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Strictly speaking, every construction (window or wall) has a non-zero SHGC. A portion of absorbed solar radiation will ultimately end up inside a space (via conduction through the surface and later radiation/convection into the space). A highly insulated wall will transmit a negligible amount of energy. The ASHRAE Handbook of Fundamentals (Fenestration chapter) provides a method for calculating the SHGC of window frames. <div><br></div><div>For your opaque windows, the transmittance may be zero, but the SHGC > 0. The magnitude will depend on the construction of the "window"; with higher U-values leading to a higher SHGC. </div><div><br></div><div>Why not use LBNL Window software to calculate it? I ran the following tests with opaque glass and clear glass. Here are the results:</div><div>Plain opaque glass: SHGC = 0.31</div><div>Opaque outside, air, Clear inside: SHGC = 0.16</div><div>Clear outside, air, Opaque inside: SHGC = 0.5</div><div><br></div><div><br></div><div>Liam O'Brien</div><div>Assistant Professor</div><div>Carleton University<br><div><br></div><div><br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Wed, 29 Feb 2012 19:11:02 -0500<br>From: energy.wwind@cox.net<br>To: bldg-sim@lists.onebuilding.org<br>Subject: Re: [Bldg-sim] "Opaque" windows<br><br>
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It depends which surface is black........ S1 (outside) clear
>>> normal reflected / transmitted fractions....etc.<br>
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On 2/29/2012 7:00 PM, Alex Krickx wrote:
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<p class="ecxMsoPlainText">Hi Robert,</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">If it's an opaque window, can't it be
described as a construction/wall material? Why still define it
as a window? </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">Alex Krickx</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoNormal"><span style="font-size:12.0pt;color:#262F13">Alex Krickx, LEED AP</span></p>
<p class="ecxMsoNormal"><span style="color:gray">Building Energy
Specialist</span></p>
<p class="ecxMsoNormal"><span style="font-size:10.0pt;color:black">Serious
Energy, Inc.</span></p>
<p class="ecxMsoNormal"><span style="font-size:10.0pt;color:black">1250
Elko Dr, Sunnyvale, CA 94089</span></p>
<p class="ecxMsoNormal"><span style="font-size:10.0pt;color:black">(t)
408.541.8124</span></p>
<p class="ecxMsoNormal"><span style="font-size:10.0pt;color:black"><a class="ecxmoz-txt-link-abbreviated" href="mailto:akrickx@seriousenergy.com">akrickx@seriousenergy.com</a></span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;color:black"> </span></p>
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<p class="ecxMsoPlainText">-----Original Message-----<br>
From: <a class="ecxmoz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a class="ecxmoz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] On Behalf Of
RobertWichert<br>
Sent: Wednesday, February 29, 2012 3:59 PM<br>
To: <a class="ecxmoz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>; <a class="ecxmoz-txt-link-abbreviated" href="mailto:EnergyPro@yahoogroups.com">EnergyPro@yahoogroups.com</a>;
energysoftllc<br>
Subject: [Bldg-sim] "Opaque" windows</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">Does anybody know a SHGC for "Opaque"
windows? I think they painted </p>
<p class="ecxMsoPlainText">them black.</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">I don't think "0.00" is appropriate, but
I'm willing to listen to reason...</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">-- </p>
<p class="ecxMsoPlainText">Robert Wichert P.Eng. LEED AP</p>
<p class="ecxMsoPlainText">+1 916 966 9060</p>
<p class="ecxMsoPlainText">FAX +1 916 966 9068</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">===============================================</p>
<p class="ecxMsoPlainText"> </p>
<p class="ecxMsoPlainText">_______________________________________________</p>
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