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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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).
~Nick
*NICK CATON, P.E.*
*Owner*
*Caton Energy Consulting*
1150 N. 192nd St., #4-202
Shoreline, WA 98133
office: 785.410.3317
www.catonenergy.com
*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
______________________________________________________________________
NOTICE: This communication and any attachments ("this message") may contain
confidential information for the sole use of the intended recipient(s). Any
unauthorized use, disclosure, viewing, copying, alteration, dissemination
or distribution of, or reliance on this message is strictly prohibited. If
you have received this message in error, or you are not an authorized
recipient, please notify the sender immediately by replying to this
message, delete this message and all copies from your e-mail system and
destroy any printed copies.
Hi Chris and Nick,
For some reason the emails Nick forwarded did not come through properly,
so perhaps he covered this. If not, I can say this same question has
come up in developing compliance software, and an equation is published
in the 2013 T24 NACM:
Et = Ec ? 0.015 (Where Ec and Et are fractions)
For background, this equation was informed by comparing the thermal and
combustion efficiencies published for large boilers in the AHRI database.
- David