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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hey Hwakong,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks for the response…. I realized the hard way that the
capacities doesn’t matter…. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Our system does not have any preheat or reheat coils. The proposed
is a SZRH that is connected to CHW and HW Loop (This is in essence to simulate
a THREE Deck Multi Zone System). T24 Standard system for this zone is PSZ.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There are both heating and cooling unmet load hrs, but on one
zone the heating unmet load hrs is 1300 and the rest of the zone are minor. This
single handedly is what is probably causing the problem.<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'>This zone is similar to many other zones in use, geometry and so
on and except for this one every other zone of similar nature functions
perfectly well….<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-family:"Calibri","sans-serif";color:#1F497D'><img
width=912 height=472 id="Picture_x0020_3"
src="cid:image001.jpg@01CAAA4A.CE5FD810"></span><span style='font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
color:#1F497D'>The same zone on the T24 Proposed appears perfectly normal….
See image below….<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><img
width=892 height=480 id="Picture_x0020_8"
src="cid:image002.jpg@01CAAA4A.CE5FD810"></span><span style='font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>So
again, T24 standard uses a PSZ and the T24 Proposed uses a SZRH…. It is
impossible for a zone to have a minimum temp at -57.8 F in May in San Diego……
the T24 Standard is doing something wrong! I tried many things, like increasing
the Hot Water Entering Zone temp., deleting the system for this zone and
re-assigning to a new system…. Nothing seems to solve the problem….<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Any
help would again be greatly appreciated….<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Prem</span><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>
<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"'> Hwakong Cheng
[mailto:hwakong@hotmail.com] <br>
<b>Sent:</b> Wednesday, February 10, 2010 11:59 AM<br>
<b>To:</b> Sundharam, Premnath<br>
<b>Subject:</b> RE: [Equest-users] Hrs exceeding throttling range on T24
baseline<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:"Verdana","sans-serif"'>In
my experience, insufficient capacity in primary equipment (chillers,
towers, fans, etc) is seldom the cause of hours out of throttling range. I
would look more at reheat capacities, presence/absence of preheat coil,
presence/absence of reheat coils, and other control issues. These are not
autosized by eQUEST - for example, sizing the reheat coil capacity is done in
DOE-2 by specifying the reheat delta T. Sometimes there are different system
types between the proposed and standard models that can cause differences in
unmet load hours between the two. Are your hours out of throttling due to
insufficient cooling, insufficient heating, or both? Is it one zone or many?
You probably need to review the detailed and hourly reports for the
standard model to understand what's not working right in that run... and then
figure out a way to fix that in the original model. <br>
<br>
We always see low heating energy in our T-24 proposed runs. We think it's
an artifact of eQUEST rather than a reflection of reality. <br>
<o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>
<hr size=2 width="100%" align=center id=stopSpelling>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Date: Wed, 10 Feb 2010 11:11:24 -0600<br>
From: psundharam@DLRGROUP.com<br>
To: equest-users@lists.onebuilding.org<br>
Subject: [Equest-users] Hrs exceeding throttling range on T24 baseline<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Hello
All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>I
am doing a Title 24 Compliance through eQuest and I am just trying to do a
reality check to see if the model is performing correct.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Based
on the T24 proposed and standard output files, it appears that the T24 standard
building has 17.6% outside of throttling range, where as the T24 proposed has
only 0.4% outside of throttling range.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>One
thing I don’t understand is, if the program calculates its own
capacities, then how could T24 standard have such a huge unmet load hours.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Anyways,
is there a way to fix the T24 standards unmet load hours even though the model
complies with T24?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Also
another question…. How do I check the heating capacity of the system
designed in Btu per sf in the output files… we typically see around 20
Btu per sf as the heating capacity required in Phoenix… assuming similar
condition in inland San Diego… I wanted to check the heating consumption
against capacity, the program is showing a really low heating need in San Diego
which I seriously doubt… see attached compliance report…<o:p></o:p></span></p>
<div style='border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><img
width=670 height=837 id="ecxPicture_x0020_1"
src="cid:image007.jpg@01CAAA4A.5CC310F0"><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><img
width=910 height=321 id="ecxPicture_x0020_2"
src="cid:image008.jpg@01CAAA4A.5CC310F0"><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Any
help would be greatly appreciated.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Prem<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:black'>Premnath
Sundharam, Assoc. AIA, LEED AP</span></b><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Architectural Designer | Senior Associate</span><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:#4D4D4D'>psundharam@dlrgroup.com</span><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>DLR Group</span></b><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>Architecture Engineering Planning Interiors</span><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#4D4D4D'>o: 602/381-8580<br>
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<a href="http://www.dlrgroup.com/"><span style='color:#4D4D4D'>dlrgroup.com</span></a>
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