etc. Is there an optimal "range" or percentage of total capacity that is ideal?

Await your comments. Thank you.

Comments

  • Alan(CaliforniaRadiant)Forbes
    Alan(CaliforniaRadiant)Forbes Member Posts: 1,243
    Carl

    Have you read this?

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  • gehring_3
    gehring_3 Member Posts: 74
    Yes

    Yes. I have read that. But that does not answer my very specific question. That is, what is the "range" of optimal EDR vs. total capacity?? Boiler capacities make a big jump as you go from 3 sections to 4 sections to 5 sections and so forth while the exact EDR in everyone's house is different and usually never matches EXACTLY to the particular boiler's rated size. SO, therefore, is it acceptable to be running 90% EDR vs. rated capacity OR (here is my specific question) - would the system run even better if additional radition was hooked up to bring it up to or closer to 100% ? (Do not consider the question on whether or not certain rooms would overheat or where to put the radiators, etc. that is not a factor in this particular and very specific analysis). Thanks.
  • Richard Sills
    Richard Sills Member Posts: 1
    Crane steam gas boiler

    Looking to identify a Crane boiler model OUBA??? thats what my customer gave me. It has a Wayne gas conversion burner on it 200btu. I have looked in the hydronics rating handbook and other old books with boiler mfg. listing. Not coming up with anything. If anyone has anything on this, let me know so I can properly cross reference to a current boiler model...rs
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