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Interesting thread. We should keep in mind the difference between pass/fail
"compliance" using the performance ECB method in 90.1 (where only ASHRAE
instructions apply), and LEED energy savings calculations which use the EMP,
CIRs, and perhaps DCV as part of our little world of alphabet soup. <br>
<br>
Marcus Sheffer wrote:<br>
<blockquote type="cite"
cite="midMDAEMON-F200306021101.AA0106625pd80000466481@gard.com"> We will
be submitting some shortly and this is how we have interpreted the CIRs.
Schedule changes are acceptable is my understanding. The adopting authority
in this case is the USGBC and they have stated that schedule changes are
allowable for DCV. To be 100% sure, develop your methodology for calculating
savings and submit it as a CIR.<br>
<br>
At 11:47 AM 06/02/2003 -0400, you wrote:<br>
<blockquote type="cite" class="cite" cite=""><font face="arial"
size="2">Thanks for your reply.</font><br>
<br>
<font face="arial" size="2">I re-read a CIR from 6/7/2001 (perhaps the one
to which you are referring?) to be sure that I hadn't missed anything. In
the Project Manager's Ruling, it says:"Under the ECM [Exceptional Calculation
Method], schedule variations may be used as a basis of engineering calculations
for discrete measures that are precluded by the reference standard or the
LEEDTM EMP."</font><br>
<br>
<font face="arial" size="2">However, the description of the ECM in section
11.5 of the 90.1 manual states that the applicant must provide documentation
supporting the accuracy of the exceptional method and that "This documentation
must also show that the methods and its results:</font><br>
<font face="arial" size="2">1. Do not change the simulation program input
parameters that are constrained by the ECM method or any other rules of the
adopting authority. For example, the exceptional method may not violate
the rule against using different operating schedules for proposed and budget
runs."</font><br>
<br>
<font face="arial" size="2">So it is still unclear to me whether or not schedule
changes are acceptable. Have you successfully proposed schedule changes
such as these through the ECM process?</font>
<dl>
<dd>----- Original Message ----- </dd>
<dd>From: <a href="mailto:sheffer@paonline.com">Marcus Sheffer</a>
</dd>
<dd>To: <a href="mailto:wmclaughlin@dmiinc.com">wmclaughlin@dmiinc.com</a>
</dd>
<dd>Cc: <a href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</a> </dd>
<dd>Sent: Monday, June 02, 2003 11:04 AM </dd>
<dd>Subject: Re: [BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question<br>
<br>
</dd>
<dd>I'd suggest you review the CIRs more closely. DCV has been approved
as an energy saving measure and you can modify schedules to simulate savings.
You must follow the Exceptional Calculation Method (section 11.5) of the
Energy Cost Budget Method of 90.1.<br>
<br>
</dd>
<dd>At 10:14 AM 06/02/2003 -0400, you wrote:
<blockquote type="cite" class="cite" cite=""><font face="arial"
size="2"> <dd>Hi All,</dd>
</font> <dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">We are currently working on our
first LEED certification project. We use PowerDOE as a modeling tool, but
these questions should apply to all modeling platforms.</font> </dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">The LEED process requires modeling
practices to follow those outlined in the ASHRAE 90.1 Standard User's Manual.
The standard does not allow for the augmentation of schedules to model efficiency
measures. This is a problem for us in that we often use schedules to simulate
measures such as lighting occupancy sensors and demand controlled ventilation.</font>
</dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">Typically:</font><font
face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">-For lighting occupancy sensors,
we adjust our known office schedules using a profile taken from the JIES
(I'm afraid I don't have the specific source in front of me).</font><font
face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">-For demand controlled ventilation,
we develop an hourly outside air Fraction of Design schedule for each AHU
using known occupancy schedules and an assumption of 20 CFM per occupant.</font>
</dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">To us, both of these methods seem
to be accepted modeling practice for determining measure performance. However,
as stated pretty explicitly in the archived credit interpretation requests
(CIRs) on the LEED site, LEED won't allow for the adjustment of schedules
to simulate these measures. Does anyone have a method (or insight into developing
a method) for either of these calculations in a manner that would be acceptable
for the LEED process?</font> </dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">Many thanks in advance for your
responses.</font> </dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">Wade</font> </dd>
<dd> <font face="arial" size="2"> </font></dd>
<dd><font face="arial" size="2">Wade McLaughlin </font></dd>
<dd><font face="arial" size="2">DMI </font></dd>
<dd><font face="arial" size="2">450 Lexington St. </font></dd>
<dd><font face="arial" size="2">Newton, MA 02466 </font></dd>
<dd><font face="arial" size="2">p 617-527-1525 x103 </font></dd>
<dd><font face="arial" size="2">f 617-527-6606</font><br>
<br>
<br>
<br>
<pre>
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</dd>
</blockquote>
<font face="Abadi MT Condensed Light" size="4" color="#008000"> </font></dd>
<dd><font face="Abadi MT Condensed Light" size="4" color="#008000">Marcus
B. Sheffer energy & environmental consulting
</font></dd>
<dd><font face="Abadi MT Condensed Light" size="4" color="#008000">Energy
Opportunities 717-292-2636 </font></dd>
<dd><font face="Abadi MT Condensed Light" size="4" color="#008000">1200
E Camping Area Road Fax: 717-292-0585 </font></dd>
<dd><font face="Abadi MT Condensed Light" size="4" color="#008000">Wellsville,
PA USA 17365-9783 <a class="moz-txt-link-abbreviated" href="mailto:sheffer@sevengroup.com">sheffer@sevengroup.com</a> </font></dd>
<dd><font face="Abadi MT Condensed Light" size="4" color="#008000">a
Seven Group member company <a href="http://www.sevengroup.com/"
eudora="autourl"><u>www.sevengroup.com</u></a></font></dd>
</dl>
</blockquote>
<x-sigsep></x-sigsep>
<p> <font face="Abadi MT Condensed Light" size="4" color="#008000">Marcus
B. Sheffer energy & environmental consulting<br>
Energy Opportunities 717-292-2636<br>
1200 E Camping Area Road Fax: 717-292-0585 <br>
Wellsville, PA USA 17365-9783 <a class="moz-txt-link-abbreviated" href="mailto:sheffer@sevengroup.com">sheffer@sevengroup.com</a><br>
a Seven Group member company <a href="http://www.sevengroup.com/"
eudora="autourl"><u>www.sevengroup.com</u></a><u><br>
</u></font></p>
</blockquote>
<br>
<pre class="moz-signature" cols="$mailwrapcol">--
Fred W. Porter
Senior Engineer
Architectural Energy Corp.
2540 Frontier Ave. Suite 201
Boulder CO 80301
email: <a class="moz-txt-link-abbreviated" href="mailto:fporter@archenergy.com">fporter@archenergy.com</a>
fax: 303-444-4304
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