My two cents...<br><br>The same OSA for baseline vs as-designed makes sense for occupant-required OSA, such that there is no reward for compromising occupant health to gain LEED points.<br><br>However, that fraction of the fumehood OSA over and above occupancy-required is <b><i>process</i></b> OSA, an opportunity where LEED <i><b>should </b></i>be encouraging savings. Now I'm not saying they do, just that they <i><b>should...</b></i><br>
<br>And after rereading the requirements it shakes out that LEED really doesn't give credit for reducing process outside air loads, keep the parametric run in your model -- the local utility may see things differently, and 'recognize you' with a big fat rebate check.<br>
<br>Cheers<br><br>Brandon Nichols<br>BW Nichols PE<br>Seattle WA<br>206-228-8707<br><br><div class="gmail_quote">On Fri, Nov 7, 2008 at 11:53 AM, Michael Tillou <span dir="ltr"><<a href="mailto:michael.tillou@gmail.com">michael.tillou@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div vlink="purple" link="blue" lang="EN-US">
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">You are correct that Appendix G requires outside air to be
the same for both as-designed and baseline models. You would not be able
to claim savings for reduced ventilation airflow from a more efficient fume
hood. Similarly you cannot claim credit for reduced ventilation
airflow on displacement ventilation and UFAD systems. </font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">However I see no reason why you wouldn't be able to claim
the fan energy savings associated with a more efficient fume
hood.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">Mike</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span>
<div align="left"><font size="2" face="Arial Black">Michael Tillou, PE,
LEED</font></div>
<div align="left"><font size="2" face="Arial Black">Tillou Engineering,
LLC</font></div>
<div align="left"><font size="1" face="Arial Black">Williamstown, MA
01267</font></div>
<div align="left"><font size="1" face="Arial Black">P:
413-458-9870</font> <font size="1" face="Arial Black">C:
413-652-1087</font></div></span></div>
<div dir="ltr" align="left" lang="en-us">
<hr>
<font size="2" face="Tahoma"><b>From:</b> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Bishop,
Bill<br><b>Sent:</b> Friday, November 07, 2008 9:04 AM<br><b>To:</b>
<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br><b>Subject:</b> [Bldg-sim] Exhaust, outside
air and infiltration for LEED<br></font><br></div><div><div></div><div class="Wj3C7c">
<div></div>
<div>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">The mechanical engineer for a campus
laboratory building with 100% OA wants to claim energy savings for reduced
exhaust from more efficient fume hoods. (Established design practice uses hoods
with 100 fpm flow – they are installing 70 fpm hoods. This reduces peak exhaust
from 700 to 490 CFM per hood.) My approach has always been to keep outside air,
exhaust and infiltration flows identical between the proposed and baseline
models (except for DCV). (This was not easy for this model with proposed VAV and
baseline constant volume packaged rooftops.)</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Has anybody successfully claimed
OA/exhaust/infiltration savings for a LEED project?</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Thanks,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Bill</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
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</span></font></b><b><font color="black" size="2" face="Franklin Gothic Medium Cond"><span style="font-weight: bold; font-size: 10pt; color: black;">Pathfinder
Engineers LLP</span></font></b></p>
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