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<p class="MsoNormal">I’m might not phrase that the Thermostatic option is more “representative,” but perhaps this more commonly reflects new construction/design, in some regions/localities. Fundamentally, Thermostatic means that the application/delivery of
baseboard heat is dependent on a thermostat somewhere within the zone. In real world terms this may be an independent thermostat on the wall, or else tied to a thermostat also signaling with a fan-driven heating source. I might say this behavior of tying
local heat deliver to local conditions is perhaps more intuitive, and therefore more likely “representative” of what many modelers would want to see if they had no designed system/sequence to reference. OA Reset however isn’t really uncommon, and I would
say is typically the most accurate option for existing/aged perimeter heating systems I’m typically modeling from around the midwest (USA). OA Reset allows you to, with a schedule, either define a hard “snap” of heating availability based on an outdoor temperature
threshold, schedule that availability based on the calendar/season, and/or allow for a linear application of heat between a range of temperatures. A common inference is that there is NO thermostat in the zone limiting or causing the application of heat, so
inherently you have more potential to introduce unmet hours as zones on the same heating loop have unique special snowflake needs hour over hour... however this is reality for many buildings. Baseboard heating loop/operation instead determined/scheduled by
manual operation or within a BAS. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">By observing no change in the outcome after switching to thermostatic, you’ve verified the issue isn’t rooted in your scheduling efforts so I’d switch back for now. I would intutivelly look next to other inputs that could lock out operations
of the baseboards – namely operations for the associated boiler(s) / loop(s) which could have stuff like snap schedules or other inputs preventing the delivery of heat to the baseboards… but it appears you may have already done that.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For clarity, I think you might have developed a more difficult set of questions for yourself by asserting “Ventilation Loads + Baseboard Heat Delivery = 100% of all heating.” This would infer that your central heating coils have zero potential
contributions anytime the OA dampers are shut… i.e. Return Air is always a comfortable 70 degrees. There are likely some skin loads and infiltration loads that the perimeter baseboards are not directly handling. If your ultimate goal is to isolate your ventilation
heating loads, you might more simply make a copy of your model (after resolving the baseboard heat delivery situation and any other edits you want to make), then zero out all ventilation delivery in the copy (remove zonal OA inputs and set the AHU’s to a fixed
fraction of zero). Simulate and now you have all “non-ventilation loads” to compare / difference against your normal model’s heating loads.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There are probably better ways, and I know eQuest 3.65 (in doe2.3 mode) has some new/enhanced systems load reporting I haven’t fully explored, but that’s an approach I’ve used in past years for similar ends.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#3A7A46"><img width="624" height="8" style="width:6.5in;height:.0833in" id="_x0000_i1031" src="cid:image001.jpg@01D5F91B.C92DE8C0"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:4.5pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">913 . 564 . 6361<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">785 . 410 . 3317<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"><a href="mailto:nicholas.caton@se.com"><span style="font-family:"Calibri",sans-serif;color:#626469">nicholas.caton@se.com</span></a></span></u><span style="font-size:9.0pt;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Burger, Scott via Equest-users<br>
<b>Sent:</b> Thursday, March 12, 2020 9:25 AM<br>
<b>To:</b> Brian Fountain <Brian.Fountain@sa-footprint.com><br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Baseboard/Fin Tube Coil Loads<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Brian,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I appreciate the quick response and your initial insights.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3">I tried adjusting the control method to “Thermostatic”, but unfortunately that did not alleviate my issue. I previously defined baseboard heating capacities manually per zone, but
I’ll have to be cognizant of those capacities if I leave it as Thermostatic. In your opinion, why do you indicate that Thermostatic is more representative that OA Reset?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3">Oddly, changing the baseboard heating source to electric and returning the baseboard loop source to default (aka removing it’s attachment to the HW loop), now shows baseboard loads
all throughout the day. That indicates to me that there is an issue on the Water-Side that is preventing the baseboards at the zone level from operating between 1 AM and 6 AM. Any thoughts on typical water-side issues that would lead to this discrepancy (ie.
loop/boiler schedules, baseboards attached to primary vs. secondary HW loops, etc.)? Since the baseboards show loads from 7 AM and on, my gut tells me that it indicates more of a scheduling issue than anything else, but frankly I’m baffled as to how the schedules
are precluding those hours based on what I see.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Scott Burger BEAP
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#C3D200">Be green, leave it on the screen.
<o:p></o:p></span></b></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Brian Fountain <<a href="mailto:Brian.Fountain@sa-footprint.com">Brian.Fountain@sa-footprint.com</a>>
<br>
<b>Sent:</b> Thursday, March 12, 2020 9:44 AM<br>
<b>To:</b> Burger, Scott <<a href="mailto:Scott.Burger@arcadis.com">Scott.Burger@arcadis.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: Baseboard/Fin Tube Coil Loads<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Scott,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">A couple of quick observations:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:#1F497D;margin-left:0in;mso-list:l1 level1 lfo6">
While “OA Reset” is the default control mode for baseboard heating, I’d suggest that “Thermostatic” is more representative unless you specifically have a reason for applying a schedule to your baseboard heating. That change may resolve your issue.<o:p></o:p></li><li class="MsoListParagraph" style="color:#1F497D;margin-left:0in;mso-list:l1 level1 lfo6">
Baseboard heating is applied first before zonal heating – so size your baseboard heating carefully<o:p></o:p></li><li class="MsoListParagraph" style="color:#1F497D;margin-left:0in;mso-list:l1 level1 lfo6">
Baseboard heating is not autosized unless you are using DOE-2.3 so you will have to explicitly determine the baseboard heating capacities in the zones.<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Beyond that you may wish to share the .inp and .pd2
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:105%"><b><span style="font-size:12.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006298">Footprint<br>
<br>
</span></b><b><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006298">Brian Fountain<br>
</span></b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#3D3935">Associate<br>
</span><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892">d
</span></b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#3D3935">416 572 8501</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006892"> m
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#3D3935">416 562 6831<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Burger, Scott via Equest-users<br>
<b>Sent:</b> March 12, 2020 9:32 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Baseboard/Fin Tube Coil Loads<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">CAUTION: EXTERNAL SENDER
<o:p></o:p></span></p>
<div>
<p class="MsoNormal">Dear eQuest users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m a novice eQuest user who is looking for some help regarding a project. I’ve used these forums to help gain knowledge of the program and how to make sense of it for my own work; however, the learning curve has been steep.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I developed a model for an existing building in conjunction with an onsite energy audit. In addition to completing an energy analysis and simulation, we are required to develop peak hourly heating and cooling loads for potential design
of a GSHP system. The building uses 5 AHUs each with chilled water coils for cooling and hot water coils for heating. Additionally, there are fin tube radiators around most of the perimeter of the building. My goal is to disaggregate the ventilation portion
of the peak heating load from the baseboard portion of the peak heating load. My research online and combing of forums indicates that disaggregating ventilation loads using eQuest is not a simple process. My initial thought was that if I can determine my hourly
baseboard heating loads, I can estimate that the ventilation load accounts for the rest of the building’s hourly heating load. However, after running an hourly simulation, I noticed that the heating coil load on the CIRCULATION-LOOPs that serve the fin-tube
radiators show 0s from 1 AM – 6 AM. To verify this, I added “Zones” into my hourly simulation and noticed the same issue—0 “Baseboard heat output to zone (Btu/hr)” during hours from 1 AM – 6 AM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On the Air-Side, the baseboards are controlled via “Outdoor Reset”, and I verified that the reset schedule at the system level wouldn’t preclude the baseboards from running during those hours. On the Water-Side, I verified that the boiler
is in operation during those hours via a boiler schedule and that the actual HW loop serving the baseboards is in operation during those hours via a baseboard loop schedule as well. Based on the OA temp and the zone temperature (which is below the heating
throttling range), the fin tube radiators should be operating per the model (and that’s also how they operate the building in real life, as well).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve seen the folks on this board provide some excellent advice and insight to other posters, so I hope you can do the same for me here! I’d appreciate if anyone can provide some insight as to why they think the fin tube radiators are showing
0 between 1 AM and 6 AM but seem to operate fine during the rest of the day. If you have any questions about the model or need more information, I am more than happy to oblige.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Scott Burger BEAP
</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">| Energy Engineer |
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><a href="mailto:scott.burger@arcadis.com"><span style="color:#7FBDCF">scott.burger@arcadis.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Arcadis
<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">T. +1 518 250 7261 | F. 518 371 2757<o:p></o:p></span></p>
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<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#C3D200">Be green, leave it on the screen.
<o:p></o:p></span></b></p>
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