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Posted by HeatPro on December 11, 2007 at 21:51:27:
In Reply to: Re: steam boiler sizing posted by steve on December 11, 2007 at 20:53:37:
: ++++ Is it better to go under or over when using the net value. You might be in between boiler sizes or just slightly higher than the smaller size. Can one safely say if it is close go down and let the extra 33% take care of it?
-- The extra 33% is to allow for the pipe and heating up the mass of the water, boiler, pipe and radiation. Some systems have VERY large pipes, others not. 33% is a good guess; but 50% more than the radiation is also a good guess.
: ++++ The sq ft of steam seems to differ quite a bit between manufacturers even for comparable BTU/h boilers. Why is this and more importantly what effect does it have?
-- you are comparing different boilers made differently with more or less capacity. The boilers are different because the numbers are what the boilers are tested to be.
Is using new convertor tables such as those from rittling.com accurate enough for the old convectors? Their convector tables don't seem to convert to btu/h by using a straight EDR*240.
-- Rittling tables are for their convectors.
And is 240 the best value to use or should one use an alternate value?
-- 240 is the value used in the old testing labs.
: ++++ If boiler performance is only boiler related why would the burner matter?
-- If car ratings are only for the car, why would the motor matter?
: Are there any energy star rated gas steam boilers?
--Northshore Welding lists gas energy star boilers:
http://72.14.209.104/search?q=cache:Lg85uSilCrQJ:www.energystar.gov/ia/products/prod_lists/boilers_prod_list.pdf+energy+star+rated+steam+boiler&hl=en&ct=clnk&cd=1&gl=us