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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This is a great question that has puzzled me in the past.<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">The difference between the hourly reports BUILDING-LOADS and BUILDING-HVAC is the same as the difference between the heating and cooling reported in the LS- reports
(LS-C for peak and LS-F for total) and the heating and cooling reported in SS-D.
<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">LS- reports and BUILDING-LOADS are determined after the LOADS module is run. SS- reports and BUILDING-HVAC are determined after the SYSTEM/PLANT module is run.
<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">You are correct that the biggest difference is generally caused by ventilation. There are a number of other factors that move the SYSTEMS heating and cooling
energy. <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">Reheat – reheat is not accounted for in LOADS but comes into play in SYSTEMS. With a VAV system and a low supply air temperature you will see an increase in
heating energy between your LOADS and SYSTEMS reports even without ventilation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Humidity control – while LOADS reports latent loads, SYSTEMS reports the system response including reduced supply air temperature and reheat.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thermostat setpoints – SYSTEMS uses the zone thermostats whereas in LOADS the space temperature estimate is used to determine loads for all hours. This can
have a significant impact on unconditioned spaces where the default SPACE temperature is 70F for LOADS but may vary considerably from this in the SYSTEMS module.<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">Mohamed provided a much more comprehensive list of the differences between the LOADS and SYSTEM runs – I am very curious about the source of that list?<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"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:8.0pt;line-height:106%"><b><span style="line-height:106%;font-family:"Arial",sans-serif;color:#006298">Footprint<br>
<br>
</span></b><b><span style="font-size:10.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#006298">Brian Fountain<br>
</span></b><span style="font-size:9.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#3D3935">Associate<br>
</span><b><span style="font-size:9.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#006892">d
</span></b><span style="font-size:9.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#3D3935">416 572 8501</span><span style="font-size:9.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#006892"> m
</span><span style="font-size:9.0pt;line-height:106%;font-family:"Arial",sans-serif;color:#3D3935">416 562 6831<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><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"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Konstantina Kalliakoudi via Equest-users<br>
<b>Sent:</b> March 11, 2020 3:49 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Difference between "Building -Loads" and "Building -HAVC"<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">CAUTION: EXTERNAL SENDER <o:p></o:p></p>
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<p class="MsoNormal"><img width="542" height="338" style="width:5.6458in;height:3.5208in" id="_x0000_i1025" src="cid:image002.png@01D5F777.7A3EC2C0" alt="image.png"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear equest users,<o:p></o:p></p>
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<p class="MsoNormal">I generated hourly report blocks looking for the loads.<o:p></o:p></p>
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<p class="MsoNormal">I saw that there are two options:<o:p></o:p></p>
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<p class="MsoNormal">1. "Building Loads" which as far I understood contains losses, gains etc....<o:p></o:p></p>
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<p class="MsoNormal">2. "Building - HVAC" - Coils - losses&gains at te beginning I believed that it cantrained : The Loads from the fresh air + "Building Loads". So in order to test that I made zero the fresh air at my AHUs. I was expecting that now the
"Building - HVAC" would be equal with "Building Loads". But still there is a difference. "Building - HVAC" is higher almost 50% than "Building 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">Any Ideas or Comments about what "Building - HVAC" contains more than "Building 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">Thank you for your help<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-size:11.0pt;font-family:"Calibri",sans-serif">Konstantina Kalliakoudi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Mechanical Engineer,M.Sc., LEED AP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">KHM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Filolaou 28, Ilioupoli, Athens, Greece<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Tel. 0030 210 99 69 680<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="http://www.khmoe.gr"><span style="color:#0563C1">www.khmoe.gr</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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