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<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>Hi David,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>Charlie may have uncovered a problem with how SHGC is optimized
for developing the ASHRAE 90.1 prescriptive tables. I would
anticipate that the deeper the perimeter zones, the less valuable solar heating
is in Northern zones. As a thought experiment, consider a single zone per
floor versus a 5 zone model per floor with very narrow perimeter
zones.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>How deep are the perimeter zones in the ASHRAE prototypical
models?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>If the ASHRAE prescriptive requirements have not optimized energy
costs for representative building zoning, the problem statement that
results from this is not whether people can comply with the standard or
beat the standard as part of a LEED analysis, but whether the ASHRAE
standard is sufficiently stringent in northern
climates. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>If one can increase SHGC in a ECB analysis and show this decreases
energy costs relative to the prescriptive building, this allows one to decrease
efficiency in other building components and still comply with ASHRAE
90.1.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff>Thus whether the building complies prescriptively or via ECB, it
is desirable from an energy efficiency perspective that the prescriptive tables
are optimized for minimizing life cycle cost for the representative
prototypes.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=781364214-11042007><FONT face=Arial
color=#0000ff><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Garamond><FONT color=#800000><!-- Converted from text/rtf format --></P>
<P><SPAN lang=en-us><FONT face=Garamond color=#800000>Jon McHugh,
PE<BR></FONT></SPAN></FONT></FONT></SPAN></FONT></SPAN><BR></P></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>David S Eldridge<BR><B>Sent:</B>
Tuesday, April 10, 2007 12:15 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] ASHRAE 90.1 - window
SHGC<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007>Remember that those total annual energy quantities
include heating/cooling for the outside air which may be different than envelope
heating loads, and that the energy costs are not the same per BTU. (Not
sure where the EIA totals come from - DHW may also be
included?)</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=171074618-10042007>That
said, a typical "square" design would have perimeter zones that
would/wouldn't need heating even while the core of the building required
cooling. T</SPAN></FONT><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007>hat effect would be captured by an ECB analysis or
Appendix G analysis with the baseline building being "penalized' for using the
standard's glazing. </SPAN></FONT><FONT face=Arial color=#0000ff
size=2><SPAN class=171074618-10042007>The trade-offs between additional cooling
and beneficial solar heating could be quantified then, including the
costs.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007>Obviously, a building that might benefit from reduced
glazing requirements will now have to do a simulation to document that fact in
the code or LEED process. They could probably commission a much
simplified model to determine what level of glazing works best and then either
build a prescriptive building or pursue ECB as necessary.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=171074618-10042007>A LEED
building would normally have much of this modeling work included in their scope
anyway for EAC1, so an additional modeling exercise to determine the optimal
glazing wouldn't be a big deal.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=171074618-10042007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=171074618-10042007>I only
see this as a major problem for buildings in the northerly
climates that wanted to use 90.1 prescriptively, and that weren't going to
run an energy model already. I don't have a feel for how many buildings
would fall into that category.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><FONT face=Arial
size=2></FONT> </DIV>
<DIV>
<DIV align=left><FONT face=Arial
size=2>--------------------------------------------------------------</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>David S. Eldridge, Jr.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Project Engineer</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>LEED v2.0 Accredited
Professional</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Grumman/Butkus Associates</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>820 Davis St., Suite 300</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Evanston, IL 60201</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>847.328.3555 ext. 224</FONT></DIV>
<DIV align=left><FONT face=Arial size=2><A
href="mailto:dse@grummanbutkus.com">dse@grummanbutkus.com</A></FONT></DIV>
<DIV align=left><FONT face=Arial
size=2>-------------------------------------------------------------</FONT></DIV></FONT></DIV>
<DIV><BR></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; 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@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Leonard Sciarra<BR><B>Sent:</B>
Monday, April 09, 2007 1:43 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] ASHRAE 90.1 - window
SHGC<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2>Charlie,</FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2>(this maybe off topic) </FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff size=2>Good
point, however, you must remember, that the development of the prescriptive
tables in 90.1 is based on a generic office building with an floor plan aspect
ratio of 1:1. it is an internally load dominated building, so even up to
climate zone 7 (maybe not 8) in calculating ANNUAL energy
consumption, reducing solar heat gain (while allowing some light in for
assumed daylighting) was the key factor in the glazing selection that comes
out of the model. Again, it was annual energy consumption.
</FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2>Prescriptive codes are blunt instruments of change. I think
we all agree that if you change the building aspect ratio, choose good
glass/shading and install a daylight harvesting/dimming system,
design the interior to take advantage of all of this, you
are 70% of the way to a kick ass energy efficient design.</FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007>
<P style="MARGIN: 0in 0in 0pt" align=left><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Leonard Sciarra, AIA, LEED ap<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.577.6580 (Dir)</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>G E N S L E R | Architecture & Design Worldwide</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>30 West Monroe Street<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Chicago IL, 60603<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.456.0123<o:p></o:p></FONT></SPAN></P></SPAN></DIV>
<DIV><SPAN class=994253318-09042007></SPAN><BR> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>D. Charlie
Curcija<BR><B>Sent:</B> Monday, April 09, 2007 8:50 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] ASHRAE 90.1 - window
SHGC<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>International Glazing Database (IGDB), which is part of WINDOW
5.2 program (windows.lbl.gov) contains several hundred individual glass layers
whose solar transmittance is at or below 0.3, which, as a part of glazing
system and whole fenestration product, would produce SHGC of 0.25 or lower,
which meets ASHRAE 90.1 for all climate zones. The best choice for low
SHGC windows is so called spectrally selective low-e, and there are at
least 100 glass products with this type of low-e coating. The cost of
these products is only marginally higher than the cost of clear
glass.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>I think that you are definitely overlooking
something.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>Having said that, I do want to state that the use of low SHGC
products in heating dominated climates (anything at or above climate zone 5)
is wrong and is the major flaw of both ASHRAE 90.1 and IECC 2006, particularly
for orientations with potentially high solar gain in the winter, such as South
orientation.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><SPAN
class=453152915-31052005><FONT face=Arial>D. Charlie
Curcija</FONT></SPAN></DIV>
<DIV dir=ltr align=left>
<DIV align=left>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Carli,
Inc.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>18
Tanglewood Rd.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
face=Arial>Amherst, MA 01002</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Tel:
(413) 256-4647</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Fax:
(413) 256-4823</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>cell:
(413) 575-3487</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>email:
</FONT><A href="blocked::mailto:curcija@fenestration.com"><FONT
face=Arial>curcija@fenestration.com</FONT></A></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>web:
</FONT><A href="http://www.fenestration.com/"><FONT
face=Arial>http://www.fenestration.com</FONT></A></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><FONT face=Arial><FONT size=3><SPAN
class=453152915-31052005><FONT face="Times New Roman" size=3></FONT><FONT
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<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><STRONG><EM><FONT size=3><SPAN
class=453152915-31052005><SPAN class=453152915-31052005><FONT
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class=453152915-31052005><STRONG><EM><FONT face=Arial><FONT size=3><SPAN
class=640374411-20062006>S</SPAN>upport open document format as the <SPAN
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</EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG>
<DIV align=left>
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