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<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>If you
model energy savings for roofing products, be sure to account for smog.<span
style="mso-spacerun: yes"> </span>Yes I’m in Los Angeles.<span
style="mso-spacerun: yes"> </span>But ASHRAE does also note that energy
savings is negligible in industrial areas due to smoke and smog.<span
style="mso-spacerun: yes"> </span>I believe the real point here is that
unless the direct irradiation level is high then there isn’t much chance of savings.<span
style="mso-spacerun: yes"> </span>The diffuse irradiation will have the
same affect on a wall as it does a roof--White paint or rock anyone (as opposed
to snowcap type products)?<span style="mso-spacerun: yes"> </span>Your
point about New England’s latitude would fit in here about the diffuse radiation
part. <span style="mso-spacerun: yes"> </span>Additionally, I do recall that
there was a researcher at LBL who was educating people about albedo (smooth vs.
fluffy) as a surface property that needs to also be addressed; this is in
addition to abosorptance, reflectance, and emisstivity.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>I do not
believe very highly in the accuracy of the energy performance estimates for the
high performance roofing products.<span style="mso-spacerun: yes">
</span>All you need is a hazy month in June, and you’ve got more savings then
the prior year.<span style="mso-spacerun: yes"> </span>Wash the roof, for
that matter, and the results will change.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>My point
is, don’t expect much from your model, and expect less in real life.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle16><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoAutoSig><!--[if supportFields]><span class=EmailStyle16><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span style='mso-element:field-begin'></span><span
style="mso-spacerun: yes"> </span>AUTOTEXTLIST \s "E-mail
Signature" <span style='mso-element:field-separator'></span></span></font></span><![endif]--><font
color=navy><span style='color:navy'>Eric Kirchhoff, PE</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Project Engineer</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><![if !supportEmptyParas]> <![endif]></span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Sempra Energy Solutions</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Phone:<span style='mso-tab-count:1'> </span>(213)
244-4228</span></font><font color=navy><span style='color:navy;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Fax:<span style='mso-tab-count:1'> </span>(213)
244-4244</span></font><font color=navy><span style='color:navy;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>ekirchhoff@semprasolutions.com</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><![if !supportEmptyParas]> <![endif]></span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Sempra Energy Solutions is not the same
company as the utility SDG&E or SoCalGas, and Sempra Energy Solutions is
not regulated by the California Public Utilities Commission.</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><!--[if supportFields]><span class=EmailStyle16><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span style='mso-element:field-end'></span></span></font></span><![endif]--><span
class=EmailStyle16><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Wade McLaughlin
[mailto:wmclaughlin@dmiinc.com]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, October 07, 2002
10:55 AM<br>
<b><span style='font-weight:bold'>To:</span></b> BLDG-SIM@GARD.COM<br>
<b><span style='font-weight:bold'>Subject:</span></b> [BLDG-SIM] "Cool
Roofing"</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Has
anyone had any success modeling cool roofing options (i.e. reflective or light
colored surfaces) in PowerDOE? So far, I have seen negligible results
from the adjustment of roof construction absorptance values (emissivity is also
known to play a role, but there is no input for this in PowerDOE). I have
seen data showing cooling energy savings from 0.06 to 0.54 kWh/sqft/yr,
depending on building type. I am getting only a very small fraction
of this. Data collected in the study was from facilities in the
southern and western US, and I work primarily on buildings in the Northeast.</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>My
questions:</span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>How
well can I expect PowerDOE to simulate this? Is there a better
way to simulate cool roofing? Is the sun simply too low in the sky in New
England to yield substantial savings?</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Your
thoughts are appreciated.</span></font><font color=black><span
style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Wade
McLaughlin<br>
DMI<br>
450 Lexington St.<br>
Newton, MA 02466<br>
p 617-527-1525 x103<br>
f 617-527-6606</span></font><font color=black><span style='color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<pre style='margin-left:.5in'><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></pre><pre
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