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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The system as Adam described it appears to be (mostly) constant-volume,
variable-temperature. If there are no VAV boxes and the supply fan VFD is
controlled by building pressure, then it sounds like it is supposed to be a
safety back-up for the relief system. If the relief system is properly
designed and balanced, I don’t see the supply volume fluctuating much.
I also don’t see it fluctuating in the model if the Min Flow Ratio is left
at 1.0. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The unmet hours are out of control because of the factors listed
below.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The issue John and Demba raised of an 80 F heating supply
temperature.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>On top of a low heating supply temperature and no reheat, there
are no baseboards or other forms of zone-level heat for RTU-4, 3, and 2. However,
RTU-1 has them…?<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It is extremely difficult for a single-zone system to satisfy 19
separate zones (RTU-4). It is impossible for a single-zone system to do
so if there is no zone-level heating.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Using an interior control zone that appears to be a 175 sqft
storage room (RTU-1). This control zone is adjacent to “walking
cooler”, which has a connected internal load of 57 kW (34.2 kW peak
demand), 1.0 sensible heat ratio, and is 170 sqft. A walk-in cooler
rejects heat outside the building, so the sensible heat ratio should be zero.
The control zone is also adjacent to the kitchen with 21.13 kW of connected electric
power and 862 kBTH of connected gas load, both of which have sensible ratios of
1.0. This heat is having a huge influence on the control zone, which is
why it is constantly in cooling mode while the rest of the zones are in heating
mode. <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Not having a morning warm-up schedule<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Allowing eQUEST to allocate supply air to the zones –
entering design flow rates (supply, exhaust, and OA) at the zone level ensures
each zone is getting the airflow it was designed for.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I changed the system type for the four RTUs to be PVVT with the heating
supply capped at 80 F, and I was at least able to get the control zones
satisfied. I would recommend discussing the design with the mechanical
engineer to ensure it is properly represented in the model. The diversity
of space needs and building orientation does not appear to be well-suited for
single-zone control.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<div>
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</span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><b><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>DAKOTA KELLEY </span></b><b><span style='color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>Project Designer | Energy Analyst<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>
</span><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>Office: 214.744.6199 <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>
Cell: 214.280.3825<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>
Fax: 214.744.0770</span><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'> </span><span style='font-size:10.0pt;
font-family:"Franklin Gothic Book","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'><a href="http://www.teliospc.com/"><span style='color:blue'>http://www.teliospc.com
</span></a> 3535 Travis St.
Suite 115<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'><a href="mailto:dakotak@teliospc.com"><span style='color:blue'>dakotak@teliospc.com</span></a></span><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'> </span><span
style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'>Dallas, TX 75204</span><span style='font-size:10.0pt;font-family:
"Franklin Gothic Book","sans-serif";color:black'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:black'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
color:#3333FF'>| MEP ENGINEERING · ENERGY MODELING · LEED
CONSULTATION · COMMISSIONING |</span><span style='font-size:8.0pt;
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> vidya gowda
[mailto:vidyacg@vt.edu] <br>
<b>Sent:</b> Thursday, July 29, 2010 4:32 PM<br>
<b>To:</b> John Aulbach<br>
<b>Cc:</b> equest-users@lists.onebuilding.org; Vidya Gowda;
bldg-sim@lists.onebuilding.org; Adam Gonthier<br>
<b>Subject:</b> Re: [Equest-users] PSZ Very High Unmet Hours<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Dear John,
</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Have
posted the proposed and the baseline case model on behalf of Adam, also
responding to your query about VFD, about varying the flows, do we need to
model a vav system?.. or I am not very familiar with this part as the specs
don’t show VAV terminal units, they have provided the VFD schedules. It
would really help if you could let us know how to to rectify the error. I also
went ahead and changed the hot deck temperature to default as suggested by you
and Demba. But it doesn’t seem to help much </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Thanks for
responding, </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Kind
Regards, </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Vidya</span><o:p></o:p></p>
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