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<DIV id=idOWAReplyText32194 dir=ltr>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>To get 7 unmet hours you need
to interpret the numbers listed as hours of the day when the load was unmet.
There are 7 unique hours when the load was not met. There are differing opinions
on how unmet load hours should be calculated but this seems like the most
logical but possibly not the most practical depending on the simulation software
used.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2></FONT> </DIV></DIV>
<DIV id=idSignature18735 dir=ltr>
<DIV><FONT face=Arial color=#000000 size=2>
<DIV class=MsoAutoSig><FONT face="Times New Roman" color=purple size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: purple">David Wasserman</SPAN></FONT><FONT
color=purple><SPAN style="COLOR: purple">, Senior Research Engineer, MS ME, LEED
EB AP<BR>Southface - Responsible Solutions for Environmental Living<BR>241 Pine
St., NE, Atlanta, GA 30308<FONT color=black><SPAN
style="COLOR: windowtext"><BR></SPAN></FONT>Direct: 404-604-3588; Main:
404-872-3549; Fax: 404-872-5009<BR></SPAN></FONT><FONT color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy"><A title=mailto:david@southface.org
href="mailto:david@southface.org" target=_blank><FONT
title=mailto:david@southface.org size=3><SPAN
title=mailto:david@southface.org><SPAN
style="FONT-SIZE: 12pt">david@southface.org</SPAN></SPAN></FONT></A></SPAN></FONT><FONT
color=purple><SPAN style="COLOR: purple">; www.southface.org</SPAN></FONT><FONT
size=2><SPAN style="FONT-SIZE: 10pt"></SPAN></FONT></DIV></FONT></DIV></DIV>
<DIV dir=ltr><BR>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org on
behalf of Seth P. Spangler<BR><B>Sent:</B> Tue 10/27/2009 7:34 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [SPAM] Re: [Bldg-sim] Ashrae
90.1 - Unmet hours<BR></FONT><BR></DIV>
<DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'">Am I
missing something or does this table and the corresponding answer (7 unmet
hours) not make sense.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 1 unmet
during:
6
8 <SPAN
style="COLOR: red">14</SPAN> <SPAN
style="COLOR: red">16</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 2 unmet
during:
6
8
12 16</P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 3 unmet
during:
<SPAN
style="COLOR: red">7</SPAN>
<SPAN
style="COLOR: red">8</SPAN>
12 13</P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'">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: 10pt; COLOR: red; FONT-FAMILY: 'Arial','sans-serif'">7+8+14+16</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'">=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.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'">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.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'">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.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">Seth
Spangler, LEEDŽ AP </SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">Project Engineer</SPAN></P>
<P class=MsoNormal><SPAN
style="COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">RMF
Engineering, Inc </SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">Ph:
(843) 971-9639 ext:1497</SPAN><SPAN style="COLOR: #0070c0"></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">Fax:
(843) 971-9641 </SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Georgia','serif'">sspangle@rmf.com</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: #0070c0; FONT-FAMILY: 'Arial','sans-serif'"></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'">Dear
All,</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'">Explanation
of Unmet Hours is as follows:</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal style="TEXT-ALIGN: justify"><B>Unmet Hours:</B></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.</P>
<P><B>Understanding/Interpreting/Calculating the number of unmet hours:</B></P>
<UL style="MARGIN-TOP: 0in" type=disc>
<LI class=MsoNormal style="TEXT-ALIGN: justify">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.
<LI class=MsoNormal style="TEXT-ALIGN: justify">The number or the percentage
of unmet hours in a building is usually given as one of the outputs of the
simulation.
<LI class=MsoNormal style="TEXT-ALIGN: justify">Zone wise unmet can also be
read from the various output files provided by the software used for
simulation. </LI></UL>
<P class=MsoNormal style="TEXT-ALIGN: justify">(Example: </P>
<P class=MsoNormal style="TEXT-ALIGN: justify">Visual DOE: “SS-J System Peak
Heating and Cooling Days” report &</P>
<P class=MsoNormal style="TEXT-ALIGN: justify">Energy Plus: Output Variable,
“Time Cooling Set point Not met”)</P>
<UL style="MARGIN-TOP: 0in" type=disc>
<LI class=MsoNormal style="TEXT-ALIGN: justify">When two zones are unmet at
the same hour, this will count to one unmet hour for the building.
<LI class=MsoNormal style="TEXT-ALIGN: justify">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. </LI></UL>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify"><I>Example:
</I></P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">When each
zone is unmet in the specified hours as beside,</P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify"> </P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 1 unmet
during:
6
8
14 16</P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 2 unmet
during:
6
8
12 16</P>
<P class=MsoNormal style="TEXT-INDENT: 0.25in; TEXT-ALIGN: justify">Zone 3 unmet
during:
7
8
12 13</P>
<P class=MsoNormal
style="TEXT-ALIGN: justify">
</P>
<P class=MsoNormal style="TEXT-INDENT: 0.5in; TEXT-ALIGN: justify">Total number
of unmet hours of the building: <B>7 hrs</B> and not 12hrs.</P>
<P class=MsoNormal
style="TEXT-INDENT: 0.5in; TEXT-ALIGN: justify">6
7
8
12
13
14 16</P>
<P class=MsoNormal style="TEXT-ALIGN: justify"> </P>
<UL style="MARGIN-TOP: 0in" type=disc>
<LI class=MsoNormal style="TEXT-ALIGN: justify">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)
<LI class=MsoNormal style="TEXT-ALIGN: justify">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.
<LI class=MsoNormal style="TEXT-ALIGN: justify">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. </LI></UL>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: 'Arial','sans-serif'">Thanks</SPAN></P>
<DIV>
<P style="MARGIN-BOTTOM: 12pt"><SPAN
style="FONT-SIZE: 10pt; 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="COLOR: #004080; FONT-FAMILY: 'Book Antiqua','serif'"><A
href="mailto:kce2@kamalcogentenergy.com"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman','serif'">kce2@kamalcogentenergy.com</SPAN></A><BR><A
href="http://www.kamalcogentenergy.com"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman','serif'">www.kamalcogentenergy.com</SPAN></A></SPAN></P></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center>
<HR align=center width="100%" SIZE=2>
</DIV>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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></P></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; 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.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<DIV>
<P class=MsoNormal><B><SPAN
style="COLOR: #d47500; FONT-FAMILY: 'Verdana','sans-serif'">__________________________</SPAN></B>
</P>
<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Verdana','sans-serif'">Michael
Rosenberg</SPAN></B> <BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Senior Commercial
Buildings Energy Analyst</SPAN> <BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">ENERGY &
ENVIRONMENT DIRECTORATE </SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Pacific Northwest
National Laboratory </SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">2032 Todd Street
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Eugene, OR 97405
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">(541) 844-1960
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">michael.rosenberg@pnl.gov
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; COLOR: #d47500; FONT-FAMILY: 'Verdana','sans-serif'">www.pnl.gov</SPAN>
<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Mike,</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">~Nick</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><IMG
id=_x0000_i1026 height=37 alt=cid:489575314@22072009-0ABB src="image001.jpg"
width=119 border=0></SPAN><B><SPAN
style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'"></SPAN></B></P>
<P class=MsoNormal><B><SPAN
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<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'">NICK
CATON, E.I.T.</SPAN></B><B><SPAN
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style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">olathe
ks 66061</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">direct
913 344.0036</SPAN></P>
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<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Nick,</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Your interpretation
is the correct one. According to the definitions in Standard 90.1.</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.</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Mike</SPAN></P>
<DIV>
<P class=MsoNormal><B><SPAN
style="COLOR: #d47500; FONT-FAMILY: 'Verdana','sans-serif'">__________________________</SPAN></B>
</P>
<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Verdana','sans-serif'">Michael
Rosenberg</SPAN></B> <BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Senior Commercial
Buildings Energy Analyst</SPAN> <BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">ENERGY &
ENVIRONMENT DIRECTORATE </SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Pacific Northwest
National Laboratory </SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">2032 Todd Street
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Eugene, OR 97405
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">(541) 844-1960
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">michael.rosenberg@pnl.gov
</SPAN><BR><SPAN
style="FONT-SIZE: 10pt; COLOR: #d47500; FONT-FAMILY: 'Verdana','sans-serif'">www.pnl.gov</SPAN>
<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Jim,</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><IMG
id=Picture_x005f_x0020_1 height=37 alt=cid:489575314@22072009-0ABB
src="image001.jpg" width=119 border=0></SPAN><B><SPAN
style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'"></SPAN></B></P>
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style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'"></SPAN></B> </P>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 11pt; COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'">NICK
CATON, E.I.T.</SPAN></B><B><SPAN
style="COLOR: #2d4d5e; FONT-FAMILY: 'Stylus BT','sans-serif'"></SPAN></B></P>
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style="FONT-SIZE: 7.5pt; COLOR: #cc9900; FONT-FAMILY: 'Calibri','sans-serif'">PROJECT
ENGINEER</SPAN><SPAN style="FONT-SIZE: 7.5pt; COLOR: #cc9900"></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">25501
west valley parkway</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">olathe
ks 66061</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">direct
913 344.0036</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">fax
913 345.0617</SPAN></P>
<P class=MsoNormal><I><SPAN
style="FONT-SIZE: 10pt; COLOR: #2d4d5e; FONT-FAMILY: 'Calibri','sans-serif'">Check
out our new web-site @ </SPAN></I><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><A
title=blocked::www.smithboucher.com href=""><SPAN
style="FONT-SIZE: 10pt">www.smithboucher.com</SPAN></A></SPAN><U><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Calibri','sans-serif'">
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<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><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></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Any
help is appreciated. Thanks,</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Jim
Crockett, P.E.</SPAN><SPAN style="FONT-FAMILY: 'Courier New'"></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal><SPAN
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<P class=MsoNormal><SPAN
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<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Nexant, Inc.</SPAN><SPAN
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<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">4021 S. 700 E., Suite
250</SPAN><SPAN style="FONT-FAMILY: 'Courier New'"></SPAN></P>
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