[Bldg-sim] Modeling Boiler Efficiency - Ec vs Et

Nicholas Caton ncaton at catonenergy.com
Tue Feb 10 15:17:01 PST 2015

Hi Christopher,

We had a relatively thorough discussion on this issue over on the
[eQuest-users] mailing list in the spring and fall of last year.  See
attached emails.  (I’ve had a few reports of my attachments not getting
through lately – let me know off-list if you have the same problem and I’ll
copy-paste the text).

Note the same problem of how to arrive at thermal efficiency (rather than
combustion less flue/jacket losses) exists in 90.1-2007.  At one point, I
laid out a series of logical approaches to the matter in order of
increasing difficulty & increasing performance in one of those threads.
“Easiest” approach would be to do as you suggest and treat Ec = Et (and in
turn to treat the Proposed in a similar fashion, deliberately EXCLUDING
flue/jacket losses in the simulation).



*Caton Energy Consulting*
  1150 N. 192nd St., #4-202

  Shoreline, WA 98133
  office:  785.410.3317


*From:* Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf
Of *Jones, Christopher
*Sent:* Tuesday, February 10, 2015 8:07 AM
*To:* bldg-sim at lists.onebuilding.org
*Subject:* [Bldg-sim] Modeling Boiler Efficiency - Ec vs Et

90.1-2010 lists the efficiency of a boiler >= 2.5 MBTUh at Ec = 82% as of
3/2/2010.  For modeling purposes does one enter 82% as the efficiency?  How
does Ec related to Et for modeling purposes?

*Christopher Jones**,* P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

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