[Trace-users] Trace-users Digest, Vol 50, Issue 3

Tue Dec 18 13:17:58 PST 2012

Hi Catalina-

I think that Duncan's proposal is good.

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:
http://energy-models.com/blog/11-11-10/simplifying-shading-equest-and-trace-700

Basically, it comes down to simplifying virtually any shading device into 1
overhang (or fin)

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)

Best Regards,

Bob

On Tue, Dec 18, 2012 at 3:07 PM,
<trace-users-request at lists.onebuilding.org>wrote:

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> Today's Topics:
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>    1. Intricate shading devices. (Caballero, Catalina)
>    2. Re: Intricate shading devices. (Duncan S. McClellan)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 18 Dec 2012 11:25:03 -0500
> From: "Caballero, Catalina" <ccaballero at jalrw.com>
> To: "trace-users at lists.onebuilding.org"
>         <trace-users at lists.onebuilding.org>
> Subject: [Trace-users] Intricate shading devices.
> Message-ID:
>         <0B754EE940ECB849A0162ADAC4A7139101C16F265827 at mail-svr.jalrw.com>
> Content-Type: text/plain; charset="us-ascii"
>
> 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:image004.jpg at 01CDDD12.530EA170]
>
> Regards,
> 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:image001.jpg at 01CDDD11.CA21AEC0]
>
> HVAC - Electrical - Plumbing - Fire Protection
> Sustainable Development - Commissioning
>
>
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> ------------------------------
>
> Message: 2
> Date: Tue, 18 Dec 2012 14:49:59 -0500
> From: "Duncan S. McClellan" <dmcclellan at ClarkNexsen.com>
> To: "Caballero, Catalina" <ccaballero at jalrw.com>,
>         "trace-users at lists.onebuilding.org"
>         <trace-users at lists.onebuilding.org>
> Subject: Re: [Trace-users] Intricate shading devices.
> Message-ID:
>         <
> 202912C8EDB23349AE5037B8C2D2301207F9E0C30A at cn-exmbs-1.Corp.ClarkNexsen.com
> >
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> Content-Type: text/plain; charset="us-ascii"
>
> 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
>
> CLARK NEXSEN
> 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>
> www.clarknexsen.com<http://www.clarknexsen.com%20>
>
>
> 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]
>
> Regards,
> 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
> Sustainable Development - Commissioning
>
>
> This email and any files transmitted with it are confidential and are
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> addressed. If you are not the intended recipient or the person responsible
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