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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In addition to what Craig says below the very
idea that it is okay to blow energy out of the building or suck in
unconditioned air at a high, variable, uncontrolled rates due to high leakage
through the envelope in both directions dependent upon pressure differentials is
certainly not very ‘green’ or energy saving at the least and we
feel contributes to much higher energy use than necessary and we know it
contributes to higher maintenance costs and lowered useful life of building
envelope components. Because it is not easy, is not something that HVAC manufacturers/companies/
ASHRAE can contend with, and requires knowledgeable on site inspection during
construction/remodel/repair it does not get the attention it deserves. My
belief is that it is a significant contributor to why modeling software does
not match up well with reality.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Furthermore, someone please take me to any
existing 10 (heck 5) story or taller building that does not desperately
try to suck in air low and spew it out high and any low rise with meaningfully
controlled building envelope conditioned air management. It is almost
impossible to find complete vapor barriers where they need to be at wall/roof
interfaces let alone the rest of it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We have seen these same issues in LEED
certified, yes certified, new buildings as the reward is low for actual
building envelope air and moisture penetration control (versus showing a design
and calculation that shows it is low) and no one is interested in inspecting
and making sure the work is done to meet LEED, heck even base code,
requirements because so far there is zero penalty (LEED, code, GBI, or anyone
else). The energy savings for existing buildings can be significant and
the lowered repair and maintenance costs for the building envelope are
significant if air and moisture penetration are controlled but the emphasis is
certainly not there most of the time. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>My feeling is that we absolutely should
reward with LEED points, attaboys, smiles, pats on the back, tax credits, and
everything else we can things done to existing buildings that increase the
useful life of components, lower environmental impact, lower maintenance
requirements and costs, and decrease energy usage. I thought that is what
the goals were, ACTUAL lowered environmental impact in all ways and lowered
costs. Building envelope infiltration gets only lip service and design
but there are no inspection standards and accountability to prove the work is
done appropriately.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The BEST Consultant, Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>C. J. Gann<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 10, 2009 2:01
PM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Todd Lagus'; 'Karen
Walkerman'; 'Mark Prince'<br>
<b><span style='font-weight:bold'>Cc:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Building
Infiltration</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>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.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>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. <st1:place w:st="on">Central AHU</st1:place> supply
and exhaust fans could be used with DDC controls to measure air leakage
provided flow measuring instrumentation was installed.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Regards,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
</span></font><font size=2 color=blue face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:blue'>Craig J. Gann, P.E.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Todd Lagus<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 10, 2009 9:45
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Karen Walkerman; Mark Prince<br>
<b><span style='font-weight:bold'>Cc:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Building
Infiltration</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#005480" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#005480;font-weight:bold'>Todd
Lagus, EIT<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 color="#807f83" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#807F83'>Mechanical Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color="#807f83" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#807F83'>Sebesta Blomberg <br>
sebesta.com</span></font><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'> </span></font><font
size=1 color="#807f83" face=Arial><span style='font-size:8.0pt;font-family:
Arial;color:#807F83'>| P 651.634.7236 | F 651.634.7400<o:p></o:p></span></font></p>
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style='font-size:8.0pt;font-family:Arial;color:#807F83'><o:p> </o:p></span></font></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Karen Walkerman<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 10, 2009 9:33
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Mark Prince<br>
<b><span style='font-weight:bold'>Cc:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Building
Infiltration<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size: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></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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>
<st1:Street w:st="on"><st1:address w:st="on">5802 Research Park Blvd.</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">Madison</st1:City>, <st1:State w:st="on">WI</st1:State>
<st1:PostalCode w:st="on">53719</st1:PostalCode></st1:place><br>
(608) 441-6668<br>
<a href="mailto:mprince@aeieng.com">mprince@aeieng.com</a><br>
<br>
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