<div dir="ltr">or simply eQUEST might be calculating more than zero loads during these night hours whereas EnergyPlus calculates zero load...</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 13, 2014 at 3:50 PM, Simge Andolsun <span dir="ltr"><<a href="mailto:simgeandolsun@gmail.com" target="_blank">simgeandolsun@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Joe hi!</div><div> </div><div>I tried that one. Nothing changed in fan energy consumption between cycling and continuous. I feel like eQUEST has a default fan control for PTAC (which is continuous) and uses it no matter what.</div>

<div> </div><div> </div><div>Thanks,</div><div><div>Best Regards,</div><div>Simge Andolsun, Ph.D.</div></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 13, 2014 at 3:27 PM, Joe Huang <span dir="ltr"><<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>></span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><u></u>

  
    
    
  
  <div bgcolor="#ffffff" text="#000000">
    Simge,<br>
    <br>
    You might want to try (in eQUEST/DOE-2)  FAN-CONTROL = CYCLING
    instead of FAN-CONTROL = CONSTANT-VOLUME <br><div>
    <br>
    Joe<br>
    <pre cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>
<a href="http://weather.whiteboxtechnologies.com" target="_blank">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) <a href="tel:%28925%29388-0265" target="_blank" value="+19253880265">(925)388-0265</a>
(c) <a href="tel:%28510%29928-2683" target="_blank" value="+15109282683">(510)928-2683</a>
"building energy simulations at your fingertips"
</pre>
    <br></div><div><div>
    On 2/13/2014 1:15 PM, Simge Andolsun wrote:
    <blockquote type="cite">
      <div dir="ltr">
        <div>Joe hi!</div>
        <div> </div>
        <div>Thanks for your response. I had autosized the systems in
          both programs. Since the loads were different, then the air
          flow rates ended up being different. Based on your comments, I
          entered the air flow rate calculated by eQUEST into
          EnergyPlus. I also added the Daylight saving time of eQUEST
          into EnergyPlus. Attached is how my charts currently look
          like. I am also attaching the new EnergyPlus file. Most of the
          problems seem to have been resolved except the night time
          control. I would appreciate any suggestion on solving this
          discrepancy between the two models.</div>
        <div> </div>
        <div>Thank you very much in advance,</div>
        <div>Best Regards,</div>
        <div>Simge Andolsun, Ph.D.</div>
      </div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">On Thu, Feb 13, 2014 at 1:40 PM, Joe
          Huang <span dir="ltr"><<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
            <div bgcolor="#ffffff" text="#000000"> (repost of comment on
              EnergyPlus_Support bulletin board in case any eQUEST-Users
              readers have other thoughts or corrections)<br>
              <br>
              -------- Original Message --------<br>
              Subject:     Re: [EnergyPlus_Support] eQUEST vs
              EnergyPlus: Fan Energy Consumption<br>
              Date:     Thu, 13 Feb 2014 11:32:17 -0800<br>
              From:     Joe Huang <a href="mailto:YJHuang@whiteboxtechnologies.com" target="_blank"><YJHuang@whiteboxtechnologies.com></a><br>
              Reply-To:     <a href="mailto:EnergyPlus_Support@yahoogroups.com" target="_blank">EnergyPlus_Support@yahoogroups.com</a><br>
              To:     <a href="mailto:EnergyPlus_Support@yahoogroups.com" target="_blank">EnergyPlus_Support@yahoogroups.com</a><br>
              <br>
              Simge,<br>
              <br>
              Looking at your plots, it seems that the eQUEST fan is
              simply larger by 40% or so.  Are you letting the programs
              autosize the equipment, and did you use any
              sizing-factors  or sizing-ratios in the runs?  I would
              just take the larger<br>
              capacity of the two runs, and use that for both runs,
              which should take care of the discrepancy.<br>
              <br>
              Other observations:<br>
              1. eQUEST CYCLE-ON-ANY seems to keep the fans on the
              entire hour, whereas EnergyPlus seems to cycling them on<br>
                  only when the HVAC is on.<br>
              <br>
              2. You seem to have daylight savings in the eQUEST, but
              not in the EnergyPlus model.<br>
              <br>
              Joe<br>
               <br>
              <pre cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>
<a href="http://weather.whiteboxtechnologies.com" target="_blank">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) <a href="tel:%28925%29388-0265" target="_blank" value="+19253880265">(925)388-0265</a>
(c) <a href="tel:%28510%29928-2683" target="_blank" value="+15109282683">(510)928-2683</a>
"building energy simulations at your fingertips"
</pre>
              <div>
                <div> <br>
                  On 2/13/2014 9:06 AM, Simge Andolsun wrote: </div>
              </div>
              <blockquote type="cite">
                <div>
                  <div>
                    <div dir="ltr"><font color="#000000" face="Times New
                        Roman" size="3"> </font>
                      <p style="background:white"><span style="font-family:"Helvetica","sans-serif""><font size="3">Dear EnergyPlus users,<br>
                            <br>
                            We have modeled a test case with exactly
                            same inputs in eQUEST and EnergyPlus to
                            compare the results of these programs for an
                            identical situation. This case had a PTAC
                            system with electric heating. The fan inputs
                            were as follows in both eQUEST and
                            EnergyPlus:</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin:5pt 0in 6pt 0.5in"><span style="font-family:Symbol"><span><font size="3">·</font><span style="font:7pt/normal "Times New Roman";font-size-adjust:none;font-stretch:normal">         </span></span></span><span style="font-family:"Helvetica","sans-serif""><font size="3">0.3 inWG (74.7 Pa), 0.6 total
                            efficiency fraction</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin:5pt 0in 6pt 0.5in"><span style="font-family:Symbol"><span><font size="3">·</font><span style="font:7pt/normal "Times New Roman";font-size-adjust:none;font-stretch:normal">       </span></span></span><span style="font-family:"Helvetica","sans-serif""><font size="3">In eQUEST: Fan control is constant
                            volume, with night time cycling<br>
                            In EnergyPlus: Fan control is constant
                            volume (fan control schedule=1) when the
                            fans are scheduled to be on and it is
                            cycling (fan control schedule=0) when the
                            fans are scheduled to be off. I used
                            AvailabilityManager:NightCycle to set this
                            control (Please let me know whether there is
                            any better way to model the same fan control
                            condition in eQUEST and EnergyPlus).</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin-left:0.5in"><span style="font-family:Symbol"><span><font size="3">·</font><span style="font:7pt/normal "Times New Roman";font-size-adjust:none;font-stretch:normal">         </span></span></span><span style="font-family:"Helvetica","sans-serif""><font size="3">California Title 24 fan
                            availability schedules were used in both
                            programs. These schedules turn the fan off
                            during the hours listed below:</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin:0in 0in 0pt;text-indent:0.5in"><span style="font-family:"Helvetica","sans-serif""><font size="3">Weekdays: Between 8pm-5am</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin:0in 0in 0pt;text-indent:0.5in"><span style="font-family:"Helvetica","sans-serif""><font size="3">Saturday: Between 3pm-5am</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white;margin:0in 0in 0pt;text-indent:0.5in"><span style="font-family:"Helvetica","sans-serif""><font size="3">Sundays and Holidays: Off all day.</font></span></p>


                      <font color="#000000" face="Times New Roman" size="3"> </font>
                      <p style="background:white"><span style="font-family:"Helvetica","sans-serif""><font size="3">The fan energy consumption of the
                            two programs ended up differing from each
                            other significantly. Attached are the charts
                            that show the results of the coldest and
                            warmest days. Would you let me know what
                            might be the reason for this difference
                            between the two programs? <br>
                            <br>
                            Thank you very much in advance for your
                            help,<br>
                            Best Regards,<br>
                            S. Andolsun, Ph.D.</font></span></p>
                      <font color="#000000" face="Times New Roman" size="3"> </font></div>
                  </div>
                </div>
                <pre><fieldset></fieldset>
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              </blockquote>
            </div>
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            <br>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
  </div></div></div>

</blockquote></div><br></div>
</div></div></blockquote></div><br></div>