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<DIV dir=ltr align=left><SPAN class=296342911-11032009><FONT face=Arial
color=#0000ff size=2>Andy, you're right on! Doug is also spot on re: LEED
EBOM. EBOM actually measures results, something LEED-NC cannot do because
it's models aren't built yet.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=296342911-11032009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=296342911-11032009><FONT face=Arial
color=#0000ff size=2>Infiltration calcs have always been a thorn in the side of
anyone calculating heating / cooling loads since they're so dependent on actual
construction practice (not to mention the effects of aging, settling,
etc.) In theory, a savvy building owner will continue to pay
attention to energy use over the life of the building and observe rising energy
use that's well-correlated to infiltration -- then fix it.
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=296342911-11032009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=296342911-11032009><FONT face=Arial
color=#0000ff size=2>That's a rare owner, I know!</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><B
style="mso-bidi-font-weight: normal"><FONT size=4>The Building Performance
Team<BR></FONT></B><B style="mso-bidi-font-weight: normal">James V. Dirkes II,
P.E., LEED AP<BR></B>1631 Acacia Drive NW<BR>Grand Rapids, MI 49504<BR>616
450 8653<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV> </DIV><BR>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Andy
hoover<BR><B>Sent:</B> Tuesday, March 10, 2009 8:13 PM<BR><B>To:</B> 'C. J.
Gann'; 'Todd Lagus'; 'Karen Walkerman'; 'Mark Prince'<BR><B>Cc:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re: [Bldg-sim] Building
Infiltration<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Andy
Hoover</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Principal<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The BEST Consultant,
Inc.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Office:
678-200-7648<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Fax:678-827-0574<o:p></o:p></SPAN></FONT></P>
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style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Cell:
678-793-1159<o:p></o:p></SPAN></FONT></P>
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style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"><A
href="http://www.thebestconsultant.com">www.thebestconsultant.com</A><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"><o:p> </o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Regards,</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><BR></SPAN></FONT><FONT face=Arial color=blue
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Craig J.
Gann, P.E.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE style="MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; MARGIN-RIGHT: 0in">
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Tahoma
size=2><SPAN style="FONT-SIZE: 10pt; 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 face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">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 face=Calibri color=#1f497d size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Arial color=#005480 size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: #005480; FONT-FAMILY: Arial">Todd
Lagus, EIT<o:p></o:p></SPAN></FONT></B></P>
<P class=MsoNormal><FONT face=Arial color=#807f83 size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: Arial">Mechanical
Engineer<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=#807f83 size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: Arial">Sebesta Blomberg
<BR>sebesta.com</SPAN></FONT><FONT face=Arial color=#1f497d size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: Arial">
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style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: Arial">| P
651.634.7236 | F 651.634.7400<o:p></o:p></SPAN></FONT></P>
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style="FONT-SIZE: 8pt; COLOR: #807f83; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 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></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">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 face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">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>_______________________________________________<BR>Bldg-sim
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