<html>
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>From:</b> <a href="mailto:sheffer@paonline.com">Marcus Sheffer</a>
<dd>To:</b>
<a href="mailto:wmclaughlin@dmiinc.com">wmclaughlin@dmiinc.com</a>
<dd>Cc:</b> <a href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</a>
<dd>Sent:</b> Monday, June 02, 2003 11:04 AM
<dd>Subject:</b> Re: [BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question<br>
<br>
<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>At 10:14 AM 06/02/2003 -0400, you wrote:<blockquote type=cite class=cite cite><font face="arial" size=2>
<dd>Hi All,</font>
<dd> <font face="arial" size=2>
<dd>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> <font face="arial" size=2>
<dd>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> <font face="arial" size=2>
<dd>Typically:</font><font face="arial" size=2>
<dd>-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>
<dd>-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> <font face="arial" size=2>
<dd>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> <font face="arial" size=2>
<dd>Many thanks in advance for your responses.</font>
<dd> <font face="arial" size=2>
<dd>Wade</font>
<dd> <font face="arial" size=2>
<dd>Wade McLaughlin
<dd>DMI
<dd>450 Lexington St.
<dd>Newton, MA 02466
<dd>p 617-527-1525 x103
<dd>f 617-527-6606</font><br>
<br>
<br>
<br>
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</pre><font face="Courier New, Courier"></font></blockquote><font face="Abadi MT Condensed Light" size=4 color="#008000">
<dd>Marcus B. Sheffer energy & environmental consulting
<dd>Energy Opportunities 717-292-2636
<dd>1200 E Camping Area Road Fax: 717-292-0585
<dd>Wellsville, PA USA 17365-9783 sheffer@sevengroup.com
<dd>a Seven Group member company <a href="http://www.sevengroup.com/" eudora="autourl"><u>www.sevengroup.com</a></u></font></blockquote>
<x-sigsep><p></x-sigsep>
</dl><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 sheffer@sevengroup.com<br>
a Seven Group member company <a href="http://www.sevengroup.com/" eudora="autourl"><u>www.sevengroup.com</a><br>
</font></u></html>