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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Can infiltration be considered in comparing
standard versus proposed design models using the ECB method and for LEED
credits under “Optimize Energy Performance”? Typically we use
the same criteria in both models, but this is a particular case of a proposed
double-wall building. “10CFR435 Table 402.2.1. – Air Leakage
for Fenestration & Doors Maximum Allowable Infiltration Rate”
provides standard model information for federal buildings. For example,
the infiltration rate is 0.15 cfm/ft2 for fixed aluminum windows. Can
this be used for LEED standard design and can a lower rate be used for double
wall buildings?</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>The CFR table does not account for Heating
& Cooling Degree Days as with Table-B Building Envelope Requirements of
STD90. In my opinion, the peak design infiltration rate should be varied
from maximum in winter to minimum in summer (typically zero for pressurized
buildings) using a schedule. The maximum, of say 0.15 cfm/ft2, would
apply to a cold climate such as </span></font><font color=navy><span
style='color:navy'>Chicago</span></font><font color=navy><span
style='color:navy'> and it should be scaled down for warmer climates. </span></font><font
color="#333399"><span style='color:#333399'>Since DOE2 does not allow
infiltration rates on the basis of cfm/ft2 of wall or window area or cfm per
lineal foot of window perimeter, we create a typical perimeter space and
convert the window based infiltration rate to cfm/ft2 of space area or space
air changes. </span></font><font color=navy><span style='color:navy'>We then
look at the results in </span></font><font color="#333399"><span
style='color:#333399'>“REPORT- LS-C BUILDING PEAK LOAD COMPONENTS”
of the DOE2 output to see if the infiltration load looks reasonable (relative
to the other loads) for the location and type of building and make adjustments
by trial and error. Judgment and experience is considered more reliable
than theoretical mathematical models. The BEPS and BEPU reports in DOE2
should separate out the infiltration loads from the heating & cooling
loads. Any comments?</span></font></p>
<p class=MsoNormal><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399'> </span></font></p>
<p class=MsoNormal><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399'>Thanks for the comments and suggestions to
using different utilities in standard versus proposed design. They were
very helpful in making some decisions here. Most of the responses seem to
go directly to the person asking the question.</span></font></p>
<p class=MsoNormal><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399'> </span></font></p>
<p class=MsoNormal><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399'>Varkie Thomas</span></font></p>
<p class=MsoNormal><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399'>Skidmore, Owings & Merrill LLP</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
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