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(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 class="moz-txt-link-rfc2396E" href="mailto:YJHuang@whiteboxtechnologies.com"><YJHuang@whiteboxtechnologies.com></a><br>
Reply-To: <a class="moz-txt-link-abbreviated" href="mailto:EnergyPlus_Support@yahoogroups.com">EnergyPlus_Support@yahoogroups.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:EnergyPlus_Support@yahoogroups.com">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 class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<br>
On 2/13/2014 9:06 AM, Simge Andolsun wrote:
<blockquote
cite="mid:CAHm8iRNX5-a5L8ZB=+=rzxT2oHxsrruhJrRmXEk70c930KZ5YA@mail.gmail.com"
type="cite">
<div dir="ltr"><font color="#000000" face="Times New Roman"
size="3">
</font>
<p style="background: none repeat scroll 0% 0% white;"><span
style="color: black; 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: none repeat scroll 0% 0% white; margin:
5pt 0in 6pt 0.5in;"><span style="color: black; font-family:
Symbol;"><span><font size="3">·</font><span style="font: 7pt
"Times New Roman";">
</span></span></span><span style="color: black;
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: none repeat scroll 0% 0% white; margin:
5pt 0in 6pt 0.5in;"><span style="color: black; font-family:
Symbol;"><span><font size="3">·</font><span style="font: 7pt
"Times New Roman";"> </span></span></span><span
style="color: black; 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: none repeat scroll 0% 0% white;
margin-left: 0.5in;"><span style="color: black; font-family:
Symbol;"><span><font size="3">·</font><span style="font: 7pt
"Times New Roman";">
</span></span></span><span style="color: black;
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: none repeat scroll 0% 0% white; margin:
0in 0in 0pt; text-indent: 0.5in;"><span style="color: black;
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: none repeat scroll 0% 0% white; margin:
0in 0in 0pt; text-indent: 0.5in;"><span style="color: black;
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: none repeat scroll 0% 0% white; margin:
0in 0in 0pt; text-indent: 0.5in;"><span style="color: black;
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: none repeat scroll 0% 0% white;"><span
style="color: black; 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>
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