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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>While I agree that there is oversight in not giving credit to reduce
infiltration, I do not feel like LEED credit should be given if there isn’t
an established baseline. Say, for example, the building infiltration was
exceptionally poor. Improving the building to even average infiltration
performance may have a large effect on the energy model, and LEED points would
be given for a building that may or may not deserve it. While improving
the infiltration issue saves energy for the owner, there is no guarantee that
the building does not perform poorly. Maybe there should be a LEED “most
improved” award which uses existing conditions as the baseline.<o:p></o:p></span></p>
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<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#005480'>Todd Lagus, EIT<o:p></o:p></span></b></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:#807F83'>Mechanical Engineer<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"'>From:</span></b><span
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bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Karen
Walkerman<br>
<b>Sent:</b> Tuesday, March 10, 2009 9:33 AM<br>
<b>To:</b> Mark Prince<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Building Infiltration<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>There aren't any. There
are a few standards that have infiltration baselines. I believe the HERS
(Home Energy Rating System) uses an infiltration baseline of about 0.35-0.4
ACH, and there are some other standards out there. Of course, some people
will argue that the building should be positively pressurized so that there
will be no infiltration. I don't know of anyone that has gotten credit
for LEED EA C1 for infiltration, but in my opinion, this is a huge Appendix G
oversight. My suggestion is to apply for a CIR and suggest an
infiltration baseline. If the building is 100% renovation, the baseline
could be established using a blower door test on the original building, or you
could come up with another reasonable, established baseline.<br>
<br>
--<br>
Karen<o:p></o:p></p>
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<p class=MsoNormal>On Tue, Mar 10, 2009 at 10:16 AM, Mark Prince <<a
href="mailto:mprince@aeieng.com">mprince@aeieng.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>Hello,<br>
<br>
I'm involved with a project that is considering pursuing LEED certification.
It is a remodel/renovation of an existing office building.<br>
<br>
The existing office building has quite a bit of infiltration. As part of
the renovation process, the exterior walls are being sprayed with a foam
insulation that will significantly reduce this infiltration. Someone has
asked the question, if we can take credit for this reduction in infiltration.
In other words, they want to model the Appendix G baseline building with
the old infiltration rate and model the proposed building with the new
infiltration rate. This will show a good amount of energy cost savings.<br>
<br>
Is this acceptable? I'm having a difficult time finding any reference to
infiltration rates within Appendix G.<br>
<br>
Thanks,<br>
<br>
Mark Prince<br>
Affiliated Engineers<br>
5802 Research Park Blvd.<br>
Madison, WI 53719<br>
(608) 441-6668<br>
<a href="mailto:mprince@aeieng.com">mprince@aeieng.com</a><br>
<br>
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