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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Since several buildings have been designed
(and are still being designed) with glass percentages greater than 50% and up
to 80%, I am sending this message again.</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'>What is the basis for envelope properties
for vertical glass in different climate zones? </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Ex: climate zone tables B-11, B-12, B-13,
B-16, B-17 & B-19 for 50% glass in STD-90-2001.</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'>B-10
HDD65=2701-3600 CDD50=5401
+
U-fixed=0.46 SHGC-all=0.19</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-11
HDD65=2701-3600 CDD50=3601-5400
U-fixed=0.46 SHGC-all=0.27 </span></font><font
color=navy><span style='color:navy'>Atlanta</span></font><font color=navy><span
style='color:navy'>, GA</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-12
HDD65=2701-3600
CDD50=0-3600
U-fixed=0.73 SHGC-all=0.39</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-13
HDD65=3601-5400 CDD50=3601
+
U-fixed=0.46 SHGC-all=0.25</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-16
HDD65=5401-7200 CDD50=3601
+
U-fixed=0.46 SHGC-all=0.23</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-17
HDD65=5401-7200 CDD50=1801-3600
U-fixed=0.46 SHGC-all=0.26 Chicago, IL</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>B-19
HDD65=7201-9000 CDD50=1801
+
U-fixed=0.46 SHGC-all=0.26</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'>SC = SHGC / 0.85 approx. </span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>U-Operable = U-fixed + 0.01 approx.
Ex: U-fixed = 0.46, U-operable = 0.47 for zone B-17.</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'>Should there be an infiltration rate based
on varying annual outdoor air temperatures and building types associated with
fixed (pressurized buildings) windows and operable windows?</span></font><font
color="#333399"><span style='color:#333399'> AAMA (American Architectural
Manufacturers Association) 101-85 for Heavy Commercial grade fixed window
specifies air infiltration of 0.06 cfm per ft2 area of outside frame dimension
at 6.24 psf pressure. 10CFR435 indicates 0.15 cfm/ft2 for fixed
windows. Neither document shows the outside-inside temperature and height
of building basis for the infiltration.</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=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>ASHRAE Standard 90 shows a different glass
SHGC for the North exposure. Example SHGC-north = 0.36 and SHGC-all =
0.26 for climatic zone B-17 (</span></font><font color=navy><span
style='color:navy'>Chicago</span></font><font color=navy><span
style='color:navy'>). For buildings that have the same glass on all sides
can we use the weighted average SHGC? Example: Weighted average
SHGC = (0.26*3 + 0.36)/4 = 0.285. Is the north orientation limited to 0
degrees (DOE2 program or180 degrees ASHRAE) or can it be a range from 316
degrees clockwise through 0 degrees to 44 degrees.</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'>I have not looked at the new STD90-2004
climate zone envelope properties yet, but the map shows locations on the sea
coast and locations inside the continent belonging to the same climate zone. </span></font><font
color=navy><span style='color:navy'>Glasgow</span></font><font color=navy><span
style='color:navy'>, </span></font><font color=navy><span style='color:navy'>U.K.</span></font><font
color=navy><span style='color:navy'> is 56 degrees latitude and the annual
temperature range is +25 F to +75 F, and </span></font><font color=navy><span
style='color:navy'>Minneapolis</span></font><font color=navy><span
style='color:navy'>, </span></font><font color=navy><span style='color:navy'>USA</span></font><font
color=navy><span style='color:navy'> is 45 degrees latitude and the annual
temperature range is -16 F to +91 F.</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'>Since energy analysis for Std90 and code
compliance requires 8760-hour weather data, the climatic zones could be based
on the actual HDD65 and CDD50. The weather data accounts for altitude.
Example, </span></font><font color=navy><span style='color:navy'>La Paz</span></font><font
color=navy><span style='color:navy'>, </span></font><font color=navy><span
style='color:navy'>Bolivia</span></font><font color=navy><span
style='color:navy'> is 16 degrees latitude, 13,169 feet elevation and the
annual temperature range is +25 F to +63 F, and </span></font><font color=navy><span
style='color:navy'>Acapulco</span></font><font color=navy><span
style='color:navy'>, </span></font><font color=navy><span style='color:navy'>Mexico</span></font><font
color=navy><span style='color:navy'> is 16 degrees latitude, 16 feet elevation and
the annual temperature range is +68 F to +92 F.</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'>During preliminary design we assume that
energy efficient Low-E double glass has properties of U = 0.30, SC = 0.35 and
VLT = 0.34. The cost of glass increases significantly with more efficient
glass. What sort of glass (manufacturer name and model) would ASHRAE
Standard 90 recommend for buildings that have more than 50% glass in climate
zones B-10 and B-16? Example: 60% to 75% glass (13.5’ floor-floor
building with 8’ to 10’ glass height).</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'>Varkie Thomas</span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>SOM</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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