I have not followed this thread closely, but I doubt that it’s a simple matter to model a specific boiler’s part-load efficiency without a lot of data. I think some of the condensing boiler catalogs have enough data to make a decent curve, but I don’t know if it’s common.
For a Baseline boiler, I agree with Francesco – it’s not worth spending a lot of time refining the efficiency of a “fictitious” piece of equipment. My approach so far is to use the ASHRAE 90.1 required efficiency and also to use a curve that reflects some degradation at low loads. After I read the AHRI test procedure (and after I wake up the next morning J) I’ll see if that makes sense.
Thanks for the link Francesco!
Thank you Javed,
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