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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Amanda,<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 main problem is the mechanical penthouse where you’re supplying
at 70 F to maintain 90 F. The indoor sizing temp and hourly T-stat setting
were the same, which I admit sounds fine in theory. However, in terms of
eQUEST auto-sizing, the resulting airflow will just barely be enough – it will not
be sufficient during peak months as indicated by the high number of unmet load
hours (nearly all of which were occurring in July and August). The 1.25
cooling sizing ratio is for coil capacity, but that does not help in terms of
airflow, and insufficient airflow is nearly always the cause of unmet loads (I
have discussed the opposing nature of sections G3.1.2.2 and G3.1.2.8 here: </span><a
href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-January/003024.html">http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-January/003024.html</a><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>). You’re
right that it’s usually a control issue, but this case is a little different because
your system is on 24/7 to maintain a constant temperature. This is why night
cycling did not make a difference. <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'>Before going further, it may be beneficial to take a look at
G3.1.1 exception b. I think the mechanical floor may qualify. However, the entire
baseline system does not appear to follow Table G3.1.1A; the inclusion of CHW
and steam meters implies a district thermal system. I’ll accept what I see at
face value without a deeper understanding of the design. However, as noted in
the bullets below, I believe you’re trying to model System 7.<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'>In the attached project I made the following changes to AHU-504,
the one serving the mechanical floor. Note that only the first two modifications
were necessary to eliminate all unmet cooling hours, the rest are simply to
incorporate different sections of Appx G:<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='margin-left:42.75pt;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'>Set indoor cooling design temp to 80F with 60F supply
temperature, but hourly T-stat setting was left at 90 F. You’ll note that this
increased the supply air CFM by about 13%. If 80F/60F is too far off from the
proposed design, try gradually increasing the design temp back up toward 90F
with the same delta T until the unmet hours start appearing again. If you’re
trying to maintain 90F, I would assume the proposed system was at least
designed with a little buffer, maybe 85F or something in that range. <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Set indoor heating design temp to 65 F and a Zone Entering Max
Supply Temp to 85F for the same reason as described above – you want at least a
few degrees buffer between the design temp and hourly T-stat temps. This introduces
65F unmet heating hours to EL3 South Perim Zn (G.S12), but I don’t think this
is a real zone unless the architect is into 87 SQFT triangular rooms. It
appears to be a byproduct of trying to achieve the 3<sup>rd</sup> floor’s
custom footprint. If you cleaned up the building geometry, these hours would go
away. To illustrate, I added two Air Walls to this zone with the proper
NEXT-TO spaces defined, and the unmet heating hours were eliminated. <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Changed the CHW and HW valves from three-way to two-way (the
building is small enough that the CHW & HW pumps should be riding their
curves per G.3.1.3.5 and G3.1.3.10, and the pumps were already set to one-speed).<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Set Max Cooling Reset Temp to 65F and Min Cooling Reset Temp to
60F (for a design supply of 60F) per G3.1.3.12. Originally it was set to a
Zone Entering Min Supply Temp of 70F and a Max Cooling Reset Temp of 50F, which
don’t agree with each other.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Ensured all conditioned zones under AHU-504 have a heating and
cooling schedule assigned, the same design temps, the same thermostat type, and
the same 6F throttling range. There was a mix of different conditions, which I
assume was a result of trying to address unmet hours.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Restored default under the Heating/Unitary Power/Furnace section
(there is no furnace). However, I was confused by the inclusion of HW coils in
the AHU and electric zone reheat. Is this supposed to be System 7 or System
8? The standard VAV terminal units and water-side configuration imply System 7,
so I set the Heat Source to “Not Installed” and the Zone Heat Source to “Hot
Water Loop”.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Set the Hot Water Loop operation to “Demand” (there’s nothing in
Appx G that says it must be on Demand, but Standby is not a realistic secondary
loop operation and a good LEED reviewer will call you on it)<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:42.75pt;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'>Reversed the high/low temps in schedule “Reset temp HWday” –
they were backwards from what G3.1.3.4 indicates.<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'>Try following the above on the other systems and see what it
does for your unmet hours. Let me know if you have any questions or concerns
about what I did.<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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color:black'><o:p> </o:p></span></p>
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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/">http://www.teliospc.com </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">dakotak@teliospc.com</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:
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<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";
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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>
<p class=MsoNormal style='margin-left:24.75pt'><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>
<div>
<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"'> Martz, Amanda
[mailto:amartz@klingstubbins.com] <br>
<b>Sent:</b> Wednesday, July 21, 2010 12:30 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Ashrae Baseline Model & Unmet loads<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
have reverse action set, a range of 6 degrees, night cycling set to “cycle on
any,” and a 20 degree delta T. You’re right, those usually do the trick, that’s
why I’m so stumped. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<div>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<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"'> Amber Welsh
[mailto:amber@timmonsdesigneng.com] <br>
<b>Sent:</b> Wednesday, July 21, 2010 1:28 PM<br>
<b>To:</b> Martz, Amanda<br>
<b>Subject:</b> RE: [Equest-users] Ashrae Baseline Model & Unmet loads</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Amanda,<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'>When I first had these problems it had to do with fan control
and night cycling. Make sure that your fans are cycling. Next,
check to make sure that you have a minimum delta T of 20 between room set point
and supply air temperature. These are the 2 biggest things affecting the
unmet hours.<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'>Amber<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>
<div>
<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Martz,
Amanda<br>
<b>Sent:</b> Wednesday, July 21, 2010 1:22 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Ashrae Baseline Model & Unmet loads<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
have several VAV units with reheat serving several zones in my Ashrae baseline
model. It is autosizing all of the capacities, so why would I have unmet loads?
I have cooling and heating set to size at 1.15 and 1.25 as Ashrae states, and I
have cooling control set to “warmest.” I’m sure it is a control issue, but I
can’t figure out what exactly it is. I attached my model, any help would be
very greatly appreciated!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='line-height:15.0pt'><span style='font-size:8.0pt;
font-family:"Arial Black","sans-serif"'>Amanda E. Martz, EIT, LEED AP</span><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt;line-height:15.0pt'><span
style='font-size:8.0pt;font-family:"Arial Black","sans-serif"'>Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal style='line-height:15.0pt'><span style='font-size:8.0pt;
font-family:"Arial Black","sans-serif";color:black'>KlingStubbins</span><o:p></o:p></p>
<p class=MsoNormal style='line-height:15.0pt'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>2301 Chestnut Street</span><br>
<span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>Philadelphia,
Pennsylvania</span><br>
<span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>19103<o:p></o:p></span></p>
<p class=MsoNormal style='line-height:15.0pt'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>P 215.569.2900, ext. 3612</span><o:p></o:p></p>
<p class=MsoNormal style='line-height:15.0pt'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>F 215.569.5963<br>
E <a href="mailto:amartz@klingstubbins.com">amartz@klingstubbins.com</a> <br>
W <a href="http://www.klingstubbins.com/">www.klingstubbins.com</a></span><o:p></o:p></p>
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