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<p class=MsoNormal><span style='color:#1F497D'>I know this is a contentious
issue on bldg-sim regarding whether this should be a allowable measure or not. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I can tell you that on a recent
office building project (LEED-NC v2.2) we submitted for energy savings from
garage CO sensors. The only comment we got from the reviewer was that “ASHRAE
mandates some sort of timed control or CO control as part of the mandatory
measures,” so we couldn’t compare against a 24/7 constant volume
system. I wish they had quoted a specific section of 90.1 for clarity. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>We switched the baseline system
to be off for ~6 hours during the night (not in agreement with the IMC
requirement for continuous air movement), and they accepted our energy savings.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Our proposed case simply had the
fans on a VFD and we created a custom schedule, which we presented to the
reviewer, to reflect that the fans typically were at their lowest setting, and
only ramped up for peak commuting hours (small peaks for morning and lunch, big
peak at end of the day when all the cold engines start up and really put out
the CO). <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>It is unclear to me if you are modeling
a residential garage, where there may genuinely be 24/7 use, if you get to compare
to a 24/7 constant volume system. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Franklin Gothic Demi","sans-serif";
color:#1F497D'>Nathan Miller</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>Senior Energy Engineer/Mechanical Engineer<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>direct: 206.788.4577<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>fax: 206.285.7111 </span><span style='color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James
Hansen<br>
<b>Sent:</b> Thursday, November 12, 2009 8:09 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] GBCI approval of carbon monoxide control of garage
fans?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone know if the GBCI reviewers are currently
accepting ECMs based off of garage carbon monoxide sensors to index garage
fans? Or if this can actually be included in the model with appropriate
explanation?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>IMC requires constant ventilation for enclosed garages, but
allows CO-based systems to activate the fans. This equates to a
substantial energy savings since most systems like this only operate a few hours
in the morning, evening, and at lunch (other than the minimum 0.05 cfm / sq ft
continuous ventilation required by the IMC).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If we explain the system, and explain our assumptions for
the use schedules that dictate the proposed building fan schedules for the
garage, is this acceptable?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Do they require any backup support/studies for exactly how
often the CO levels will rise above acceptable limits, or is it sufficient to
make a conservative assumption that the garage fans will operate from 7-9am,
11-1pm, and 4-6pm at full load? In my engineering experience, CO-based
systems rarely run, and the circulation fans throughout the garage (which
approximate the continuous 0.05 cfm / sq ft requirements of the IMC CO-based
systems) are what really prevent isolated CO buildup.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns15:PersonName><span
style='color:black'>James Hansen</span></ns15:PersonName></span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'>,
PE, LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
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