[Bldg-sim] Modeling Boiler Efficiency - Ec vs Et
David Reddy
david at 360-analytics.com
Wed Feb 11 09:02:32 PST 2015
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
On 2/10/2015 3:17 PM, Nicholas Caton wrote:
>
> 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. 192^nd St., #4-202
>
> Shoreline, WA 98133
> office: 785.410.3317
>
> www.catonenergy.com
>
> *From:*Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org
> <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
> <mailto: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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