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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you sum them up, you will often end up with more hours than
what the BEPS/BEPU reports show. <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'>_____________<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Demba NDIAYE<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>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Chris
Jones<br>
<b>Sent:</b> Monday, April 19, 2010 5:28 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] How do I get unmet cooling/heating hours to
showup in my sim file BEPU report?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I had assumed that the SS-R report showed the number of
under heated and under cooled hours and was sufficient for LEED submissions?<br>
<br>
At 05:04 PM 4/19/2010, Nick Caton wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>Content-class: urn:content-classes:message<br>
Content-Type: multipart/related; type="multipart/alternative";<br>
boundary="----_=_NextPart_001_01CAE003.EBF127E7"<br>
<br>
Looks exciting… I think I know what we’re looking at…<br>
<br>
Copied below is a (lengthy) discussion which essentially concluded with one of
Scott Criswell’s typical answers – hammering the confusion out of us all
=). In it, he mentions the plan to include this helpful information in
future DOE2/eQuest releases… hopefully this is coming sooner than later!<br>
<br>
~Nick<br>
<br>
<img width=119 height=37 id="_x0000_i1025"
src="cid:image001.jpg@01CADFEB.EE8BFA20" alt="cid:489575314@22072009-0ABB"><br>
<b> <br>
NICK CATON, E.I.T.<br>
</b>PROJECT ENGINEER<br>
25501 west valley parkway<br>
olathe ks 66061<br>
direct 913 344.0036<br>
fax 913 345.0617<br>
<i>Check out our new web-site @ </i><a href="www.smithboucher.htm">www.smithboucher.com</a><u>
<br>
</u> <br>
<b>From:</b> equest-users-bounces@lists.onebuilding.org [<a
href="mailto:equest-users-bounces@lists.onebuilding.org">
mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Demba
Ndiaye<br>
<b>Sent:</b> Monday, April 19, 2010 3:01 PM<br>
<b>To:</b> Carol Gardner; Bishop, Bill<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] How do I get unmet cooling/heating hours
toshow up in my sim file BEPU report?<br>
<br>
Well, this seems new; never seen it. A quick glance at my eQuest reports tells
me that the 3.63 – build 6510 version I have runs with DOE-2.2-47d. I see here
“h”, so it looks like the new one (or a test version).<br>
<br>
Anyway, this is the info we need for LEED EAc1 Template. And we cannot get it
from the SS-F/SS-R ‘cause they would include the coincident hours, while this
one does not seem to.<br>
<br>
______________<br>
Demba NDIAYE<br>
<br>
<b>From:</b> equest-users-bounces@lists.onebuilding.org [<a
href="mailto:equest-users-bounces@lists.onebuilding.org">
mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Carol
Gardner<br>
<b>Sent:</b> Monday, April 19, 2010 3:14 PM<br>
<b>To:</b> Bishop, Bill<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] How do I get unmet cooling/heating hours to
show up in my sim file BEPU report?<br>
<br>
Quick first take. It looks like the numbers that would come from an SS-F/SS-R
report summed up. I have never seen this either. <br>
<br>
Maybe you can turn it off somehow? What do the above referenced reports show?<br>
<br>
Carol<br>
On Mon, Apr 19, 2010 at 12:00 PM, Bishop, Bill <<a
href="mailto:wbishop@pathfinder-ea.com"> wbishop@pathfinder-ea.com</a>>
wrote:<br>
I have an eQUESTion:<br>
<br>
How do I get this to show up in my sim files? Is this a newer installation? All
I ever get is the first two “Percent of Hours” lines. (And it’s not because I
always have zero unmet hours…)<br>
<br>
Thanks,<br>
Bill<br>
<br>
<img border=0 width=914 height=394 id="_x0000_i1026"
src="cid:image002.jpg@01CADFEB.EE8BFA20" alt="[]"><br>
<br>
<br>
<b>William Bishop, EIT, BEMP, LEED<sup>®</sup> AP | Pathfinder Engineers &
Architects LLP<br>
</b>Mechanical Engineer<br>
<br>
134 South Fitzhugh Street<br>
Rochester, NY 14608<br>
T: (585) 325-6004 Ext. 114<br>
F: (585) 325-6005<br>
<a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a> <br>
<a href="http://www.pathfinder-ea.com/">www.pathfinder-ea.com</a><br>
P Please strive to live sustainably.<br>
<br>
<br>
_______________________________________________<br>
Equest-users mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a>
<br>
To unsubscribe from this mailing list send a blank message to <a
href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
<b>\From:</b> equest-users-bounces@lists.onebuilding.org [<a
href="mailto:equest-users-bounces@lists.onebuilding.org"> mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Wednesday, October 28, 2009 7:33 AM<br>
<b>To:</b> Scott Criswell; steve.gates@doe2.com<br>
<b>Cc:</b> equest-users@lists.onebuilding.org; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
Scott,<br>
<br>
Wanted to express thanks I’m certain many of us in the community share for you,
Steve Gates and the rest of the DOE-2 team. I know I’m not the only one
looking forward very much to this new feature!<br>
<br>
~Nick<br>
<br>
<img border=0 width=119 height=37 id="_x0000_i1027"
src="cid:image001.jpg@01CADFEB.EE8BFA20" alt="cid:489575314@22072009-0ABB"><br>
<b> <br>
NICK CATON, E.I.T.<br>
</b>PROJECT ENGINEER<br>
25501 west valley parkway<br>
olathe ks 66061<br>
direct 913 344.0036<br>
fax 913 345.0617<br>
<i>Check out our new web-site @ </i><a href="www.smithboucher.htm">www.smithboucher.com</a><u>
<br>
</u> <br>
<b>From:</b> Scott Criswell [<a href="mailto:scott.criswell@doe2.com">
mailto:scott.criswell@doe2.com</a>] <br>
<b>Sent:</b> Tuesday, October 27, 2009 11:09 AM<br>
<b>To:</b> Rosenberg, Michael I<br>
<b>Cc:</b> ashu gupta; Nick Caton; Crockett, Jim; Kendra Tupper;
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
I can confirm Mike's understanding of the DOE-2/eQUEST results. To get
the correct number of hours of unmet loads, people should MULTIPLY the Percent
hours outside throttling range from BEPS or BEPU by the total annual
"hours fans on" listed in report SS-E.<br>
<br>
One other comment re: Ashu's write-up - I believe that (for DOE-2/eQUEST) a
zone temperature has to be more than one degree outside the throttling range
for that hour to be counted as an hour outside throttling range. So for a
zone with a heating thermostat setpoint of 72 and a 2 degree throttling range
(=> 71-73 degree "throttling range"), the zone temperature would
have to be LESS THAN 70 in order for that hour to be counted.<br>
<br>
related info -<br>
We are contemplating a change to the Air-Side HVAC Summary view in the eQUEST
interface to report this total number of hours as opposed to just the percent
in the totals section at the bottom of the report.<br>
We have also just in the past several days (thanks to the efforts of Steve
Gates) added precision to the percent hours outside throttling range reported
on BEPS & BEPU and ALSO added separate reporting of hours any zone is
either under cooled or under heated, intended for reporting to LEED submission
templates. Assuming no further changes (which is certainly not out of the
question), future releases of DOE-2/eQUEST will report the following in the
BEPS & BEPU reports:<br>
<tt><span style='font-size:10.0pt'>
PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE = 4.45</span></tt><br>
<tt><span style='font-size:10.0pt'>
PERCENT OF HOURS ANY PLANT LOAD NOT
SATISFIED
= 0.00</span></tt><br>
<tt><span style='font-size:10.0pt'>
HOURS ANY ZONE ABOVE COOLING THROTTLING
RANGE
= 98</span></tt><br>
<tt><span style='font-size:10.0pt'>
HOURS ANY ZONE BELOW HEATING THROTTLING
RANGE
= 25</span></tt><br>
<br>
- Scott<br>
<br>
<br>
Rosenberg, Michael I wrote: <br>
Ashu,<br>
<br>
I am in agreement with everything you stated except possibly this;<br>
<br>
“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)”<br>
<br>
My understanding is that some simulation programs (DOE2 and eQuest in
particular) report this as a percentage of hours that the fan is running. I
could be wrong, and I am sure some of you DOE2 experts can comment on what is
reported in the DOE2 BEPS report.<br>
<br>
Mike<br>
<br>
<br>
<b>__________________________</b> <br>
<b>Michael Rosenberg</b> <br>
Senior Commercial Buildings Energy Analyst <br>
ENERGY & ENVIRONMENT DIRECTORATE <br>
Pacific Northwest National Laboratory <br>
2032 Todd Street <br>
Eugene, OR 97405 <br>
(541) 844-1960 <br>
<a href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a> <br>
<a href="http://www.pnl.gov/">www.pnl.gov</a> <br>
<b>From:</b> ashu gupta [<a href="mailto:kce2@kamalcogentenergy.com">
mailto:kce2@kamalcogentenergy.com</a>] <br>
<b>Sent:</b> Monday, October 26, 2009 10:17 PM<br>
<b>To:</b> Rosenberg, Michael I; 'Nick Caton'; 'Crockett, Jim'; 'Kendra Tupper'<br>
<b>Cc:</b> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
Dear All,<br>
<br>
Explanation of Unmet Hours is as follows:<br>
<br>
<b>Unmet Hours:<br>
</b>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.<br>
<br>
<b>Understanding/Interpreting/Calculating the number of unmet hours:</b> <o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1'>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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1'>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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo1'>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>(Example: <br>
Visual DOE: “SS-J System Peak Heating and Cooling Days” report &<br>
Energy Plus: Output Variable, “Time Cooling Set point Not met”) <o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l1 level1 lfo2'>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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l1 level1 lfo2'>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><i>Example: <br>
</i>When each zone is unmet in the specified hours as beside,<br>
<br>
Zone 1 unmet
during:
6
8
14 16<br>
Zone 2 unmet
during:
6
8
12 16<br>
Zone 3 unmet
during:
7
8
12 13<br>
<br>
Total number of unmet hours of the building: <b>7 hrs</b> and not 12hrs.<br>
6 7
8
12
13
14 16<br>
<o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo3'>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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo3'>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='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo3'>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> <br>
<br>
Thanks<br>
<br>
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>
<a href="mailto:kce2@kamalcogentenergy.com">kce2@kamalcogentenergy.com</a> <br>
<a href="http://www.kamalcogentenergy.com/">www.kamalcogentenergy.com</a><o:p></o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b>From:</b> <a
href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">
mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <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> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
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.<br>
<br>
<b>__________________________</b> <br>
<b>Michael Rosenberg</b> <br>
Senior Commercial Buildings Energy Analyst <br>
ENERGY & ENVIRONMENT DIRECTORATE <br>
Pacific Northwest National Laboratory <br>
2032 Todd Street <br>
Eugene, OR 97405 <br>
(541) 844-1960 <br>
<a href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a> <br>
<a href="http://www.pnl.gov/">www.pnl.gov</a> <br>
<b>From:</b> Nick Caton [<a href="mailto:ncaton@smithboucher.com">
mailto:ncaton@smithboucher.com</a>] <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> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
Mike,<br>
<br>
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>. <br>
<br>
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. <br>
<br>
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. <br>
<br>
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.<br>
<br>
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!<br>
<br>
~Nick<br>
<br>
<img border=0 width=119 height=37 id="_x0000_i1029"
src="cid:image001.jpg@01CADFEB.EE8BFA20" alt="cid:489575314@22072009-0ABB"><br>
<b> <br>
NICK CATON, E.I.T.<br>
</b>PROJECT ENGINEER<br>
25501 west valley parkway<br>
olathe ks 66061<br>
direct 913 344.0036<br>
fax 913 345.0617<br>
<i>Check out our new web-site @ </i><a href="www.smithboucher.htm">www.smithboucher.com</a><u>
<br>
</u> <br>
<b>From:</b> Rosenberg, Michael I [<a href="mailto:michael.rosenberg@pnl.gov">
mailto:michael.rosenberg@pnl.gov</a>] <br>
<b>Sent:</b> Monday, October 26, 2009 7:39 PM<br>
<b>To:</b> Nick Caton; Crockett, Jim; <a
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
Nick,<br>
<br>
Your interpretation is the correct one. According to the definitions in
Standard 90.1.<br>
<b><i>unmet load hour:</i></b> an hour in which one or more zones is outside of
the thermostat setpoint range.<br>
<br>
<br>
Mike<br>
<b>__________________________</b> <br>
<b>Michael Rosenberg</b> <br>
Senior Commercial Buildings Energy Analyst <br>
ENERGY & ENVIRONMENT DIRECTORATE <br>
Pacific Northwest National Laboratory <br>
2032 Todd Street <br>
Eugene, OR 97405 <br>
(541) 844-1960 <br>
<a href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a> <br>
<a href="http://www.pnl.gov/">www.pnl.gov</a> <br>
<b>From:</b> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a href="mailto:bldg-sim-bounces@lists.onebuilding.org"> mailto:bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Monday, October 26, 2009 5:33 PM<br>
<b>To:</b> Crockett, Jim; <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
Jim,<br>
<br>
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.<br>
<br>
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. <br>
<br>
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!<br>
<br>
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).<br>
<br>
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).<br>
<br>
<img border=0 width=119 height=37 id="_x0000_i1030"
src="cid:image001.jpg@01CADFEB.EE8BFA20" alt="cid:489575314@22072009-0ABB"><br>
<b> <br>
NICK CATON, E.I.T.<br>
</b>PROJECT ENGINEER<br>
25501 west valley parkway<br>
olathe ks 66061<br>
direct 913 344.0036<br>
fax 913 345.0617<br>
<i>Check out our new web-site @ </i><a href="www.smithboucher.htm">www.smithboucher.com</a><u>
<br>
</u> <br>
<b>From:</b> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">
mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Crockett,
Jim<br>
<b>Sent:</b> Monday, October 26, 2009 4:27 PM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Ashrae 90.1 - Unmet hours<br>
<br>
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?<br>
<br>
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.<br>
<br>
Have any of you run into this? Is it addressed in an addendum somewhere,
etc?<br>
<br>
Any help is appreciated. Thanks,<br>
<br>
<br>
<br>
Jim Crockett, P.E.<br>
<br>
Senior Project Engineer<br>
Energy & Carbon Management<br>
Nexant, Inc.<br>
4021 S. 700 E., Suite 250<br>
Salt Lake City, Utah 84107<br>
<br>
(801) 639-5603 - phone<br>
(801) 266-4786 - fax<br>
<o:p></o:p></p>
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<p style='margin-bottom:12.0pt'><br>
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