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<DIV><SPAN class=859105214-10032009><FONT face=Arial color=#0000ff size=2>Here's
my take on it. The baseline building envelope on a renovation is supposed
to be modeled in the pre-renovated condition. This would include wall and window
thermal properties (U, SHGC, etc.) as well as infiltration estimates. The
proposed design would incorporate all changes and improvements to the envelope
and be modeled as such. It should be noted however that Section 5.4.3 of
90.1-2004 contains mandatory provisions for air leakage so the proposed design
must at least meet the mandatory requirements.</FONT></SPAN></DIV>
<DIV><SPAN class=859105214-10032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=859105214-10032009><FONT face=Arial color=#0000ff size=2>It is
unrealistic to assume a positive pressurization strategy eliminates
infiltration. Keep in mind infiltration occurs due to the vapor pressure and air
pressure differences across the envelope. During unoccupied periods fans usually
do not run so a positive pressurization strategy will not work if fans are off.
During the evenings and weekends the vapor pressure will equalize from
inside to outside bringing in any vapor in this air. Blower door tests are not
practical for most commercial buildings due to the large volume of air movement
required to create a pressure differential. Central AHU supply and exhaust fans
could be used with DDC controls to measure air leakage provided flow measuring
instrumentation was installed.</FONT></SPAN></DIV>
<DIV><SPAN class=859105214-10032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=859105214-10032009><FONT face=Arial color=#0000ff
size=2>Regards,</FONT></SPAN></DIV><SPAN class=859105214-10032009>
<DIV><BR><FONT face=Arial color=#0000ff size=2>Craig J. Gann, P.E.</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT></SPAN><SPAN
class=859105214-10032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Todd
Lagus<BR><B>Sent:</B> Tuesday, March 10, 2009 9:45 AM<BR><B>To:</B> Karen
Walkerman; Mark Prince<BR><B>Cc:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re: [Bldg-sim] Building
Infiltration<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">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>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; COLOR: #005480; FONT-FAMILY: 'Arial','sans-serif'">Todd
Lagus, EIT<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: 'Arial','sans-serif'">Mechanical
Engineer<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: 'Arial','sans-serif'">Sebesta
Blomberg <BR>sebesta.com</SPAN><SPAN
style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'">
</SPAN><SPAN
style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: 'Arial','sans-serif'">|
P 651.634.7236 | F 651.634.7400<o:p></o:p></SPAN></P>
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style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: 'Arial','sans-serif'"><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'">
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></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt">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>
<DIV>
<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>_______________________________________________<BR>Bldg-sim
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