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<div class=Section1>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'>Am I missing something or does this table and the corresponding
answer (7 unmet hours) not make sense.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 1 unmet
during:
6
8 <span style='color:
red'>14</span> <span
style='color:red'>16</span><o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 2 unmet
during:
6
8
12 16<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 3 unmet
during:
<span style='color:red'>7</span>
<span style='color:red'>8</span>
12 13<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'>If the columns (hours outside of throttling range) all represent
simultaneous hours in the model then wouldn’t the total number of hours be
the sum of the maximum number of hours for each time period? (</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>7+8+14+16</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>=45
hours outside of range) I have looked at the chart multiple ways and do not see
how seven (7) could ever be the correct value.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'>Yes, projects with hundreds of zones may be penalized however
ASHRAE allows similar spaces(orientation, load , HVAC system) to be combined
into a single zone which can reduce the impact of this issue.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'>I personally sum all of the hours ANY zone is outside of range
without regard to when the time period is. I feel that this is the most
accurate method of correctly sizing the HVAC systems.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#0070C0'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>Seth Spangler, LEED® AP <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>Project Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Georgia","serif";color:#0070C0'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>RMF Engineering, Inc <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>Ph: (843) 971-9639 ext:1497</span><span style='color:#0070C0'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>Fax: (843) 971-9641 <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:#0070C0'>sspangle@rmf.com</span><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#0070C0'><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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>ashu gupta<br>
<b>Sent:</b> Tuesday, October 27, 2009 1:17 AM<br>
<b>To:</b> 'Rosenberg, Michael I'; 'Nick Caton'; 'Crockett, Jim'; 'Kendra
Tupper'<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours<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";
color:navy'>Dear All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Explanation of Unmet Hours is as follows:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify'><b>Unmet Hours:</b><o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'>Unmet hours of a building are the
summation of the number of hours when the heating or the cooling set point
temperature of a zone is not met either by the HVAC system or by the plant.<o:p></o:p></p>
<p><b>Understanding/Interpreting/Calculating the number of unmet hours:</b><o:p></o:p></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='text-align:justify;mso-list:l0 level1 lfo3'>Unmet
hour is for a particular zone when the zone indoor temperature is higher
than the heating or cooling set point specified in that hour.<o:p></o:p></li>
<li class=MsoNormal style='text-align:justify;mso-list:l0 level1 lfo3'>The
number or the percentage of unmet hours in a building is usually given as
one of the outputs of the simulation.<o:p></o:p></li>
<li class=MsoNormal style='text-align:justify;mso-list:l0 level1 lfo3'>Zone
wise unmet can also be read from the various output files provided by the
software used for simulation.<o:p></o:p></li>
</ul>
<p class=MsoNormal style='text-align:justify'>(Example: <o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'>Visual DOE: “SS-J System
Peak Heating and Cooling Days” report &<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'>Energy Plus: Output Variable,
“Time Cooling Set point Not met”)<o:p></o:p></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='text-align:justify;mso-list:l1 level1 lfo6'>When
two zones are unmet at the same hour, this will count to one unmet hour
for the building.<o:p></o:p></li>
<li class=MsoNormal style='text-align:justify;mso-list:l1 level1 lfo6'>When
two zones have unmet hours during different non overlapping times of a
day, the total number of unmet hours in that day is the summation of these
unmet hours of each zone. This total for the year should be considered as
the total unmet hours of the building.<o:p></o:p></li>
</ul>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'><i>Example: </i><o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>When each zone
is unmet in the specified hours as beside,<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'> <o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 1 unmet
during:
6
8 14
16<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 2 unmet
during:
6
8
12 16<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.25in'>Zone 3 unmet
during:
7
8
12 13<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'>
<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.5in'>Total number of
unmet hours of the building: <b>7 hrs</b> and not 12hrs.<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify;text-indent:.5in'>6
7
8
12
13
14 16<o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'> <o:p></o:p></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='text-align:justify;mso-list:l5 level1 lfo9'>When
percentage of unmet is specified, than this is the percentage of total
number of hours (1 year- 8760 hours) for which the simulation is performed
(not just the occupied hours)<o:p></o:p></li>
<li class=MsoNormal style='text-align:justify;mso-list:l5 level1 lfo9'>As per
ASHRAE 90.1-2004, the unmet hours of the total building should be less
than or equal to 300 hours and the difference in the base case and
proposed case should be less than or equal to 50 hours.<o:p></o:p></li>
<li class=MsoNormal style='text-align:justify;mso-list:l5 level1 lfo9'>If
unmet load hours in the proposed building exceed the unmet load hours in
the baseline building by more than 50, then the size of equipment in the
baseline building shall be reduced incrementally, until the condition is
satisfied.<o:p></o:p></li>
</ul>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Thanks<o:p></o:p></span></p>
<div>
<p style='margin-bottom:12.0pt'><span style='font-size:10.0pt;color:#004080'>Ashu
Gupta,<br>
Project Engineer,<br>
Kamal Cogent Energy,<br>
Kamal Ratan Chanbers 1st Floor,<br>
Opp. GPO, M.I. Road,<br>
Jaipur 302001<br>
Ph 141 2373185(W)<br>
Ph 9251665008(M)<br>
</span><span style='font-family:"Book Antiqua","serif";color:#004080'><a
href="mailto:kce2@kamalcogentenergy.com"><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>kce2@kamalcogentenergy.com</span></a><br>
<a href="http://www.kamalcogentenergy.com"><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>www.kamalcogentenergy.com</span></a><o:p></o:p></span></p>
</div>
<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Rosenberg,
Michael I<br>
<b>Sent:</b> Tuesday, October 27, 2009 9:07 AM<br>
<b>To:</b> Nick Caton; Crockett, Jim; Kendra Tupper<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
think eQuest and any DOE2 based software does report the hours of loads not
being met as required by Appendix G. In the BEPS report it gives “PERCENT
OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE”. My understanding
of this number is that it is a percentage of scheduled fan run-time hours, so
some calculation may be necessary.<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>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Verdana","sans-serif";color:#D47500'>__________________________</span></b>
<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Verdana","sans-serif"'>Michael Rosenberg</span></b> <br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Senior
Commercial Buildings Energy Analyst</span> <br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>ENERGY &
ENVIRONMENT DIRECTORATE </span><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Pacific
Northwest National Laboratory </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2032 Todd
Street </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Eugene, OR
97405 </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>(541)
844-1960 </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>michael.rosenberg@pnl.gov
</span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#D47500'>www.pnl.gov</span>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><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"'> Nick Caton
[mailto:ncaton@smithboucher.com] <br>
<b>Sent:</b> Monday, October 26, 2009 8:20 PM<br>
<b>To:</b> Rosenberg, Michael I; Crockett, Jim; Kendra Tupper<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] Ashrae 90.1 - Unmet hours<o:p></o:p></span></p>
</div>
</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'>Mike,<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 appreciate you bringing this up. This definition drives
straight to the heart of defining the issue-at-hand… Since I kinda
presented both sides of the issue at once – I’d like to clarify
where I stand regarding what the correct interpretation <u>should be</u>.
<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 logic is as follows: If a modeled year has 8,760
hours, can there be 10,000 unmet load hours? By strict reading of the
standard’s definition below, I would put my foot down stating there can <u>only</u>
be 8,760, at most. <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'>By common practice however, it appears a majority (myself
included) sum unmet cooling/heating hours between the zones, even if they should
fall on the same modeled hour, against the intent of the standard. <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'>My pure speculation (for what it’s worth, as a young EIT)
is this practice developed because eQuest BDL reports don’t present the
crunched numbers in a way that makes the sum of unmet load hours, as intended
by 90.1, easy to determine. I wouldn’t be shocked to learn other
energy modeling software packages generate LEED compliance summaries featuring
unmet load hour totals in sync with the real intent of ASHRAE 90.1.<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'>If there’s anything I’ve learned from going out on a
limb, it’s that I’m sure to learn something whether I fall or not!<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'>~Nick<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=119 height=37 id="_x0000_i1026"
src="cid:image001.jpg@01CA56D5.D7AD6BD0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<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"'> Rosenberg, Michael
I [mailto:michael.rosenberg@pnl.gov] <br>
<b>Sent:</b> Monday, October 26, 2009 7:39 PM<br>
<b>To:</b> Nick Caton; Crockett, Jim; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] Ashrae 90.1 - Unmet hours<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"'>Nick,<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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Your
interpretation is the correct one. According to the definitions in Standard
90.1.<o:p></o:p></span></p>
<p class=definitions><b><i><span style='font-family:"Arial","sans-serif"'>unmet
load hour:</span></i></b><span style='font-family:"Arial","sans-serif"'> an
hour in which one or more zones is outside of the thermostat setpoint range.<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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mike<o:p></o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Verdana","sans-serif";color:#D47500'>__________________________</span></b>
<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Verdana","sans-serif"'>Michael Rosenberg</span></b> <br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Senior
Commercial Buildings Energy Analyst</span> <br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>ENERGY &
ENVIRONMENT DIRECTORATE </span><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Pacific
Northwest National Laboratory </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2032 Todd
Street </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Eugene, OR 97405
</span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>(541)
844-1960 </span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>michael.rosenberg@pnl.gov
</span><br>
<span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#D47500'>www.pnl.gov</span>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Monday, October 26, 2009 5:33 PM<br>
<b>To:</b> Crockett, Jim; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours<o:p></o:p></span></p>
</div>
</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'>Jim,<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'>That’s actually a really good question that I was afraid
to ask when I first encountered it – kudos to you! I’ve
currently resolved to follow what others seemed to be doing within and outside
of my office: Sum up all unmet hours for cooling and heating between the
zones just as you describe. In your example, I’d agree that
the unmet hours of your 301 zone building total 301.<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 do agree that this doesn’t seem intuitively to be the
intent of the standard, however between what is suggested within 90.1, the LEED
handbook, and the LEED credit templates – I honestly can’t see any
clear indication either way on which is the appropriate interpretation. <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 think the appropriate metric for ensuring appropriately sized
systems should be something like: “hours of the modeled year in which at
least one zone has an unmet cooling/heating load,” but I think that
was avoided by all concerned parties because it’s too wordy!<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'>My acting interpretation, again referencing your example, is
that all systems of your 301 zone example affecting the zones with unmet
cooling/heating hours should have their heating/cooling/overall sizing capacity
ratios increased incrementally until the design hours fall below 300 (and/or
within 50 of the sum from the other model, depending on your situation).<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'>Afraid I’m only really adding to the discussion here
without providing a solid answer. Would like to echo the desire to see
anyone’s experiences that would help us know the “right” way
to interpret this (in my case, specifically in the context of a LEED
submittal).<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=119 height=37 id="Picture_x005f_x0020_1"
src="cid:image001.jpg@01CA56D5.D7AD6BD0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Crockett,
Jim<br>
<b>Sent:</b> Monday, October 26, 2009 4:27 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Ashrae 90.1 - Unmet hours<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:"Courier New"'>Ashrae
90.1 (2004) Appendix G3.1.2.2 requires a baseline building to have less than
300 unmet hours. What exactly does this mean?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>To
illustrate my question: assume you have a building with 301 zones, and
each zone has 1 unmet hour per year. This gives you a total of 301 unmet
hours, and requires you to increase your baseline equipment capacity. But
you could argue that, on average, the building has only 1 unmet hour per year.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Have
any of you run into this? Is it addressed in an addendum somewhere, etc?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Any
help is appreciated. Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Jim
Crockett, P.E.</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Senior
Project Engineer</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Energy
& Carbon Management</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Nexant,
Inc.</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>4021 S.
700 E., Suite 250</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Salt
Lake City, Utah 84107</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>(801)
639-5603 - phone</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>(801)
266-4786 - fax</span><span style='font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New"'><o:p> </o:p></span></p>
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