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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks for the feedback everyone. I am comparing some of the information in the PG&E study with the algorithms described in the DOE2 Engineer’s manual. I am confused about
how the MIN-RATIO variable is used. It seems like the engineer’s manual states that the equipment only cycles on/off when the load drops below MIN-RATIO, but it also states that the part load performance curves account for cycling (pg. v.10):<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">For a single stage boiler then, what is the MIN-RATIO doing if all of the part load performance is already attributed to cycling?
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The graph of “Unit 1” performance in the PG&E study (pg. 40) closely matches the performance curve from the Atmospheric-Blr-HIR-fPLR curve in the library. “Unit 1” is a single
stage boiler, so all part load performance would occur from cycling. What would the best curve be to simulate the part load performance of a modulating non-condensing boiler?<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> erik.kolderup@gmail.com [mailto:erik.kolderup@gmail.com]
<b>On Behalf Of </b>Erik Kolderup<br>
<b>Sent:</b> Thursday, January 05, 2017 1:15 PM<br>
<b>To:</b> Brad Painting <Bpainting@fstrategies.com>; equest-users <equest-users@lists.onebuilding.org><br>
<b>Subject:</b> Re: [Equest-users] Boiler Curves in Library<o:p></o:p></span></p>
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<p class="MsoNormal">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: <a href="http://www.etcc-ca.com/sites/default/files/OLD/images/boiler_research_project_-_ats-te_final_report_pcb_05092012.pdf">http://www.etcc-ca.com/sites/default/files/OLD/images/boiler_research_project_-_ats-te_final_report_pcb_05092012.pdf</a>. <o:p></o:p></p>
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<p class="MsoNormal">-Erik<o:p></o:p></p>
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<p class="MsoNormal"><b>Erik Kolderup, PE, LEED AP</b><o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:erik@kolderupconsulting.com" target="_blank">erik@kolderupconsulting.com</a><span style="color:#999999"> | 415.531.5198 | </span><a href="http://www.kolderupconsulting.com" target="_blank">www.kolderupconsulting.com</a><span style="color:#999999"> </span><o:p></o:p></p>
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<p class="MsoNormal">On Thu, Jan 5, 2017 at 9:39 AM, Bishop, Bill via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Hi Brad,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">I don’t know how the default boiler curves were developed, but…</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">It is easy enough to create custom curves based on manufacturer performance data, which is available for many boiler models.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">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.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">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.</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">~Bill</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Brad Painting via Equest-users<br>
<b>Sent:</b> Thursday, January 05, 2017 9:02 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Boiler Curves in Library<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Brad Painting<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Facility Strategies Group, LLC<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">1012 Market Street, Suite 307<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Fort Mill, SC 29708<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Phone:
<a href="tel:(803)%20493-9706" target="_blank">(803) 493-9706</a><o:p></o:p></p>
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