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<p class=MsoNormal><span style='color:#1F497D'>Either the reviewer is wrong
(and they need to be educated so that LEED project Owners don’t have to keep
writing $500 appeal checks) or that help file is wrong. Or they are both right
</span><span style='font-family:Wingdings;color:#1F497D'>J</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'>There is an “Important Note” in
that help file that says “Any hours outside throttling range that occur during
night cycle control hours are included in the total hours outside throttling
range implied in the percentage above.”<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'>That’s an interesting statement.
If you set your single system to have a night cycle control strategy of “cycle
on first” (where the system only kicks on if the control zone is outside of the
throttling range), the help file is saying that ANY after-hours temperatures
outside of the throttling ranges will be included in the BEPU % calculation if
a night cycle control strategy is in place. With “cycle on first”, there could
be MANY hours where certain zones are outside of the throttling ranges, yet the
system fan is OFF. If those hours are being added to the numerator, then it is
implied that they are also being added to the denominator (even though the system
fan is OFF).<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'>So to me, I read this to say
that if you have ANY night cycle control strategy, the denominator
automatically goes to 8760.<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'>I could be wrong, but that’s why
I’ve always multiplied the BEPU % by 8760. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:teal'>GHT
Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='color:black'>, PE, LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><b><span style='color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span
style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span
style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span
style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-338-5754 (Cell)</span><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-243-1200 (Office)</span><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-276-1376 (Fax)</span><span style='color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:teal'><a
href="http://www.ghtltd.com/"><span style='font-size:10.0pt'>www.ghtltd.com</span></a><o:p></o:p></span></p>
<p class=MsoNormal><b><span style='color:#31849B'><o:p> </o:p></span></b></p>
</div>
<p class=MsoNormal><span style='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>Matthew
Dubrovich<br>
<b>Sent:</b> Thursday, July 22, 2010 9:59 PM<br>
<b>To:</b> Dakota Kelley; Brett M. West; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Unmet Load Hours Calc<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>I recently received a similar
response from a reviewer (same person?). Unfortunately my initial
response was not enough so now the team must appeal the denial. See
below. Per the attached screenshot from the eQuest detailed reports help
file, my understanding of the hours outside of the throttling range is the same
as Dakota’s: BEPS % Hours Outside * SS-E hours fans on = Total # of Hours
Outside Throttling Range. Correct? If it is, then I guess I just
need a better way to explain it to the reviewer… </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>
</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Initial comment:</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif"'>1.
Section 1.3 of the Template provides the total unmet load hours for the
Proposed (74 hours) and Baseline models (65 hours); however, the BEPS report
for the Baseline and Proposed model indicates that the total number of unmet
load hours is 70 (0.8% * <b>8,760</b> hours) and 140 (1.6% * <b>8,760</b>
hours), respectively. The total unmet load hours for each model is determined
by multiplying the number of hours in a year (<b>8,760</b>) by the ‘Percent of
hours any system zone outside of the throttling range’ in the BEPS report or
the BEPU report. With the revision, the total unmet load hours for the Proposed
model exceeds the total unmet load hours for the Baseline model by more than
50; however, Section G3.1.2.2 requires that the Proposed model does not exceed
the total unmet load hours for the Baseline model by more than 50. Please
revise the baseline model per the prescriptions of Section G3.1.2.2 so the
total unmet load hours for the proposed model does not exceed the total unmet
load hours for the baseline model by more than 50. Please note that the total
unmet load hours for the Proposed and Baseline models cannot exceed 300 as
required by Section G3.1.2.2.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>My initial response:</span><o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif";color:red'>Per eQuest help documentation,
the “percent hours any system zone outside of the throttling range” should be
multiplied by the hours the fans are operating in order to calculate total
underheated/undercooled hours. Per the SS-L [same as SS-E since this building
only has one system] report, the fans are operating on average </span><o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif";color:red'>7388 hours per year in the
Baseline and 4706 hours per year in the Proposed. That means the Baseline and
Proposed models indicate that the total number of unmet</span><o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif";color:red'>load hours is 59.1 (0.8% *
7388 hours) and 70.6 (1.5% * 4706 hours), respectively. The different fan
runtimes are due to the time the fans must run during unoccupied hours to
maintain setback temperatures.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Denied!</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif"'>1.
The response narrative to preliminary comment 1 states that the hours outside
throttling range apply only to hours in which the interior fans operate however
the eQUEST Help states that the “percent of hours any system zone outside of
throttling range is the percentage of hours when the temperature in any
conditioned zone is outside of the thermostat’s throttling range”. If appealing
this credit please revise the Baseline case per the prescriptions of Section
G3.1.2.2 so that the difference in the number of unmet load hours is less than
50.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><b><span style='font-family:"BankGothic Md BT","sans-serif";
color:#1F497D'>Matt Dubrovich, </span></b><span style='font-family:"BankGothic Md BT","sans-serif";
color:#1F497D'>PE<i>, </i>CEM, BEMP</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>EMC Engineers, Inc.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:5.0pt;margin-right:0in;margin-bottom:
5.0pt;margin-left:0in'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Making buildings work. </span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>Better.</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>(303) 974-1217 - direct</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>(720) 279-4426 - mobile</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>(303) 974-1239 - fax</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><a href="http://www.emcengineers.com/">www.emcengineers.com</a></span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:5.0pt;margin-right:0in;margin-bottom:
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<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dakota
Kelley<br>
<b>Sent:</b> Thursday, July 22, 2010 5:34 PM<br>
<b>To:</b> Brett M. West; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Unmet Load Hours Calc</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Brett,</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Let me state a few things, and
then I’ll offer my interpretation of the comment:</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><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”.</span><o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><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).</span><o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><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>. 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><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Now for the review
comment. The “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.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'><img
border=0 width=63 height=84 id="_x0000_i1025"
src="cid:image001.jpg@01CB29EB.AEFBEBF0"></span><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:black'>
</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><b><span
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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</span><o:p></o:p></p>
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<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. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></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><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></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. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></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. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Any input on this topic would
be greatly appreciated.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Thanks in advance.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"BankGothic Lt BT","sans-serif"'>BRETT
M. WEST</span></b><o:p></o:p></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</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"BankGothic Lt BT","sans-serif"'>T:
843.971.9639 ext. 1499</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"BankGothic Lt BT","sans-serif"'>F:
843.971.9641</span><o:p></o:p></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><o:p></o:p></p>
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