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<p class=MsoNormal><span style='color:#1F497D'>Brett,<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Let me state a few things, and then
I’ll offer my interpretation of the comment:<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>

<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>        
</span></span></span><![endif]><span style='color:#1F497D'>The numbers in the
SS-R report are the same numbers shown in the Air-Side Summary report.  These
reports will yield inflated system totals, and therefore simulation totals, for
multi-zone systems due to simultaneous counting of separate zones which belong
to the same system.  Use them to determine the ratio of unmet heating and
cooling hours relative to the two combined, but the sum of hours in these
reports is not necessarily the same as multiplying the BEPS percentage by “hours
fans on”.<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>        
</span></span></span><![endif]><span style='color:#1F497D'>Multiplying the BEPS
percentage by the “hours fans on” in the SS-E report yields the correct sum of
unmet heating and cooling hours, regardless of whether you are modeling multi-
or single-zone systems.  Use the ratio obtained above to allocate this total
between heating and cooling hours (I have <a
href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-July/005293.html">posted
previously</a> that there may be a more accurate method of allocating heating/cooling
hours, but no one has corrected me).<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo5'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>        
</span></span></span><![endif]><span style='color:#1F497D'>The “hours fans on”
includes hours the fans are <i>scheduled</i> <i>on</i> and the hours they are
scheduled off but <i>cycle</i> <i>on</i>.  </span><span style='color:#1F497D'>Refer
to DOE2.2 Volume 4 (build 47), page 138 (SS-C report description), for the
“hours fans on” definition.  This definition is echoed on page 142 (SS-E report
description).  Therefore, for any system that cycles during off hours, all
8,760 hours have the potential to be counted as an unmet hour.</span><span
style='color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Now for the review comment.  The</span><span
style='color:#1F497D'> “hours each zone exists” phrase doesn’t make sense on
the first pass.  However, due to the last bullet point above and baseline
requirement G3.1.2.4, “hours each zone exists” is practically the same thing as
“hours the systems are on”.  All 8,760 hours have the potential to be counted
as an unmet hour if the hourly T-stat setting & throttling range are not
satisfied.  What if the proposed model doesn’t cycle over night?  I say that’s
a bad idea; I would never design a system that way unless an owner wants mold, frozen
pipes, etc.  Define a reasonable set back temperature, allow fans to cycle, and
they will stay off if cycling is unnecessary.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Where the comment is confusing/wrong
is: “<i>SS-R reports have been used…does not take into account coincident hours</i>”. 
Yes, it does.  It double-counts coincident hours on a multi-zone system, and because
it is a system-level report, each system’s zones are counted separately.  It is
as “coincident” as it gets.  I’m not sure how the reviewer rejects the SS-R
report but then arrives at totals which are apparently greater than what was reported. 
I have no .SIM file to review, but the smell of nonsense is strong.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>

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<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>

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</span><![endif]><span style='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='font-size:12.0pt;
font-family:"Times New Roman","serif";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
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";
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<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
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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>

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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><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"'> Brett M. West
[mailto:bwest@rmf.com] <br>
<b>Sent:</b> Thursday, July 22, 2010 8:01 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Unmet Load Hours Calc<o:p></o:p></span></p>

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<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal><span style='font-size:12.0pt'>I have a question regarding
the way unmet load hours are calculated in eQuest. I have received the
following comments from the USGBC reviewer after submitting my energy model. <o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1.
The response narrative to preliminary comment 1 states that the SS-R reports
have been used to determine the number of unmet load hours for each case however
this method does not take into account coincident hours. Additionally, the
number of hours any system outside of throttling range is not the number of
hours the HVAC system is in operation but rather it is the number of hours each
zone exists during the building simulation, or 8,760 hours. Therefore the
number of unmet load hours is 333 in the Baseline case and 508 in the Proposed
case and the simulation does not meet the requirements of Section G3.1.2.2. If
appealing this credit please revise both cases using the prescriptions of
Section G3.1.2.2 until the number of unmet load hours is less than 300 for both
cases and the number in the Proposed case does not exceed the number in the
Baseline case by more than 50.</span></i><span style='font-size:12.0pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'>I thought the unmet load hours
were calculated only during times when the fans are actually running in the
simulation. This is why I always pull my unmet hours from the SS-R report,
adding up the unmet hours for both cooling and heating for each individual
unit. I can also go into the SS-E report and calculate the number of hours my
fans are actually running and then calculate the total number of hours by using
the percentage of hours outside the throttling range given in the BEPS report. <o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'>If you calculate the hours in
the manner the reviewer has outlined then there is no way to show which hours
are heating and which are cooling and you have to provide that breakdown in the
EAc1 template. <o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'>Any input on this topic would
be greatly appreciated.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'>Thanks in advance.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>

<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"BankGothic Lt BT","sans-serif"'>BRETT
M. WEST<o:p></o:p></span></b></p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"BankGothic Lt BT","sans-serif"'>RMF
ENGINEERING<b><o:p></o:p></b></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"BankGothic Lt BT","sans-serif"'>T:
843.971.9639 ext. 1499</span><span style='font-family:"BankGothic Lt BT","sans-serif"'><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"BankGothic Lt BT","sans-serif"'>F:
843.971.9641</span><span style='font-family:"BankGothic Lt BT","sans-serif"'><o:p></o:p></span></p>

<p class=MsoNormal><span style='font-family:"BankGothic Lt BT","sans-serif"'><a
href="mailto:bwest@rmf.com"><span style='font-size:10.0pt'>bwest@rmf.com</span></a></span><span
style='font-family:"BankGothic Md BT","sans-serif"'><o:p></o:p></span></p>

<p class=MsoNormal><o:p> </o:p></p>

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