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<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.<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'>Luke<o:p></o:p></span></p>
<p class=MsoNormal><span style='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'> 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<o:p></o:p></span></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>
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border-color:-moz-use-text-color -moz-use-text-color'>
<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"'> Scott Parker [<a
href="mailto:sparker@aeieng.com">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>
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border-color:-moz-use-text-color -moz-use-text-color'>
<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
href="mailto:trace-users-bounces@lists.onebuilding.org">trace-users-bounces@lists.onebuilding.org</a>
[<a href="mailto:trace-users-bounces@lists.onebuilding.org">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">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>
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