<div dir="ltr">Vikram,<div><br></div><div>The original file you posted had constant 55F supply air temperature. So combined with constant airflow it was driving the zone to the heating setpoint. </div><div><br></div><div>If the supply air temperature control is changed to "warmest" then the space temperature will vary a bit, moving between the heating and cooling setpoints. I haven't looked closely at your model and I'm not sure what climate you're modeling, but it wouldn't be unusual to be at the cooling setpoint at times in the winter. The space should be in cooling mode whenever the outdoor temperature is above the balance point temperature. I would expect it to be at the heating setpoint only when either the outdoor air temperature is below the balance point or if the combination of supply air temperature and minimum airflow is overcooling the zone. </div><div><br></div><div>I often find it useful to report the supply air temperature as an hourly variable to check that DOE2 is doing what I expect. </div><div><br></div><div>-Erik </div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><b>Erik Kolderup, PE, LEED AP</b><div><a href="mailto:erik@kolderupconsulting.com" target="_blank">erik@kolderupconsulting.com</a><span style="color:rgb(153,153,153)"> | 415.531.5198 | </span><a href="http://www.kolderupconsulting.com" target="_blank">www.kolderupconsulting.com</a><span style="color:rgb(153,153,153)"> </span><br></div></div></div></div>
<br><div class="gmail_quote">On Tue, May 19, 2015 at 4:30 PM, Sami, Vikram <span dir="ltr"><<a href="mailto:vikram.sami@zgf.com" target="_blank">vikram.sami@zgf.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks Erik.
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Now what if it’s a scenario where the room has a minimum airflow requirement (like a lab or an operating room)? I would have thought resetting the supply air
temp would settle the issue. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Also - when I reduce the airflow rates, it still doesn’t behave well – I get cooling temperature setpoints in the winter.
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<p class="MsoNormal" style="line-height:12.0pt"><b><span style="font-size:9.0pt;font-family:"Futura LT Book";color:#e33b45">Vikram Sami</span></b><span style="color:#1f497d"><br>
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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">
<a href="mailto:erik.kolderup@gmail.com" target="_blank">erik.kolderup@gmail.com</a> [<a href="mailto:erik.kolderup@gmail.com" target="_blank">mailto:erik.kolderup@gmail.com</a>]
<b>On Behalf Of </b>Erik Kolderup<br>
<b>Sent:</b> Monday, May 18, 2015 5:06 PM<br>
<b>To:</b> Sami, Vikram<br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Thermostat setpoint quandry<u></u><u></u></span></p>
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<p class="MsoNormal">Vikram,<u></u><u></u></p>
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<p class="MsoNormal">I suggest checking your minimum airflow schedule ("Annual Schedule Airflow"). Looks like the values are greater than one, resulting in a constant volume system that gets driven to the heating setpoint. If the airflow were allowed to drop
then there would probably be hours at the cooling setpoint. <u></u><u></u></p>
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<p class="MsoNormal">Regards,<u></u><u></u></p>
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<p class="MsoNormal">Erik<u></u><u></u></p>
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<p class="MsoNormal"><b>Erik Kolderup, PE, LEED AP</b><u></u><u></u></p>
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<p class="MsoNormal"><a href="mailto:erik@kolderupconsulting.com" target="_blank">erik@kolderupconsulting.com</a><span style="color:#999999"> | <a href="tel:415.531.5198" value="+14155315198" target="_blank">415.531.5198</a> | </span><a href="http://www.kolderupconsulting.com" target="_blank">www.kolderupconsulting.com</a><span style="color:#999999"> </span><u></u><u></u></p>
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<p class="MsoNormal">On Mon, May 18, 2015 at 3:51 PM, Sami, Vikram <<a href="mailto:vikram.sami@zgf.com" target="_blank">vikram.sami@zgf.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">I’m a little stumped here.
<u></u><u></u></p>
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<p class="MsoNormal">I’m running a simple single zone VAV simulation that has a setback temperature schedule for heating and cooling seasons. For some reason, if you examine the hourly report, it seems
to use the heating schedule for the entire year (inp file attached).What am I missing?
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<p class="MsoNormal">Any insight would be much appreciated.
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