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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>Since we are on this topic, I had a question on definition of occupancy.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>I havn’t read the standard in detail, but isn’t there
a requirement of some OA/sqft in addition to OA/person. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>Let’s assume that an office is assumed normally occupied
from 8 am to 6 pm - Then during unoccupied hours (6.01 pm to 7.59 am) can
the OA be zero or should it be OA per sqft?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>More tricky, let’s say we have a occupancy sensor and know
that the office is unoccupied from 12.00 pm to 3 pm (during the regular office
times). What is the OA at this time – 0 or OA/sqft?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'>-rohini<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#993366'><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>Nick Caton<br>
<b>Sent:</b> Thursday, November 12, 2009 11:36 AM<br>
<b>To:</b> Guin, Michael; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum
outdoorairsupply<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>No.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Refer to Section 5.4: <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>“Mechanical ventilation
systems shall include controls, manual or automatic, that enable the fan system
to operate whenever <u>the spaces served are occupied</u>. The system
shall be designed to maintain the minimum outdoor airflow as required by
Section 6 <u>under any load condition</u>.” <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In summary, you must provided the minimum ventilation rate as
prescribed in Chapter 6 only when (A) the space is occupied and (B)
there’s a thermal load condition (or manual control – see Section
5.4) triggering the operation of the ventilation system.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Your original question is confusing to at least a few of us
because of stating an office ceases to be a “zone” at night…
It’s a terminology thing, but 62.1 and other standards will become
more digestible to you when you recognize that’s not the case. The
clarification we’re making here is that where a zone occupancy (i.e.
“office”) is decided and a constant over time, something like “occupancy
rate” can be variable.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’d like to also point out, based on your first inquiry,
that the equation at 6.2.2.1 uses <u>maximum</u> zone occupancy to establish
the minimum design OA rate, not the hourly occupancy rate (which may be zero).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CA6390.FE6A4BE0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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>Guin,
Michael<br>
<b>Sent:</b> Thursday, November 12, 2009 8:44 AM<br>
<b>To:</b> Shawn.Lee@fluor.com<br>
<b>Cc:</b> bldg-sim-bounces@lists.onebuilding.org;
bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum outdoor
airsupply<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>is
there any requirement to provide minimum outdoor fresh air wihin the office
space when it is unoccupied according to ASHRAE 62.1</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Do
you think it it clear enough? </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Michael</span><o:p></o:p></p>
</div>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><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"'> Shawn.Lee@fluor.com
[mailto:Shawn.Lee@fluor.com] <br>
<b>Sent:</b> 12 November 2009 13:58<br>
<b>To:</b> Guin, Michael<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org;
bldg-sim-bounces@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum outdoor air
supply</span><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Michael,</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Technically
answering your question may not help you much. You need to make the
question clearer and more meaningful. Tell people what you are trying to
do, what is in your mind, and what you are trying to accomplish. Then
this group may help you more on the target.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Shawn Lee, PhD,
PE</span> <br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>"Guin,
Michael" <Michael.Guin@WSPGroup.com></span></b> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Sent by:
bldg-sim-bounces@lists.onebuilding.org</span> <br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>11/12/2009
06:09 AM</span> <o:p></o:p></p>
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style='font-size:7.5pt;font-family:"Arial","sans-serif"'>To</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><bldg-sim@lists.onebuilding.org></span>
<o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><span
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>[Bldg-sim]
ASHRAE 62.1 unoccupied space minimum outdoor air supply</span> <o:p></o:p></p>
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<o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Dear all,</span>
<o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ASHARE 62.1
2007 deifned zone as an occupied space. Table 6-1 provides the calculation for different
spaces based on occupancy and floor area of the occupied space.</span> <o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If we
consider an unoccupied office space at night (i.e. not strictly a "zone
anymore" ); is there any requirement to provide minimum fresh air
wihin the office space. </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks in advance
for your help</span> <span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
Michael </span> <o:p></o:p></p>
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