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<p class="MsoNormal"><b>From:</b> Kathryn Kerns <br>
<b>Sent:</b> Monday, September 23, 2019 1:10 PM<br>
<b>To:</b> Equest-users <equest-users-bounces@lists.onebuilding.org><br>
<b>Cc:</b> Joshua Wood <joshua.wood@bceengineers.com><br>
<b>Subject:</b> Questions regarding Heating Coil sizing for 3.65.7175<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Everyone, I have been looking at the SV-A and SV-C reports for eQuest 3.65.7175 and I am confused. I have a zone with a typical PSZ furnace/DX with no reheat HVAC system related an auxiliary gym space.
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<p class="MsoNormal">The heating parameters are defined in the attached files called 218-112 Totem Base1 PSZ Furnace,DX, NoReheat Parameters and 218-112 Totem Base1 PSZ Furnace,DX, No Reheat HTG Parameters.
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<p class="MsoNormal">The resulting 218-112 Totem Base1 PSZ Furnace,DX, No Reheat SV-A & SV-C file (see attached) shows a Heating Furnace sized at 89.28 kbtu/hr using a 74.83 F EDB and a 90 F LDB. There is a heat exchanger present 0.5\0.5 Sensible\Latent. (see
218-112 Totem Base DOA SV-A attached)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The resulting 218-112 Totem Base1 PSZ Furnace,DX, No Reheat Airside HVAC Summary (see attached) shows a Heat Design Capacity of 58.0 Btu/sf. Multiply 58.0 by 3384 sf (area shown) = 196 kbtu/hr Design Capacity.
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There is a big difference between 82.28 kbtu/hr and 196 kbtu/hr. Curiously, the difference appears to be equal to the -107.03 kbtu/hr , the Zone ADDITION RATE shown in SV-A<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The questions are:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">What does the ADDITION RATE represent and why does it show up as ZONE HEATING value when ZONE HEATING is defined as “None”?
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">Why does the ADDITION RATE shown up in the Airside HVAC Summary as part to the Design Heating Capacity when the corresponding SV-A Furnace Size does not include this value?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">How is the Heating Furnace Design Capacity EDB\EWB temperature calculated? Is there a value that gets set in the input file somewhere? If so, where?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">Why does the Heating Furnace Design Day Peak occur on 4/8/8 in SV-C when the LS-A (see attached) shows a maximum load date of 11/29?<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">These are probably questions only the eQuest staff can answer. Does anyone know how to contact them?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Kathryn Kerns</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#1F497D">Systems Specialist</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;font-variant:small-caps;color:teal">BCE</span></b><b><span style="font-size:10.0pt;font-family:"Times New Roman",serif;font-variant:small-caps;color:teal">
</span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman",serif;font-variant:small-caps;color:teal">Engineers, Inc.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Times New Roman",serif;color:black">| Ph: 253.922.0446 | Fx: 253.922.0896 |</span></b><span style="font-size:7.0pt;font-family:"Times New Roman",serif;color:black">
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<p class="MsoNormal"><o:p> </o:p></p>
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