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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As I understand it the issue is that the 90.1 Standard does not
establish a base line condition for air leakage so no savings can be claimed.
I certainly agree that the savings are real and should be counted. I know that
the Appendix G committee has this issue on their extensive “to do” list.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Marcus Sheffer, Chair – USGBC EA TAG<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>7group<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></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><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Paul
Grahovac<br>
<b>Sent:</b> Wednesday, August 19, 2009 7:00 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Air leakage, LEED, and Appendix G of ASHRAE 90.1<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>The National Institute of Standards and Technology (NIST) did an
extensive study documenting a greater than 40% natural gas savings and a
greater than 25% electricity savings across the nation for building energy
consumption if buildings were uniformly constructed with air barrier systems
installed. They evaluated 116 existing buildings and computer modeled
several different building types. The purpose of their study was to
provide information to ASHRAE concerning whether it would be desirable to add
an air barrier requirement to ASHRAE 90.1.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>As a result, I’ve always thought that Appendix G to ASHRAE 90.1
allows you to change the air leakage rate off the default and onto a rate
corresponding to an air barrier installation, so that you could claim LEED
points for the corresponding energy savings. However, an architect at a
presentation I did said you could not do that under the LEED and ASHRAE
requirements. (I know the models will do it, because I’ve done it on the
TRANE model and obtained results that support the NIST findings.)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>I see in Appendix G that: “G3.1.2.5. <b>Ventilation</b>.
Minimum <i>outdoor air</i> ventilation rates shall be the same for the <i>proposed</i>
and <i>baseline building designs</i>.” However, I searched the document
for “outdoor air ventilation” and the phrase occurs only in the context of
mechanical systems that are designed to intentionally bring air into the
building. If this section is the basis for concluding that air leakage
barriers should be left out of the modeling, then I have trouble understanding
why.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Appendix G says that all
components of the building are to be modeled as designed. That would
preclude modeling as if an air barrier system did not exist in the
design. It says the baseline building model is to have steel-framed
above-grade walls, and it is silent about the design building, but the User’s
Manual says that if the design building walls are block or cast concrete, then
“the mass is credited in the building performance rating method.”
Likewise, if the walls are wood stud instead of steel, then the Manual says
credit is given for the superior energy performance of wood frame versus steel
frame. The User’s Manual states that it: “</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Offers information on
the intent and application of Standard 90.1.”</span> <span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Given
these examples in the Manual based on existing thermal mass energy-saving data
and wood-versus-steel stud energy data, it is difficult to conclude that a wall
that is constructed with materials meeting the air leakage limits and
installation requirements of the Air Barrier Association of America and
determined to produce significant energy savings by the NIST study based on
those same limits and requirements should be modeled as if it leaked air like a
building without an air barrier. </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Please let me know what you think, and if you know of any reason
why it is not proper to change the air leakage rate through the building
envelope in the design model to show the benefit of air barriers.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Paul Grahovac, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>R-GUARD Air & Water-Resistive
Barrier Product Manager<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>PROSOCO, Inc.<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>3741 Greenway Circle<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Lawrence, Kansas 66046<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>(785) 830-7355<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>(888) 376-3417 fax<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'><a
href="mailto:pgrahovac@prosoco.com">pgrahovac@prosoco.com</a><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>web site <a
href="http://www.prosoco.com/">http://www.prosoco.com/</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
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