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it reads to me that your initial interpretation is what the reviewer is
asking for. on the other hand the question is what is constituting an
"independent" exhaust fan here. if the exhaust fan is part of the
balance of the supply/return/exhaust system it probably should be
modeled as such as it is not really different than having a return fan
installed in the ductwork somewhere and not in a unit itself. per hte
90.1 user's manual (page g-28 in 2004), "System fan electrical power
for supply, return, exhaust and relief fans is calculated based on the
following formula. The power from this formula includes supply,
return, relief, and exhaust fans ..." if the exhaust fan is not part
of the designed system supply/return/exhaust then i would think your
initial interpretation of what the reviewer is asking is correct.
whichever situation applies make sure the response documents the
purpose of the exhaust fans and how 90.1 applies (including
section/user manual references).<br>
<br>
On 5/20/11 6:15 AM, M. Shields wrote:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">The exact
comment is this:<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);">“The fan
power spreadsheet for the Baseline and Proposed models indicate that
the fan power of the exhaust fans have not been modeled identically in
each model. All independent fan systems of the HVAC systems in the
actual design must be modeled identically between the Proposed and
Baseline models at actual equipment capacities (fan volume and fan
power) as required by Table G3.1.10 in the Proposed building column,
since the fan design air flow rates and fan power per Sections G3.1.2.8
and G3.1.2.9, respectively, only applies to system types 1 through 8 in
Table G3.1.1A. If appealing this credit, revise the Proposed and
Baseline models so all independent fan systems of the HVAC systems are
modeled identically between the Proposed and Baseline models. In
addition, separate the energy consumption and peak demand energy for
independent fans in Table 1.8.1 and Table 1.8.2 of the template and
provide revised SV-A reports for each model reflecting the changes.”<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);">I
initially interpreted this to be that for exhaust systems the bhp/kw
needs to be identical in both buildings and based on the specified
equipment from the mechanical designer, however, my supply fan energy
was Ok. After reading the comment and Appendix G I am not unsure if I
also need to specify the fan power to be the same for both models, ie
use table G3.1.2.9 to calculate fan power for both instead of just the
baseline.<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"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Patrick
J. O'Leary, Jr.<br>
<b>Sent:</b> Friday, May 20, 2011 8:57 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Supply Fan Power<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">from your wording of "independent" it sounds
like you may have an application where you have a unit in the proposed
building that is required but not provided in the design? or something
similar. is this the case? if a unit is required in the proposed per
the requirement all spaces be heated/cooled (per the definitions) they
are required to be the same as the units in the baseline building. if
this is not the case if you post the exact comment it may shed some
light on the subject. otherwise i would argue the comment is in error
- if all of your zones are served by units in the proposed and you have
matching units in the baseline (regardless of system types) then your
approach would be correct. <br>
<br>
On 5/20/11 5:31 AM, M. Shields wrote: <o:p></o:p></p>
<p class="MsoNormal">Good Morning All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I recently received comments back from LEED and
one of them was about my fan power. In the submission I calculated all
of my fan power using G3.1.2.9 for the baseline building, and I used
the actual fan power in the proposed building. The reviewer has
commented that all independent fan systems have to be modeled
identically in both the baseline and the proposed building. The supply
fans use very high efficiency motors, and as such are substantially
more efficient than the calculation that G3.1.2.9 provides. Is there
no way to take credit for using high efficiency supply fans?<o:p></o:p></p>
<p class="MsoNormal"> <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"><span
style="font-size: 10pt; font-family: "Book Antiqua","serif";">____________________________<br>
Michael Shields</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Book Antiqua","serif";">Email: <a
moz-do-not-send="true" href="mailto:mshields@fstrategies.com">mshields@fstrategies.com</a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
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