<div dir="ltr">Joe,<div><br></div><div>Your last bit there about taking credit for constant OA flow from full-load to part-load conditions on a VAV system is a bit of a red flag for me. The Baseline system should be minimally compliant with ASHRAE 62.1. ASHRAE 62.1 section 6.2.6.1 requires that ventilation systems shall be designed to be capable of providing the required ventilation rates in the breathing zone including all full- and part-load conditions. Outside of Demand Control Ventilation scenarios, I would always expect the Baseline and Proposed case to deliver the same outside airflow at all hours.</div>
<div><br></div><div>That being said, I'm not certain how you're actually getting a credit for what you're saying. What input are you modifying in eQUEST to accomplish proportional outside air flow control?</div>
<div><br></div><div>-Robby</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Mar 6, 2014 at 1:48 PM, Joseph Lewis <span dir="ltr"><<a href="mailto:jlewis@fortierengineering.com" target="_blank">jlewis@fortierengineering.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div dir="ltr">
<div style="font-size:12pt;font-family:'Calibri'">
<div>You are going to follow 90.1 Appendix G for the model. This means
both the baseline and proposed design outdoor air flow rates will need to be the
same except if you are using demand control ventilation in the proposed and it
is not required by 90.1 section 6.</div>
<div> </div>
<div>In the case where you have demand controlled ventilation in the proposed
and it is not required in the baseline then the USGBC has stated that they would
like the baseline to be modeled as compliant with 62.1 without the system level
corrections. There also should not be any temperature difference
corrections because the other appendix G rules require your CFM sizing to be
based up on a 20 °F delta T.</div>
<div> </div>
<div>If demand controlled ventilation is required by 90.1 then it must be
modeled in the baseline and proposed with the same design flow.</div>
<div> </div>
<div>I personally take credit on my models for where the proposed VAV system has
controls to maintain a constant OA flow across from design to minimum supply, by
modeling the baseline as just proportional. I have not been flagged for
it, but I also have not found any definitive ruling that what I am doing is
allowed. </div>
<div> </div>
<div>Joe Lewis</div>
<div>Fortier Engineering</div>
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<div><b>From:</b> <a title="JoeC@designengineers.com" href="mailto:JoeC@designengineers.com" target="_blank">Joe Chappell</a> </div>
<div><b>Sent:</b> Thursday, March 06, 2014 3:50 PM</div>
<div><b>To:</b> <a title="equest-users@lists.onebuilding.org" href="mailto:equest-users@lists.onebuilding.org" target="_blank">mailto:equest-users@lists.onebuilding.org</a>
</div>
<div><b>Subject:</b> [Equest-users] LEED Increased Ventilation Credit and Energy
Modeling</div></div></div>
<div> </div></div><div><div class="h5">
<div style="font-style:normal;font-size:small;display:inline;font-family:"Calibri";text-decoration:none;font-weight:normal">
<div>
<p class="MsoNormal">Good day,<u></u><u></u></p>
<p class="MsoNormal"><u></u><u></u> </p>
<p class="MsoNormal">I have a question regarding the LEED credit for Increased
Ventilation (IEQc2). This is the credit awarded for exceeding ventilation
in all spaces by 30% beyond the ASHRAE standard 62.1 requirements. It
seems obvious that the design model ventilation rates would be those 30% higher
than 62.1 requirements. What then would the baseline model ventilation
rates be? <u></u><u></u></p>
<p class="MsoNormal"><u></u><u></u> </p>
<p class="MsoNormal">If you strictly follow 90.1 Appendix G, you should always
model baseline and proposed equivalent except for when taking credit for demand
controlled ventilation. However, it seems in this case that it could also
be argued (by LEED) that you should model the ASHRAE 62.1 required ventilation
rates in the baseline model, not those that are 30% higher and therefore pay the
energy expense( most climates) for increased outside air.<u></u><u></u></p>
<p class="MsoNormal"><u></u><u></u> </p>
<p class="MsoNormal">Does anyone have any experience with LEED on this
issue? Thanks in advance.<u></u><u></u></p>
<p class="MsoNormal"><u></u><u></u> </p>
<p class="MsoNormal">Kind regards,<u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Arial","sans-serif"">Joe
Chappell</span></b><span style="font-size:10pt;font-family:"Arial","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><u></u><u></u> </p></div></div></div></div></div></div></div>
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