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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>All,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>The NRC document Performance Compliance for Buildings,
states that if the fenestration to wall ratio is greater than 0.4 to use the
following formula:</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Ar = Ap + (1-(0.4/FWR))*Awind</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Ar = Reference opaque area</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Ap = Proposed opaque area</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>FWR = Fenestration to wall ratio</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Awind = Area of windows in proposed
design</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>I assumed that the intent was to increase the reference
case wall area so that the FWR equals 0.4. But this calculation does not
do that. I calculated for a proposed design with a FWR of 0.46 and
the resulting reference FWR is 0.43???</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT><FONT face=Arial color=#0000ff
size=2><SPAN class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>The EE4-CBIP modeling documentation states that the
window to wall ratio shall be for the reference case 0.4 and if the proposed
case is greater than 0.4 than you must increase the wall area so that the wwr
does equal 0.4</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Any suggestions on what to do? Does anyone have
any experience with the NRC document and why there is a disconnect between the
intent of the calc and the results?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Thanks.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=820081322-07022008>Tim.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff
size=2></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff
size=2></FONT> </DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 9pt; FONT-FAMILY: Arial" align=left><B>Timothy
Howe</B><BR>Mechanical Engineer<BR>Stantec<BR></DIV>
<DIV style="FONT-SIZE: 9pt; FONT-FAMILY: Arial" align=left> </DIV>
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