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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Almost all boilers modulate to prevent overheating. There is some minimum turndown and at that point the boiler would cycle. Fuel use of a boiler is generally
linear if you exclude jacket losses radiated off the boiler.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Fuel use of a boiler that cycles at 50% load for 20% time (0.5 x 0.2 = 10%) = Fuel use of boiler that runs continuously at 10% load. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Even if Trace is “wrong” the result is the same. One item to check is “Miscellaneous Accessories” for the boiler which may be constant energy use when boiler
is running (e.g. make-up water pump, combustion fan, controls, fuel oil pump, etc). Compare these in the baseline and proposed since they may create an artificial benefit or penalty to heating plant energy use.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">HW pump modulating versus constant speed riding the pump curve is where you will see part load energy savings on the heating system. For LEED (90.1-2007), the
baseline HW pump must have a variable speed drive if building is 120,000 SF or more.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Scott<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"> Trace-users [mailto:trace-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Jason Dietterick<br>
<b>Sent:</b> Wednesday, August 12, 2015 12:15 PM<br>
<b>To:</b> trace-users@lists.onebuilding.org<br>
<b>Subject:</b> [Trace-users] Baseline equipment modulation control<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm having some trouble interpreting what is required in regards to modulation w/ heating and cooling equipment. I have always trusted the curves in the Trace ASHRAE library members however, I have recently seen some conflicting documentation
and model reports that are confusing me. Per Trace curves, all equipment is inherently capable of modulation. At 100% load, a boiler consumes 100% of the power and at 1% load a boiler consumes 1% of the power. It seems like Trace has this wrong.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The only thing I have been able to find in ASHRAE refers to cooling part-load efficiencies, and states that minimum efficiency requirements need only be adhered to if the compressors are capable of modulation. However, there is nothing
that defines whether or not compressors should be modulating, so it would appear that the baseline is on/off. There are no specifics outlines in regards to boiler/furnace modulation that I have been able to find either. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can you tell me in your experience, what the requirements are for baseline equipment modulation for all equipments types? And does Trace really have this wrong with all their ASHRAE library members or am I missing something?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Jason<br clear="all">
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#500050"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:#001E5E">Jason Dietterick, CEM</span></b><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#001E5E">Associate</span><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:"Calibri",sans-serif;font-variant:small-caps;color:#003366">The Stone House Group</span><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#17365D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D">Suite 400<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D">301 Broadway </span><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D">Bethlehem<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#17365D"> ,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#17365D"> PA 18015</span><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#001E5E">tel. 610 868 9600 | dir. </span><span style="font-family:"Arial",sans-serif;color:black">484 548 4007<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#001E5E">fax 610 868 2272 </span><span style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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