dear All...<br><br>the entire issue with unmet hours has been analysed on my website, on this link<br><br><a href="http://greenbuildinggenie.com/tips/leed-issues/item/15-understanding-total-number-of-unmet-hours-as-per-ashrae-901-">http://greenbuildinggenie.com/tips/leed-issues/item/15-understanding-total-number-of-unmet-hours-as-per-ashrae-901-</a><br>
<br>regards<br><br><div class="gmail_quote">On Tue, Oct 27, 2009 at 10:46 AM, ashu gupta <span dir="ltr"><<a href="mailto:kce2@kamalcogentenergy.com">kce2@kamalcogentenergy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Dear All,</span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Explanation of Unmet Hours is as follows:</span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal" style="text-align: justify;"><b><font size="3" face="Times New Roman"><span style="font-size: 12pt; font-weight: bold;">Unmet
Hours:</span></font></b></p>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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.</span></font></p>
<p><b><font size="3" face="Times New Roman"><span style="font-size: 12pt; font-weight: bold;">Understanding/Interpreting/Calculating the number of unmet
hours:</span></font></b></p>
<ul style="margin-top: 0in;" type="disc">
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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.</span></font></li>
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">The number or
the percentage of unmet hours in a building is usually given as one of the
outputs of the simulation.</span></font></li>
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Zone wise
unmet can also be read from the various output files provided by the
software used for simulation.</span></font></li>
</ul>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">(Example: </span></font></p>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Visual DOE: “SS-J
System Peak Heating and Cooling Days” report &</span></font></p>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Energy Plus: Output
Variable, “Time Cooling Set point Not met”)</span></font></p>
<ul style="margin-top: 0in;" type="disc">
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">When two
zones are unmet at the same hour, this will count to one unmet hour for
the building.</span></font></li>
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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.</span></font></li>
</ul>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><i><font size="3" face="Times New Roman"><span style="font-size: 12pt; font-style: italic;">Example:
</span></font></i></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">When each zone is unmet
in the specified hours as beside,</span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Zone 1 unmet
during:
6
8
14 16</span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Zone 2 unmet
during:
6
8
12 16</span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.25in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Zone 3 unmet
during:
7
8
12 13</span></font></p>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">
</span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Total number of unmet
hours of the building: <b><span style="font-weight: bold;">7 hrs</span></b> and
not 12hrs.</span></font></p>
<p class="MsoNormal" style="text-align: justify; text-indent: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">6
7
8
12
13
14 16</span></font></p>
<p class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<ul style="margin-top: 0in;" type="disc">
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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)</span></font></li>
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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.</span></font></li>
<li class="MsoNormal" style="text-align: justify;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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.</span></font></li>
</ul>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Thanks</span></font></p>
<div>
<p style="margin-bottom: 12pt;"><font size="2" color="#004080" face="Times New Roman"><span style="font-size: 10pt; color: rgb(0, 64, 128);">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></font><font color="#004080" face="Book Antiqua"><span style="font-family: "Book Antiqua"; color: rgb(0, 64, 128);"><a href="mailto:kce2@kamalcogentenergy.com" target="_blank"><font size="2" face="Times New Roman"><span style="font-size: 10pt; font-family: "Times New Roman";">kce2@kamalcogentenergy.com</span></font></a><br>
<a href="http://www.kamalcogentenergy.com" target="_blank"><font size="2" face="Times New Roman"><span style="font-size: 10pt; font-family: "Times New Roman";">www.kamalcogentenergy.com</span></font></a><br>
<br>
</span></font><font color="#004080" face="Book Antiqua"><span style="font-family: "Book Antiqua"; color: rgb(0, 64, 128);"></span></font></p>
</div>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">
<hr align="center" size="2" width="100%">
</span></font></div>
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Rosenberg, Michael I<br>
<b><span style="font-weight: bold;">Sent:</span></b> Tuesday, October 27, 2009
9:07 AM<br>
<b><span style="font-weight: bold;">To:</span></b> Nick Caton; Crockett, Jim;
Kendra Tupper<div class="im"><br>
<b><span style="font-weight: bold;">Cc:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
</div><div><div></div><div class="h5"><b><span style="font-weight: bold;">Subject:</span></b> Re: [Bldg-sim] Ashrae
90.1 - Unmet hours</div></div></span></font></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">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.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<div>
<p class="MsoNormal"><b><font size="3" color="#d47500" face="Verdana"><span style="font-size: 12pt; font-family: Verdana; color: rgb(212, 117, 0); font-weight: bold;">__________________________</span></font></b>
</p>
<p class="MsoNormal"><b><font size="3" face="Verdana"><span style="font-size: 12pt; font-family: Verdana; font-weight: bold;">Michael Rosenberg</span></font></b> <br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Senior
Commercial Buildings Energy Analyst</span></font> <br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">ENERGY
& ENVIRONMENT DIRECTORATE </span></font></p>
</div>
<p class="MsoNormal"><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Pacific Northwest National Laboratory </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">2032 Todd Street</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"> </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Eugene</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">, OR 97405</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"> </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">(541)
844-1960 </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"><a href="mailto:michael.rosenberg@pnl.gov" target="_blank">michael.rosenberg@pnl.gov</a>
</span></font><br>
<font size="2" color="#d47500" face="Verdana"><span style="font-size: 10pt; font-family: Verdana; color: rgb(212, 117, 0);"><a href="http://www.pnl.gov" target="_blank">www.pnl.gov</a></span></font> <font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
<div>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"> Nick Caton
[mailto:<a href="mailto:ncaton@smithboucher.com" target="_blank">ncaton@smithboucher.com</a>] <br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, October 26, 2009
8:20 PM<br>
<b><span style="font-weight: bold;">To:</span></b> Rosenberg, Michael I;
Crockett, Jim; Kendra Tupper<br>
<b><span style="font-weight: bold;">Cc:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> RE: [Bldg-sim] Ashrae
90.1 - Unmet hours</span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Mike,</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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>. </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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. </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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. </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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.</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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!</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">~Nick</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<div>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><img src="" alt="cid:489575314@22072009-0ABB" border="0" height="37" width="119"></span></font><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"></span></font></b></p>
<p class="MsoNormal"><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"> </span></font></b></p>
<p class="MsoNormal"><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;">NICK
CATON, E.I.T.</span></font></b><b><font color="#2d4d5e" face="Stylus BT"><span style="font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"></span></font></b></p>
<p class="MsoNormal"><font size="1" color="#cc9900" face="Calibri"><span style="font-size: 7.5pt; font-family: Calibri; color: rgb(204, 153, 0);">PROJECT ENGINEER</span></font><font size="1" color="#cc9900"><span style="font-size: 7.5pt; color: rgb(204, 153, 0);"></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">25501 west valley
parkway</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">olathe</span></font><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);"> ks 66061</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">direct 913 344.0036</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">fax 913 345.0617</span></font></p>
<p class="MsoNormal"><i><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94); font-style: italic;">Check
out our new web-site @ </span></font></i><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><font size="2"><span style="font-size: 10pt;">www.smithboucher.com</span></font></a></span></font><u><font size="2" color="blue" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: blue;"> </span></font></u><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"></span></font></p>
</div>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<div>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"> Rosenberg,
Michael I [mailto:<a href="mailto:michael.rosenberg@pnl.gov" target="_blank">michael.rosenberg@pnl.gov</a>] <br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, October 26, 2009
7:39 PM<br>
<b><span style="font-weight: bold;">To:</span></b> Nick Caton; Crockett, Jim;
<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> RE: [Bldg-sim] Ashrae
90.1 - Unmet hours</span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Nick,</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Your interpretation is the correct one. According to the
definitions in Standard 90.1.</span></font></p>
<p><b><i><font size="2" color="black" face="Arial"><span style="font-size: 10pt; font-family: Arial; font-weight: bold; font-style: italic;">unmet
load hour:</span></font></i></b><font face="Arial"><span style="font-family: Arial;">
an hour in which one or more zones is outside of the thermostat setpoint range.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Mike</span></font></p>
<div>
<p class="MsoNormal"><b><font size="3" color="#d47500" face="Verdana"><span style="font-size: 12pt; font-family: Verdana; color: rgb(212, 117, 0); font-weight: bold;">__________________________</span></font></b>
</p>
<p class="MsoNormal"><b><font size="3" face="Verdana"><span style="font-size: 12pt; font-family: Verdana; font-weight: bold;">Michael Rosenberg</span></font></b> <br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Senior
Commercial Buildings Energy Analyst</span></font> <br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">ENERGY
& ENVIRONMENT DIRECTORATE </span></font></p>
</div>
<p class="MsoNormal"><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Pacific Northwest National Laboratory </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">2032 Todd Street</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"> </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">Eugene</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">, OR 97405</span></font><font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"> </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;">(541)
844-1960 </span></font><br>
<font size="2" face="Verdana"><span style="font-size: 10pt; font-family: Verdana;"><a href="mailto:michael.rosenberg@pnl.gov" target="_blank">michael.rosenberg@pnl.gov</a>
</span></font><br>
<font size="2" color="#d47500" face="Verdana"><span style="font-size: 10pt; font-family: Verdana; color: rgb(212, 117, 0);"><a href="http://www.pnl.gov" target="_blank">www.pnl.gov</a></span></font> <font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
<div>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Nick Caton<br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, October 26, 2009
5:33 PM<br>
<b><span style="font-weight: bold;">To:</span></b> Crockett, Jim;
<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [Bldg-sim] Ashrae
90.1 - Unmet hours</span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Jim,</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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.</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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. </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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!</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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).</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">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).</span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<div>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><img src="" alt="cid:489575314@22072009-0ABB" border="0" height="37" width="119"></span></font><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"></span></font></b></p>
<p class="MsoNormal"><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"> </span></font></b></p>
<p class="MsoNormal"><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size: 11pt; font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;">NICK
CATON, E.I.T.</span></font></b><b><font color="#2d4d5e" face="Stylus BT"><span style="font-family: "Stylus BT"; color: rgb(45, 77, 94); font-weight: bold;"></span></font></b></p>
<p class="MsoNormal"><font size="1" color="#cc9900" face="Calibri"><span style="font-size: 7.5pt; font-family: Calibri; color: rgb(204, 153, 0);">PROJECT ENGINEER</span></font><font size="1" color="#cc9900"><span style="font-size: 7.5pt; color: rgb(204, 153, 0);"></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">25501 west valley
parkway</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">olathe</span></font><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);"> ks 66061</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">direct 913 344.0036</span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94);">fax 913 345.0617</span></font></p>
<p class="MsoNormal"><i><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: rgb(45, 77, 94); font-style: italic;">Check
out our new web-site @ </span></font></i><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><font size="2"><span style="font-size: 10pt;">www.smithboucher.com</span></font></a></span></font><u><font size="2" color="blue" face="Calibri"><span style="font-size: 10pt; font-family: Calibri; color: blue;"> </span></font></u><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"></span></font></p>
</div>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"> </span></font></p>
<div>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>]
<b><span style="font-weight: bold;">On Behalf Of </span></b>Crockett, Jim<br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, October 26, 2009
4:27 PM<br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [Bldg-sim] Ashrae 90.1 -
Unmet hours</span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; 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?</span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; 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.</span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Have any of you run into this? Is it addressed
in an addendum somewhere, etc?</span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Any help is appreciated. Thanks,</span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Jim Crockett, P.E.</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="3" face="Courier New"><span style="font-size: 12pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Senior Project Engineer</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Energy & Carbon Management</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Nexant, Inc.</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">4021 S. 700 E., Suite 250</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">Salt
Lake City</span></font><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">, Utah
84107</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="3" face="Courier New"><span style="font-size: 12pt; font-family: "Courier New";"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">(801) 639-5603 - phone</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="2" face="Courier New"><span style="font-size: 10pt; font-family: "Courier New";">(801) 266-4786 - fax</span></font><font face="Courier New"><span style="font-family: "Courier New";"></span></font></p>
<p class="MsoNormal"><font size="3" face="Courier New"><span style="font-size: 12pt; font-family: "Courier New";"> </span></font></p>
</div></div></div>
</div>
<br>_______________________________________________<br>
Bldg-sim mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
<br></blockquote></div><br><br clear="all"><br>-- <br>Deepak Agrawal<br>Hyderabad, India<br>