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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:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thanks
for the reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">So the
minimum ventilation rates
that Appendix G is referencing is on the space level and not on the
system
level?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Luke<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";"> Scott
Parker
[<a class="moz-txt-link-freetext" 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<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Scott<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:trace-users-bounces@lists.onebuilding.org">trace-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" 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 class="moz-txt-link-abbreviated" href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Trace-users] Ventilation Rate<o:p></o:p></span></p>
</div>
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<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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<p class="MsoNormal" style=""><b><span
style="font-size: 9pt; font-family: "Arial","sans-serif"; color: rgb(127, 127, 127);">Luke
Wilson</span></b><span
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EIT,
LEED AP BD+C<o:p></o:p></span></p>
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