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<font size="+1"><tt>I'm not sure how the credit is obtained but the
logic to using a CO2 monitor is so you don't have to provide
full 62.1 fresh air rates for maximum people counts. OA is
expensive to condition. The idea of the CO2 sensor is to get a
reading on the actual people count and provide fresh air
accordingly. I don't see the logic to provide a sensor and not
use it or put one on a system where you can't use it. Using the
CO2 sensor requires a more complex system, hence more cost. The
only way to recover the extra cost is by reducing the amount of
fresh air you condition. You don't get much of a payback if
your building people count doesn't vary much and they spend all
their time in the same location. A simple schedule will deal
with that. If your building has a lot of variability a CO2
sensors can save quite a bit on operating costs and keep the
occupants happier as well.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
</tt></font><br>
On 26/10/2011 02:13 PM, Sundharam, Premnath wrote:
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<p class="MsoNormal"><span style="color:#1F497D">Hey Robert,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">My
understanding of the CO2 monitoring credit is that it ONLY
requires that you provide capabilities to monitor CO2 and
not necessarily vary the amount of outside air. So if your
HVAC equipment cannot vary the amount of OA you could still
provide CO2 sensors that report the CO2 levels.<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">Everyone else:
is this what your understanding as well?<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">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Prem<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:black">Premnath
Sundharam, AIA, LEED AP BD+C</span></b><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Architect
| Senior Associate<o:p></o:p></span></p>
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href="mailto:psundharam@dlrgroup.com"><span
style="color:#4D4D4D">psundharam@dlrgroup.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-family:"Arial","sans-serif";color:black">DLR
Group</span></b><span
style="font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Architecture
Engineering Planning Interiors<o:p></o:p></span></p>
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<p class="MsoNormal"><span
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<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"">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On
Behalf Of </b>Robert E. O'Connell<br>
<b>Sent:</b> Wednesday, October 26, 2011 11:06 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Co2 Monitoring<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Gentlemen I have a question regarding 90.1
when modeling a space. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The design we are using for a project is to
provide minimum ventilation (as called for in ASHRAE
62.1-2007) to all the spaces based on max occupancy. The
spaces are offices and conference rooms, one or two class
rooms. The heating and cooling load is provide in each space
by FCU. The make-up air is preconditioned to 55 Degree F.
The relief air passes through a heat recover unit to collect
the heat from the relief air. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If was are not varying the make-up air
quantity do we need to have CO2 monitoring in each space.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do you believe we would get any push back
from USGBC on this.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone dealt with this issue before. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Robert O'Connell P.E. <o:p></o:p></p>
<p class="MsoNormal">Email: <a moz-do-not-send="true"
href="mailto:reoconnell@meengineering.com">reoconnell@meengineering.com</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><br>
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