No documentation exists supporting the new method. GBCI is pulling the "rating authority" card and implementing their own requirements. I tried to argue my case that they are going against the procedure in ASHRAE, but they did not change their requirement. I have expressed my opinion that a document should be posted on the website that shows this new requirement but I have yet to see anything new. Otherwise you may be expecting savings from DCV that will be rejected and then the MEP or modeler will look foolish. They should have implemented a cut-off date for projects already in the system similar to the "District Thermal" change they made in May 2008.<br>
<br>In reality the DCV will still result in energy savings but the paper design savings will be lost. I believe GBCI and USGBC are trying to prevent "gaming" of the system. A designer could grossly oversize the ventilation system and then gain tremendous savings by implementing DCV. This new requirement forces the designer to pursue other ventilation strategies if they want to claim savings for DCV. Unfortunately the only way we are learning of this requirement is through clarification questions. This lack of communication is what really upsets me.<br>
<br>The only solution that I see is that all spaces with demand control ventilation should be designed to ASHRAE 62.1 minimums. Also, teams should not pursue the 30% increase ventilation credit. <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>
<br><br><div class="gmail_quote">On Mon, Jul 26, 2010 at 11:22 AM, Karen Walkerman <span dir="ltr"><<a href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>Can anyone find documentation requiring the baseline to use ASHRAE 62.1 ventilation rates? The table in EA Credit 1 under HVAC System Selection for the baseline design states:<br></div><div><br></div><div>"Outdoor ventilation rates should be identical to the proposed case"</div>
<div><br></div><div>There are no exceptions listed anywhere in the LEED documentation (I am currently looking at LEED 2009, but have reviewed this in the past under LEED 2.2).</div><div><br></div><div>We have had DCV be approved in the past with no questions.</div>
<div><br></div><div>--</div><div>Karen</div><br><div class="gmail_quote"><div><div></div><div class="h5">On Mon, Jul 26, 2010 at 11:08 AM, Tom Serra <span dir="ltr"><<a href="mailto:tserra@emoenergy.com" target="_blank">tserra@emoenergy.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div class="h5">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>
<p style="margin-left: 0.25in;"><b><span><span>1.<span style="font: 7pt "Times New Roman";">
</span></span></span></b><b><span style="background: none repeat scroll 0% 0% yellow;">CLARIFY:</span></b><span style="background: none repeat scroll 0% 0% yellow;"><span>
</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 style="margin-left: 0.25in;"> </p>
<b><span style="font-size: 11pt; line-height: 115%;">TECHNICAL ADVICE:</span></b><span style="font-size: 11pt; line-height: 115%;"><span> </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>
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