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<font size="+1"> A curb is used to lift the window up off the
roof and allow the window to be flashed and made water tight. It
can be as simple as a 2x6 or 2x8 wood box. A complicated one
would be a fully insulated wall tunnel through a roof truss
system. It should be modelled as an exterior wall. There should
be no edge of glass effect as all the glass should be inside the
opening. There will be an edge/corner effect where the window
frame sits on the curb.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
</font><br>
On 04/01/2011 04:12 PM, Alex Krickx wrote:
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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Happy New Year! Well, to start off the new
year, I have a question on what the “curb” is in the LV-H
report. The placement of the information, and the fact that it
has an area and U-value (much the way the window frame does)
leads me to believe it may be to account for Edge-of-Glass
effects (if you look at Window5 outputs it has COG U-values,
frame U-values and edge-of-glass U-values).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I can’t see anywhere in the detailed edit
mode to input curb information - I looked in both the “Glass
Type Properties” and “Window Properties” Screens.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I found the following info in the DOE2 help
file, but it looks like it only applies to skylights? It also
wasn’t clear if it was in fact for edge of glass, and how to
add this information (I’m guessing in the INP file?). Thanks
for any help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style=""><b><span style="font-size: 10pt;
font-family: "Times New
Roman","serif"; background: none repeat
scroll 0% 0% rgb(178, 180, 191);">CURB</span></b><b><span
style="font-size: 10pt; font-family: "Times New
Roman","serif";"> -CONDUCT<a
moz-do-not-send="true" name="_Toc140138080"><o:p></o:p></a></span></b></p>
<p class="MsoNormal" style=""><span style="font-size: 12pt;
font-family: "Times New Roman","serif";">Conductance
of the skylight <span style="background: none repeat scroll
0% 0% rgb(178, 180, 191);">curb</span>, excluding the
outside air film but including the inside air film. <o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 12pt;
font-family: "Times New Roman","serif";">Notes:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">1. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">You can define <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">curbs</span> only for exterior windows and
skylights, not for interior windows.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">2. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">If the <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">CURB</span>-HEIGHT is zero no <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">curb</span> calculations will be performed.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">3. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">The <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">curb</span> area is <b>not</b> subtracted from the
associated exterior wall area.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">4. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">Each hour, the program adds
the effect of a wind speed-dependent outside air film to the
user specified <span style="background: none repeat scroll
0% 0% rgb(178, 180, 191);">CURB</span>-CONDUCT.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">5. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">The various elements of a <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">curb</span> (top, bottom, side, dividers, etc.) may
have different conductances. In this case, <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">CURB</span>-CONDUCT should be an area-weighted
average of the different elements.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">6. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">The program finds the
overall window conduction by adding <span
style="background: none repeat scroll 0% 0% rgb(178, 180,
191);">curb</span>, frame, edge-of-glass, and
center-of-glass contributions. Thus, all three of these
contributions are included in each of the following report
quantities:<br>
"Window Conduction" in summary reports LS-B, LS-C,
LS-E, and LS-F;<br>
"Window U-Value" and "Window Area" in verification
report LV-D and LV-H;<br>
WINDOW hourly report variable #1, "Window
U-Value".<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">7. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">A WINDOW multiplier also
multiplies the <span style="background: none repeat scroll
0% 0% rgb(178, 180, 191);">curb</span> area.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">8. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">Window fins and overhangs
shade the <span style="background: none repeat scroll 0% 0%
rgb(178, 180, 191);">curb</span> as well as the glazing.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">9. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">Shading devices, like blinds
and drapes, that you specify using the WINDOW keywords
SHADING-SCHEDULE and CONDUCT-SCHEDULE, affect only the
glazed part of the window. They do not affect the heat
conduction through the <span style="background: none repeat
scroll 0% 0% rgb(178, 180, 191);">curb</span>.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-size: 12pt; font-family: "Tms
Rmn","serif";">10. </span><span
style="font-size: 12pt; font-family: "Times New
Roman","serif";">If the window has a setback,
the <span style="background: none repeat scroll 0% 0%
rgb(178, 180, 191);">curb</span> is also set back by the
same amount.</span><span style="font-size: 12pt;
font-family: "Times New Roman","serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal">Alex Krickx<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size: 12pt; color:
rgb(38, 47, 19);">Alex Krickx, LEED AP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: gray;">Building
Energy Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 8pt; color: rgb(31,
73, 125);"><img id="Picture_x0020_1"
src="cid:part1.09000608.00070209@bellnet.ca"
alt="email_sig" height="42" width="121"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 9pt;">1250 Elko Dr,
Sunnyvale, CA 94089<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt;">(t)
408.541.8124<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: gray;"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size: 7.5pt;
font-family: "Arial","sans-serif";">Warning:</span></i></b><i><span
style="font-size: 7.5pt; font-family:
"Arial","sans-serif";"> The
information contained in this e-mail may be privileged
attorney-client communications or attorney work product
and/or proprietary and confidential. If the reader of
this message is not the intended recipient then you have
received it in error and any review, distribution or
copying of this message is prohibited and you are to
notify us immediately by reply e-mail and delete the
original message immediately.</span></i><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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