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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I may be wrong, but it appears a number of people aren’t
examining the equation in 6.2.2.1 as I’m suggesting. If you’ll
check that out I’m certain you’ll find this is a much simpler
question/answer than it’s being made out to be.<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><u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Both</span></u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> sets of figures provided in Table 6-1 (OA/person and OA/SF) are
used to determine the design minimum OA rate, using 6.2.2.1’s equation. Occupancy
has no effect on the OA/SF requirement, and likewise zonal area has no effect
on the OA/person requirement. Additionally, the occupancy figure used is
the <u>maximum</u> occupancy of that zone. Quoting 6.2.2.1: “Pz
= zone population: the largest number of people expected to occupy the zone
during typical usage…” It is not the hourly percentage
occupancy and is not zero unless the space is never normally occupied (as with
a storage room like Karen suggested).<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'>The design minimum OA rate is only applicable when the
ventilation system is operating. Unless I’m missing something
major, the ventilation system is not required by ASHRAE 62.1 to operate 24
hours per day (again, refer to Section 5.4, which I’ve copied entirely
below).<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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’ll try to break down the current questions/statements on
the table:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#003300'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#003300'>The reason I
had the question was because I think OA/sqft technically should not be
dependent on occupancy…</span><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'>That’s a fair judgement a designer is allowed to
make. The 62.1 Standard is just that – not a code, but a set of
suggestions provided by some of those best qualified to provide them. To
play the devil’s advocate, the counter-argument is that Occupancy cannot
be ignored by an energy-conscious ventilation system designer.<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;color:#003300'>…If that
was the case, it would suffice to just increase the OA/sqft and have only one
number to take care of.</span><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'>Someone doing that would be ignoring the equation Table 6-1 was
built around (re: 6.2.2.1). I’d agree that would be a
misinterpretation of the standard.<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;color:#003300'>What I am not
sure of is whether OA/sqft is used only during the typical occupied hours
irrespective of whether it is actually occupied or not or is it used
throughtout the day/weekend/vacation etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>OA/SF is always used alongside OA/person to determine the “breathing
zone outdoor airflow.” (Which I’ve been calling the design minimum
OA rate). The question of when these ventilation rates apply is tied to
when the zone is occupied. To restate my position (Again Ref: Section
5.4): ASHRAE 62.1 does not require that ventilation systems operate
during unoccupied times.<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;color:#003300'>What do the
hvac designers specify for the control of OA?</span><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'>Not sure whether a concise answer can be provided to this broad
question… OA ventilation <u>can</u> be controlled by any combination of scheduling/occupancy
sensing/timer control/temperature/humidity/VOC, CO2, CO or other air quality
sensors… all depending on the project budget, climate, and type of system
being designed. If this question had a simple answer, then we wouldn’t
need HVAC designers =).<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>what happens when you have a space that is almost NEVER
occupied, but has a cfm/sf requirement - like a storage room with a requirement
of 0.12 cfm/sf. <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'>See my answer above.<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>So do you need this ventilation rate only when the building
is occupied, only when the space is occupied, or all the time?<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Strictly speaking, only when the zone (space) is occupied.
If you have a one-zone system that doesn’t distinguish between occupancy
rates, then whenever the building is occupied.<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>If you only need the ventilation when the space is occupied,
and it is almost never occupied, why install the ventilation in the first
place?<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is a broad-scope question, so I’ll add another quote
under Section 1, entitled “PURPOSE:”<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>“1.1</span></b><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> The
purpose of this standard is to specify minimum ventilation rates and other
measures intended to provide indoor air quality that is acceptable to human
occupants ant that minimizes adverse health effects.”<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If a space is never occupied, then ASHRAE doesn’t care
about air quality. If a space is “almost never occupied,”
then they do. To continue your example, if you have a storage warehouse
with no ventilation installed, and it’s almost never occupied, someone
might eventually store something in that space that without ventilation would
eventually cause a health hazard to the next occupant entering the space.
In my college years, this was a commonly observed effect caused on a small
scale by my roommates forgetting food in the microwave =).<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><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><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@01CA6394.5AFD9BC0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<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"'> Karen Walkerman
[mailto:kwalkerman@gmail.com] <br>
<b>Sent:</b> Thursday, November 12, 2009 12:28 PM<br>
<b>To:</b> Brahme, Rohini UTRC<br>
<b>Cc:</b> Nick Caton; 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>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Ok, so here's a question - what
happens when you have a space that is almost NEVER occupied, but has a cfm/sf
requirement - like a storage room with a requirement of 0.12 cfm/sf. This
is a pretty high outdoor airflow, especially if you're just storing old files.<br>
<br>
So do you need this ventilation rate only when the building is occupied, only
when the space is occupied, or all the time?<br>
<br>
If you only need the ventilation when the space is occupied, and it is almost
never occupied, why install the ventilation in the first place?<br>
<br>
<br>
--<br>
Karen<br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal>On Thu, Nov 12, 2009 at 1:11 PM, Brahme, Rohini UTRC <<a
href="mailto:BrahmeR@utrc.utc.com">BrahmeR@utrc.utc.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#003300'>Thanks Nick. The reason I had the
question was because I think OA/sqft technically should not be dependent on
occupancy. If that was the case, it would suffice to just increase the OA/sqft
and have only one number to take care of. What I am not sure of is whether
OA/sqft is used only during the typical occupied hours irrespective of whether
it is actually occupied or not or is it used throughtout the
day/weekend/vacation etc. What do the hvac designers specify for the control of
OA?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#003300'>-rohini</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#003300'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> Nick
Caton [mailto:<a href="mailto:ncaton@smithboucher.com" target="_blank">ncaton@smithboucher.com</a>]
<br>
<b>Sent:</b> Thursday, November 12, 2009 12:22 PM<br>
<b>To:</b> Brahme, Rohini UTRC; <a href="mailto:bldg-sim@lists.onebuilding.org"
target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum outdoorairsupply</span><o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>You are correct. Refer to the
equation of Section 6.2.2.1 as I referenced below.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>It sounds like you’re asking the
same question I just answered, so I may not be understanding
completely… By Section 5.4 I do not believe an unoccupied space is
required to have any OA supplied. The equation in 6.2.2.1 does include a
component “per square foot,” but that equation is for determining
the design minimum OA rate.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Applying the same logic and the same
section, 5.4, if there are controls that automatically determine a space is
occupied and turn the associated system on to provide the required OA, then
there’s no reason those systems aren’t allowed to turn off while
unoccupied. Short answer for your example: 0.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>I’ll point out, I’m merely
an E.I.T. (with my head in the books) sharing my interpretations, so it may be
worth holding out for a second opinion =).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>~Nick</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=119 height=37
id="_x0000_i1025" src="cid:image001.jpg@01CA6394.5AFD9BC0"
alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'> </span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK
CATON, E.I.T.</span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>direct 913 344.0036</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>fax 913 345.0617</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span
style='font-size:10.0pt;color:#2D4D5E'>Check out our new web-site @ </span></i><span
style='font-size:11.0pt;color:#1F497D'><a href="http://www.smithboucher.com"
target="_blank" title="blocked::www.smithboucher.com"><span style='font-size:
10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;
color:blue'> </span></u><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <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>Brahme, Rohini UTRC<br>
<b>Sent:</b> Thursday, November 12, 2009 11:14 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> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum
outdoorairsupply</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#993366'>Since we are on this topic, I had a
question on definition of occupancy.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#993366'>Thanks</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#993366'>-rohini</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#993366'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <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>Nick Caton<br>
<b>Sent:</b> Thursday, November 12, 2009 11:36 AM<br>
<b>To:</b> Guin, Michael; <a href="mailto:bldg-sim@lists.onebuilding.org"
target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum
outdoorairsupply</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>No.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Refer to Section 5.4: </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-size:11.0pt;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>.” </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;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).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>~Nick</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=119 height=37
id="_x0000_i1026" src="cid:image001.jpg@01CA6394.5AFD9BC0"
alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'> </span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK
CATON, E.I.T.</span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>direct 913 344.0036</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;color:#2D4D5E'>fax 913 345.0617</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span
style='font-size:10.0pt;color:#2D4D5E'>Check out our new web-site @ </span></i><span
style='font-size:11.0pt;color:#1F497D'><a href="http://www.smithboucher.com"
target="_blank" title="blocked::www.smithboucher.com"><span style='font-size:
10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;
color:blue'> </span></u><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <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>Guin, Michael<br>
<b>Sent:</b> Thursday, November 12, 2009 8:44 AM<br>
<b>To:</b> <a href="mailto:Shawn.Lee@fluor.com" target="_blank">Shawn.Lee@fluor.com</a><br>
<b>Cc:</b> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org"
target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>; <a
href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE 62.1 unoccupied space minimum outdoor
airsupply</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt'>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 style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt'>Do you think it it clear enough? </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt'>Regards</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt'>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='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:Shawn.Lee@fluor.com" target="_blank">Shawn.Lee@fluor.com</a>
[mailto:<a href="mailto:Shawn.Lee@fluor.com" target="_blank">Shawn.Lee@fluor.com</a>]
<br>
<b>Sent:</b> 12 November 2009 13:58<br>
<b>To:</b> Guin, Michael<br>
<b>Cc:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a>;
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a><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='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt'>Michael,</span> <br>
<br>
<span style='font-size:10.0pt'>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'>Thanks.</span> <br>
<br>
<span style='font-size:10.0pt'>Shawn Lee, PhD, PE</span> <o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0 width="100%"
style='width:100.0%'>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'></td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:7.5pt'>"Guin, Michael" <Michael.Guin@WSPGroup.com></span></b>
<br>
<span style='font-size:7.5pt'>Sent by: <a
href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a></span>
<br>
<span style='font-size:7.5pt'>11/12/2009 06:09 AM</span> <o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<table class=MsoNormalTable border=0 cellpadding=0 width="100%"
style='width:100.0%'>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal align=right style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right'><span style='font-size:7.5pt'>To</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto'><span style='font-size:7.5pt'><<a
href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a>></span>
<o:p></o:p></p>
</td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal align=right style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right'><span style='font-size:7.5pt'>cc</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'></td>
</tr>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal align=right style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right'><span style='font-size:7.5pt'>Subject</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto'><span style='font-size:7.5pt'>[Bldg-sim] ASHRAE 62.1 unoccupied space
minimum outdoor air supply</span> <o:p></o:p></p>
</td>
</tr>
</table>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0>
<tr>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'></td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'></td>
</tr>
</table>
</td>
</tr>
</table>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p>
<p><span style='font-size:10.0pt'>Dear all,</span> <o:p></o:p></p>
<p><span style='font-size:10.0pt'>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'>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'>Thanks in advance for your help</span> <span
style='font-size:10.0pt'><br>
Michael </span> <o:p></o:p></p>
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