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<font size="+1">For edge effect, the main variable is the spacer
type. That can be accessed from the window properties in the wall
components in the building shell tab. At the bottom of the Basic
Spec tab you will see the spacer type. It gives 5 choices. You
can also adjust 3 frame properties just above this tab.<br>
In the total heat loss from the exterior shell there will only be
a small difference between aluminum and insulated. Where this can
make a big difference is eliminating or reducing edge condensation
in cold climates in residential construction where you can have
wood window frames. In any construction though this condensation
can cause a mess if it runs onto materials which can be damaged by
water. Skylights specifically can generate a large amount of
condensation.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
</font><br>
On 05/01/2011 11:43 AM, Alex Krickx wrote:
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Thanks Bruce and Jeremy,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Well, you’ve answered my question but I still
have the same problem: how to account for edge-of-glass
effects in eQUEST (the edge of glass U-value will be between
the frame and COG values). Back to the drawing board I
guess. Thanks for the responses.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Alex Krickx<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<div>
<div style="border-right: medium none; border-width: 1pt
medium medium; border-style: solid none none; border-color:
rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;
padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"> Jeremy Goth
[<a class="moz-txt-link-freetext" href="mailto:jngoth@hotmail.com">mailto:jngoth@hotmail.com</a>] <br>
<b>Sent:</b> Wednesday, January 05, 2011 8:26 AM<br>
<b>To:</b> Alex Krickx<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] Window "Curb"<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">Go to your
building shell and navigate to the space/roof/skylight in
the component tree. Select the skylight then go to the
spreadsheet tab on the right and find 'Skylight Surface -
Curb - Performance'.<br>
<br>
Jeremy<br>
<o:p></o:p></span></p>
<div class="MsoNormal" style="text-align: center;"
align="center"><span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<hr id="stopSpelling" align="center" size="2" width="100%"></span></div>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">Date: Tue, 4 Jan
2011 20:00:19 -0500<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:bruce5@bellnet.ca">bruce5@bellnet.ca</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:akrickx@seriousmaterials.com">akrickx@seriousmaterials.com</a><br>
CC: <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
Subject: Re: [Equest-users] Window "Curb"<br>
<br>
</span><span style="font-size: 13.5pt; font-family:
"Tahoma","sans-serif";"> 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>
</span><span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><br>
On 04/01/2011 04:12 PM, Alex Krickx wrote: <o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">Hi
everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">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></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">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></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">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></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size: 10pt;">CURB
-CONDUCT</span></b><a moz-do-not-send="true"
name="_Toc140138080"></a><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal">Conductance of the skylight curb,
excluding the outside air film but including the inside air
film. <span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal">Notes:<span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">1. </span>You can
define curbs only for exterior windows and skylights, not
for interior windows.<span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">2. </span>If the
CURB-HEIGHT is zero no curb calculations will be performed.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">3. </span>The curb area
is <b>not</b> subtracted from the associated exterior wall
area.<span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">4. </span>Each hour,
the program adds the effect of a wind speed-dependent
outside air film to the user specified CURB-CONDUCT.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">5. </span>The various
elements of a curb (top, bottom, side, dividers, etc.) may
have different conductances. In this case, CURB-CONDUCT
should be an area-weighted average of the different
elements.<span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">6. </span>The program
finds the overall window conduction by adding curb, 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".<span style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">7. </span>A WINDOW
multiplier also multiplies the curb area.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">8. </span>Window fins
and overhangs shade the curb as well as the glazing.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">9. </span>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 curb.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><span
style="font-family: "Tms
Rmn","serif";">10. </span>If the window
has a setback, the curb is also set back by the same amount.<span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">Kind
regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">Alex
Krickx<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:
"Tahoma","sans-serif"; color: rgb(38,
47, 19);">Alex Krickx, LEED AP</span><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Tahoma","sans-serif"; color: gray;">Building
Energy Specialist</span><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 8pt; font-family:
"Tahoma","sans-serif"; color: rgb(31,
73, 125);"><b>Error! Filename not specified.</b></span><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Tahoma","sans-serif";">1250 Elko Dr,
Sunnyvale, CA 94089</span><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Tahoma","sans-serif";">(t)
408.541.8124</span><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family:
"Tahoma","sans-serif"; color: gray;"> </span><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"><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
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copying of this message is prohibited and you are to
notify us immediately by reply e-mail and delete the
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<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";"> <o:p></o:p></span></p>
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<pre><o:p> </o:p></pre>
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