<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>
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