I've had many comments. They have changed their perspective as the rating authority and are requiring outside air treatment procedures that are outside of ASHRAE 90.1 section G procedures. Typically design outside air volume is the same between the baseline and proposed, but if you are using DCV they now require you to model the baseline with the minimum ASHRAE 62.1 volume. So, if you have greater OA volume in your proposed model, you may be penalized depending on your DCV method and diversity schedule for occupants in the area with DCV control.<br>
<br>Here is an example clarification question:<br><br><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 12"><meta name="Originator" content="Microsoft Word 12"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5Ctserra%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml"><link rel="themeData" href="file:///C:%5CDOCUME%7E1%5Ctserra%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx"><link rel="colorSchemeMapping" href="file:///C:%5CDOCUME%7E1%5Ctserra%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml"><style>
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<p class="MsoListParagraphCxSpFirst" style="margin-left: 0.25in; text-indent: -0.25in;"><b style=""><span style=""><span style="">1.<span style="font: 7pt "Times New Roman";">
</span></span></span></b><b style=""><span style="background: none repeat scroll 0% 0% yellow;">CLARIFY:</span></b><span style="background: none repeat scroll 0% 0% yellow;"><span style="">
</span></span>Demand control ventilation was modeled for credit for RTU1 and
RTU2 in the Proposed case as indicated in Table 1.4 of the Template; however,
the outdoor air volume for RTU1 and RTU2 in the Baseline model was not modeled
at the ASHRAE 62.1-2004 minimum rates (1,066 cfm for each RTU) as determined in
EQp1: Minimum IAQ Performance. Appendix G allows schedule changes for demand
control ventilation as approved by the rating authority (Table
G3.1.4(Baseline)). As the rating authority, GBCI requires that the outside air
ventilation rates for the Baseline Case be modeled using minimum ASHRAE
62.1-2004 rates wherever credit is taken for demand control ventilation in the
Proposed Case. The Proposed case minimum rates at design conditions must be modeled
as designed.</p>
<p class="MsoListParagraphCxSpLast" style="margin-left: 0.25in;"> </p>
<b style=""><span style="font-size: 11pt; line-height: 115%; font-family: "Calibri","sans-serif";">TECHNICAL ADVICE:</span></b><span style="font-size: 11pt; line-height: 115%; font-family: "Calibri","sans-serif";"><span style=""> </span>Revise the Baseline model so the minimum
outdoor air volume is modeled at 1,066 cfm for RTU1 and RTU2 in the Baseline
model. In addition, provide revised SV-A reports for RTU1 and RTU2 reflecting
the changes. Further, verify that all systems in both the Baseline and Proposed
case are modeled with zero outside air flow when fans are cycled on to meet
unoccupied setback temperatures unless health or safety regulations mandate an
alternate minimum flow during unoccupied periods (in which case, the unoccupied
outside air rates must be modeled identically in the Baseline and Proposed
Case).</span><br><br><br clear="all">Thomas Serra<br>Project Manager<br>EMO Energy Solutions, LLC<br>3141 Fairview Park Drive, Suite 450<br>Falls Church, VA 22042<br>voice 703-205-0445 ex-113<br>fax 703-205-0449<br><br>