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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Julia,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Thank
you for your detailed response. This is exactly what I need.<br>
Luke<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Julia Beabout
[mailto:juliabeabout@yahoo.com] <br>
<b>Sent:</b> Tuesday, April 06, 2010 11:06 AM<br>
<b>To:</b> Wilson, Luke; Craig Gann<br>
<b>Cc:</b> trace-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Trace-users] Ventilation Rate<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt'>Hi Luke,<br>
<br>
Trace does have a way of specifying (forcing) the ventilation rate at the
system level. I actually use this a lot since I find that using Trace to
calc the ASHRAE 62 total OA quantity can sometimes get cumbersome when you have
a few rooms that need a relatively high amount of outdoor air. It's
sometimes faster to manipulate things at the system level than at the room or
template level.<br>
<br>
To simulate OA at the system level: go to Create Systems....Options
Tab....click on the Advanced button.....in the bottom right of that screen is
where you can specify the ventilation rate at the system level where it says
"System Level Ventilation Overrides". This will override any OA
inputs you've put in elsewhere. You can put the OA in as a % of the total
SA. That may not fit your situation exactly, but, I find that I can
usually create and assign a schedule/profile to that % value that will simulate
the situation I'm looking for (for example if my OA constant and doesn't
actually vary with my SA etc). <br>
<br>
I recommend checking the calculation results to make sure Trace is simulating
the amount of OA you actually want at the full and part load hours. I
usually find this to be an iterative process: input, calc, review results,
rinse and repeat. To check the OA results, use the hourly reports:
go to Calc and Review...View results button....Analysis Reports tab....Graph
Profiles and Energy Button. If you are not familiar with this page it can
be a little tricky to get used to but its EXTREMELY useful. To view you
the calc'd OA on an hourly basis: go to the View pull down menu at the top and
check "Table, Settings, and Advanced". I recommend unchecking
"chart" so you can get a bigger view of the table. Via the boxes
and buttons on the left side of the screen, pick the system you want to view
(via the Time/Selection Section at the top...not via the more intuitive list of
systems at the bottom). To see the OA cfms on an hourly basis: check
Table and Demand (uncheck consumption), select HVAC Equip in the pull down menu
next to "Comps", select the Airside tab just below that, scroll down
and check Vent Airflow within that tab. And,voila!....you can see the OA
cfm for any given system on an hourly basis among many other things if you
select them. <br>
<br>
Good luck.<br>
Julia<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
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<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"'> "Wilson, Luke"
<LWilson@integral-group.net><br>
<b>To:</b> Craig Gann <cjg04austin@swbell.net><br>
<b>Cc:</b> "trace-users@lists.onebuilding.org"
<trace-users@lists.onebuilding.org><br>
<b>Sent:</b> Tue, April 6, 2010 7:45:47 AM<br>
<b>Subject:</b> Re: [Trace-users] Ventilation Rate</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:windowtext'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'>Thanks to all for the replies.
So to summarize: the system level ventilation rate should be the same in both
cases, but Trace doesn't have a way to specify system level ventilation.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Luke</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
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<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;color:windowtext'>From:</span></b><span
style='font-size:10.0pt;color:windowtext'> Craig Gann
[mailto:cjg04austin@swbell.net] <br>
<b>Sent:</b> Monday, April 05, 2010 4:48 PM<br>
<b>To:</b> Wilson, Luke<br>
<b>Cc:</b> Scott Parker; trace-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Trace-users] Ventilation Rate</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>To expand on the discussion..... minimum ventilation rates
at the space (room) level are defined by ASHRAE 62, however the design quantity
of ventilation air (cfm) introduced into the system must be the same for both
proposed and baseline designs. How that ventilation air is controlled at
off-peak conditions (such as with DCV, etc) is where the potential energy
savings are for the proposed design. In other words both designs must introduce
the same ventilation cfm at the design condition. The design ventilation
quantity is to be calculated per the ASHRAE 62.1 version applicable to the
particular LEED version you are using.<br>
<br>
Regards,<br>
<br>
Craig J. Gann, P.E.; LEED AP<br>
<br>
On 4/5/2010 3:27 PM, Wilson, Luke wrote: <o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks for the reply.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>So the minimum ventilation rates
that Appendix G is referencing is on the space level and not on the system
level?</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Luke</span><o:p></o:p></p>
<p class=MsoNormal><span style='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'>
<p class=MsoNormal><b><span style='font-size:10.0pt'>From:</span></b><span
style='font-size:10.0pt'> Scott Parker [<a href="mailto:sparker@aeieng.com"
target="_blank">mailto:sparker@aeieng.com</a>] <br>
<b>Sent:</b> Monday, April 05, 2010 4:25 PM<br>
<b>To:</b> Wilson, Luke<br>
<b>Subject:</b> RE: Ventilation Rate</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>You will have the same outside
air per person or per area rate in the templates when you create a new
alternate based on the Alternative 1. If your system type changes so that
you have a more efficient introduction of outside air, and thereby reduce the
total outside air required, then this is a legitimate savings. However,
you must have the same outside air rates per person or per area (e.g. in a lab
if you have a minimum of 6 ACH, once-thru, then you cannot show savings for
going down to 4 ACH in the proposed design – I think this is what 90.1 wants to
avoid). </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Scott</span><o:p></o:p></p>
<p class=MsoNormal><span style='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'>
<p class=MsoNormal><b><span style='font-size:10.0pt'>From:</span></b><span
style='font-size:10.0pt'> <a
href="mailto:trace-users-bounces@lists.onebuilding.org" target="_blank">trace-users-bounces@lists.onebuilding.org</a>
[<a href="mailto:trace-users-bounces@lists.onebuilding.org" target="_blank">mailto:trace-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Wilson, Luke<br>
<b>Sent:</b> Monday, April 05, 2010 4:03 PM<br>
<b>To:</b> <a href="mailto:trace-users@lists.onebuilding.org" target="_blank">trace-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Trace-users] Ventilation Rate</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Hello,<o:p></o:p></p>
<p class=MsoNormal>For ASHRAE 90.1 Appendix G, it requires that the proposed
and baseline ventilation rates be the same. I have my proposed ventilation
rate. Is there a way to input a system level Ventilation rate in Trace?<o:p></o:p></p>
<p class=MsoNormal>Any help would be appreciated.<o:p></o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#7F7F7F'>* Please
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<p class=MsoNormal><b><span style='font-size:9.0pt;color:#7F7F7F'>Luke Wilson</span></b><span
style='font-size:9.0pt;color:#7F7F7F'>, EIT, LEED AP BD+C</span><o:p></o:p></p>
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