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<p class="MsoNormal">Each time you simulate your model, the cooling needs for a given zone are calculated twice.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First, during the LOADS portion of the simulation: <o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The zonal inputs DESIGN-COOL-TEMP and DESIGN-HEAT-TEMP are used to estimate the “steady-state” exterior skin loads and intra-zonal loads between walls/floors/ceilings. When I say
“steady-state” I’m describing one or (typically, from wizard-bourne models) a series of calculations for load design conditions defined by your DESIGN-DAY inputs, as occurring.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">If you ever learned to do load calcs by hand/spreadsheet to determine loads present on a system before considering ventilation… this first part of the simulation is pretty analogous
to getting that far.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">These loads are used to help auto-size any systems for which you didn’t provide manual inputs for the heating/cooling/airflow capacity…<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Note that all of the SIM reports starting with “L” are reporting on loads determined during this first LOADS portion of the simulation<o:p></o:p></li></ul>
<p class="MsoNormal">Then, during the SYSTEMS portion of the simulation takes over. From here, the hourly (8760) simulation occurs that among others things, distinctly moves to
<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 lfo2">Consider heat transfer hour over hour (and the effects of thermal mass)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Consider the effects of SYSTEMS conditioning as well to determine the actual zone temperature each hour (now varying vs the “steady state” inputs used during the LOADS portion of the
simulation)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Layer in the effects of ventilation loads (including natural/window ventilation)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">DESIGN-COOL-TEMP and DESIGN-HEAT-TEMP are no longer used to assert or otherwise “bound/control” zone temperatures. During this portion of the simulation, zone temperature is calculated
independently, and the thermostat inputs/schedules (or lack thereof) are the primary means of defining system heating/cooling behavior.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There’s a lot more discussion in the mailing list archives if you are interested in further reading, but I’m hopeful this helps you understand better the contribution of those zonal DESIGN temp inputs in the scheme of things.<o:p></o:p></p>
<p class="MsoNormal"><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>
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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="Picture_x0020_1" src="cid:image002.jpg@01D6188A.B645CEB0"><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>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy Performance Contracting
</span><span style="font-size:9.0pt;color:#1F497D"><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:#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" align="right" style="text-align:right"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
<br>
</span><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>Konstantina Kalliakoudi via Equest-users<br>
<b>Sent:</b> Tuesday, April 21, 2020 7:01 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Question about Indoor Temperature<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="color:red">[External email: Use caution with links and attachments]</span><o:p></o:p></p>
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<p class="MsoNormal">Hello to all equest users,<o:p></o:p></p>
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<p class="MsoNormal">I have following question.<o:p></o:p></p>
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<p class="MsoNormal">At e-quest I give the specific Indoor Temperature<o:p></o:p></p>
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<p class="MsoNormal">via Cool Design Temperature = 75 F<o:p></o:p></p>
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<p class="MsoNormal">and Heating design Temperature = 70 F (for example)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In my building I have such a load from people that during the Winter (the heating period) I need cooling energy.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My question is how is this cooling energy calculated?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Based on which indoor temperature? The 70F or the 75F?<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 very much<o:p></o:p></p>
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<p class="MsoNormal">Konstantina Kalliakoudi<o:p></o:p></p>
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<p class="MsoNormal">Mechanical Engineer M.Sc.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:13.5pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#41424E">Απαλλαγμένο από ιούς.
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