[Trace-users] Intricate shading devices.

Duncan S. McClellan dmcclellan at ClarkNexsen.com
Tue Dec 18 11:49:59 PST 2012

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.

A rough estimate could be made as follows;

1)    Estimate the average % of glass shaded during the year.  This may require some geometry work regarding azimuths, solstices, etc.

2)    Assign the shaded percentage of glass SHGC=0

3)    Calculate a weighted average SHGC:

[(Area Glass Shaded * 0) + (Area Glass Unshaded * SHGC)] / Total Glass Area

Somebody please let me know if I am mistaken.  Thanks.

Duncan McClellan PE, BEMP, LEED AP
Mechanical Engineer

Architecture & Engineering
6160 Kempsville Circle Suite 200A
Norfolk, VA 23502
757.455.5800 Office
757.455.5638 Fax
dmcclellan at clarknexsen.com<mailto:dmcclellan at clarknexsen.com>

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Caballero, Catalina
Sent: Tuesday, December 18, 2012 11:25 AM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Intricate shading devices.
Importance: High

Good morning,

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?

[cid:image002.jpg at 01CDDD2C.F265A6A0]

Catalina Caballero, AIA. Assoc., LEED GA.
Johnson, Avedano, Lopez, Rodriguez & Walewski
Engineering Group, Inc.

2510 NW 97th Avenue, Suite 220, Miami, Florida 33172
Tel. (305) 594-0660 Ext. 217 Fax (305) 594-0907

Visit us online: www.jalrw.com<http://www.jalrw.com/>

[cid:image003.jpg at 01CDDD2C.F265A6A0]

HVAC - Electrical - Plumbing - Fire Protection
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