Hi Catalina-<div><br></div><div>I think that Duncan's proposal is good.</div><div><br></div><div>If it is more advanced than that, say if you have some sort of trellis, or advanced shading mechanism, it can be simplified through good old geometry. I wrote something on this about two years ago: <a href="http://energy-models.com/blog/11-11-10/simplifying-shading-equest-and-trace-700">http://energy-models.com/blog/11-11-10/simplifying-shading-equest-and-trace-700</a></div>
<div><br></div><div>Basically, it comes down to simplifying virtually any shading device into 1 overhang (or fin)</div><div><br></div><div>However, Duncan's approach will probably work. (The main downside to the weighted average approach is that you don't necessarily get the full shading value at peak loads or in the summer months)</div>
<div><br></div><div>Best Regards,</div><div><br></div><div>Bob</div><div><br><div class="gmail_quote">On Tue, Dec 18, 2012 at 3:07 PM, <span dir="ltr"><<a href="mailto:trace-users-request@lists.onebuilding.org" target="_blank">trace-users-request@lists.onebuilding.org</a>></span> wrote:<br>
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Today's Topics:<br>
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1. Intricate shading devices. (Caballero, Catalina)<br>
2. Re: Intricate shading devices. (Duncan S. McClellan)<br>
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Message: 1<br>
Date: Tue, 18 Dec 2012 11:25:03 -0500<br>
From: "Caballero, Catalina" <<a href="mailto:ccaballero@jalrw.com">ccaballero@jalrw.com</a>><br>
To: "<a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a>"<br>
<<a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a>><br>
Subject: [Trace-users] Intricate shading devices.<br>
Message-ID:<br>
<<a href="mailto:0B754EE940ECB849A0162ADAC4A7139101C16F265827@mail-svr.jalrw.com">0B754EE940ECB849A0162ADAC4A7139101C16F265827@mail-svr.jalrw.com</a>><br>
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<br>
Good morning,<br>
<br>
I'm trying to model aluminum shading devices that are not fins, nor overhangs. These are thin shading panels that vary in size and location due to architectural aesthetics on the facade. Does anybody know how to model something like this or represent it effectively in the model?<br>
<br>
<br>
<br>
[cid:image004.jpg@01CDDD12.530EA170]<br>
<br>
Regards,<br>
Catalina Caballero, AIA. Assoc., LEED GA.<br>
Johnson, Avedano, Lopez, Rodriguez & Walewski<br>
Engineering Group, Inc.<br>
<br>
2510 NW 97th Avenue, Suite 220, Miami, Florida 33172<br>
Tel. <a href="tel:%28305%29%20594-0660%20Ext.%20217" value="+13055940660">(305) 594-0660 Ext. 217</a> Fax <a href="tel:%28305%29%20594-0907" value="+13055940907">(305) 594-0907</a><br>
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[cid:image001.jpg@01CDDD11.CA21AEC0]<br>
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Message: 2<br>
Date: Tue, 18 Dec 2012 14:49:59 -0500<br>
From: "Duncan S. McClellan" <dmcclellan@ClarkNexsen.com><br>
To: "Caballero, Catalina" <<a href="mailto:ccaballero@jalrw.com">ccaballero@jalrw.com</a>>,<br>
"<a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a>"<br>
<<a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a>><br>
Subject: Re: [Trace-users] Intricate shading devices.<br>
Message-ID:<br>
<<a href="mailto:202912C8EDB23349AE5037B8C2D2301207F9E0C30A@cn-exmbs-1.Corp.ClarkNexsen.com">202912C8EDB23349AE5037B8C2D2301207F9E0C30A@cn-exmbs-1.Corp.ClarkNexsen.com</a>><br>
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<br>
You may have to do a separate hand calculation to determine an adjusted SHGC value. ASHRAE Fundamentals 2009 chapter15 has some information regarding IAC correction values, etc. but I don't they cover what I see indicated below.<br>
<br>
A rough estimate could be made as follows;<br>
<br>
<br>
1) Estimate the average % of glass shaded during the year. This may require some geometry work regarding azimuths, solstices, etc.<br>
<br>
2) Assign the shaded percentage of glass SHGC=0<br>
<br>
3) Calculate a weighted average SHGC:<br>
<br>
[(Area Glass Shaded * 0) + (Area Glass Unshaded * SHGC)] / Total Glass Area<br>
<br>
<br>
Somebody please let me know if I am mistaken. Thanks.<br>
<br>
<br>
Duncan McClellan PE, BEMP, LEED AP<br>
Mechanical Engineer<br>
<br>
CLARK NEXSEN<br>
Architecture & Engineering<br>
6160 Kempsville Circle Suite 200A<br>
Norfolk, VA 23502<br>
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From: <a href="mailto:trace-users-bounces@lists.onebuilding.org">trace-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:trace-users-bounces@lists.onebuilding.org">trace-users-bounces@lists.onebuilding.org</a>] On Behalf Of Caballero, Catalina<br>
Sent: Tuesday, December 18, 2012 11:25 AM<br>
To: <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br>
Subject: [Trace-users] Intricate shading devices.<br>
Importance: High<br>
<br>
<br>
Good morning,<br>
<br>
I'm trying to model aluminum shading devices that are not fins, nor overhangs. These are thin shading panels that vary in size and location due to architectural aesthetics on the facade. Does anybody know how to model something like this or represent it effectively in the model?<br>
<br>
<br>
<br>
[cid:image002.jpg@01CDDD2C.F265A6A0]<br>
<br>
Regards,<br>
Catalina Caballero, AIA. Assoc., LEED GA.<br>
Johnson, Avedano, Lopez, Rodriguez & Walewski<br>
Engineering Group, Inc.<br>
<br>
2510 NW 97th Avenue, Suite 220, Miami, Florida 33172<br>
Tel. <a href="tel:%28305%29%20594-0660%20Ext.%20217" value="+13055940660">(305) 594-0660 Ext. 217</a> Fax <a href="tel:%28305%29%20594-0907" value="+13055940907">(305) 594-0907</a><br>
<br>
Visit us online: <a href="http://www.jalrw.com" target="_blank">www.jalrw.com</a><<a href="http://www.jalrw.com/" target="_blank">http://www.jalrw.com/</a>><br>
<br>
[cid:image003.jpg@01CDDD2C.F265A6A0]<br>
<br>
HVAC - Electrical - Plumbing - Fire Protection<br>
Sustainable Development - Commissioning<br>
<br>
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