[Equest-users] Boiler Curves in Library

[Erik Kolderup via Equest-users]

Doesn't directly answer your question, but this report by Taylor
Engineering and PG&E discusses the DOE2.2 boiler curves and compares to
measured boiler performance:
http://www.etcc-ca.com/sites/default/files/OLD/images/boiler_research_project_-_ats-te_final_report_pcb_05092012.pdf
.


-Erik

*Erik Kolderup, PE, LEED AP*
erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com

On Thu, Jan 5, 2017 at 9:39 AM, Bishop, Bill via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> Hi Brad,
>
> I don’t know how the default boiler curves were developed, but…
>
> It is easy enough to create custom curves based on manufacturer
> performance data, which is available for many boiler models.
>
> There are other inputs that affect simulated fuel consumption in eQUEST
> besides the boiler HIR-FPLR curve and full-load HIR, including MIN-RATIO
> and STANDBY-TIME. If the boiler part-load ratio is below the MIN-RATIO,
> there are cycling losses based on the STANDBY-TIME. The MIN-RATIO is
> usually known based on the boiler model but I don’t think I’ve seen
> published numbers on cycling losses sufficient to calculate STANDBY-TIME.
> But I have adjusted the defaults when calibrating a model to known fuel
> consumption.
>
> The ASHRAE Handbook has some reference material. S32.6 is on boiler
> efficiency and includes an efficiency curve for a modulating boiler,
> showing efficiency improving slightly at part loads (instead of degrading)
> “from the increase in the ratio of heat exchanger surface area to heat
> input as the firing rate is reduced”. F19.12 Boiler Model provides some
> fundamental research and lists references if you want to dig into it
> further.
>
>
>
> Regards,
>
> ~Bill
>
>
>
> *William Bishop, PE, BEMP, BEAP, CEM, LEED AP **|** Pathfinder Engineers
> & Architects LLP*
>
> *Senior Energy Engineer*
>
>
>
>
>
> 134 South Fitzhugh Street                 Rochester, NY 14608
>
> *T: (585) 698-1956 <(585)%20698-1956>*                        F: (585)
> 325-6005
>
> bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
> www.pathfinder-ea.com
>
> [image: http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon
> Fee and Dividend - simple, effective, and market-based.
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Brad Painting via Equest-users
> *Sent:* Thursday, January 05, 2017 9:02 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Boiler Curves in Library
>
>
>
> Can someone direct me to where I can find an explanation of how the
> part-load boiler curves were developed? I can find the formula coefficients
> for the heat-input ratio in the BDLLIB.dat file and an explanation of how
> to apply them in the DOE2 Engineer’s Manual. But how were the formulas and
> coefficients developed? Are they based on some study results described
> somewhere in the documentation? I am seeing very little part-load
> degradation in performance using the forced draft curve and I was wondering
> why. Thanks.
>
>
>
> Brad Painting
>
> Facility Strategies Group, LLC
>
> 1012 Market Street, Suite 307
>
> Fort Mill, SC 29708
>
> Phone: (803) 493-9706
>
>
>
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