[Bldg-sim] Model External Shading Devices for LEED compliance

[Nick Caton]

I think I can clarify the discussion.

 

First, baseline shading projections are NOT an option in 90.1-2007.  

 

TG3.1, Baseline Building Performance, Section c.  :  "...All vertical glazing shall be assumed to be flush with the exterior wall, and no shading projections shall be modeled..."

 

To answer Hisham, the reason you might want to (even though you're not allowed to), is that in some instances permanent fenestration shades can be detrimental to your annual energy performance.  Such shades almost always simultaneously help and hurt your HVAC systems - as they block solar load contributions in the summer (when you don't want them), but also in the winter (when you do).  Glare issues aside, identical permanent shades/fins can easily be thermally helpful on one orientation but not another for the same project.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

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Check out our new web-site @ www.smithboucher.com 

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Hisham Ahmad
Sent: Monday, March 22, 2010 7:43 AM
To: Lizzy Guhl
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Model External Shading Devices for LEED compliance

 

Hi,

The baseline has to be modeled as per G3.1.5 which does not require shading devices to be modeled. Why would you want to model them in the baseline ?? This will only compromise your energy savings.

On 22 March 2010 18:01, Lizzy Guhl <lizzy.guhl at energyarq.com> wrote:

Thanks for the fast reply. But it is possible, anyway, to model the baseline building with external shading devices, right?

 

De: Hisham Ahmad [mailto:hisham at edsglobal.com] 
Enviado el: Lunes, 22 de Marzo de 2010 7:58
Para: Lizzy Guhl
CC: bldg-sim at lists.onebuilding.org
Asunto: Re: [Bldg-sim] Model External Shading Devices for LEED compliance

 

Hi,

Appendix G allows you to claim credit for shading designs/devices. Therefore, the baseline building is not required to have shading devices/projections.

On 22 March 2010 17:22, Lizzy Guhl <lizzy.guhl at energyarq.com> wrote:

Dear All,

 

I am new to Leed compliance simulations and I would like to know how to model external shading devices in the proposed and baseline building. Appendix G, Table G3.1 - 5. Building Envelope, is clear about permanent shading devices being allowed for the proposed building. But what about the baseline building? Do you model the external shading devices in the baseline building as well?

 

I´d appreciate any help on the matter.

 

Regards,

Lizzy

 

 

LIZZY GUHL
Dipl. Ing. (FH) Mechanical Engineering | Sustainable Design Consultant

 

ENERGY A R Q
Sustainability | Energy | Building Simulations | LEED®
Member of the United States Green Building Council (USGBC)
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www.energyarq.com

 

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-- 

Regards
Hisham Ahmad

Energy Analyst
Environmental Design Solutions Pvt Ltd.
www.edsglobal.com
New Delhi, India
+91-9873065488




-- 

Regards
Hisham Ahmad

Energy Analyst
Environmental Design Solutions Pvt Ltd.
www.edsglobal.com
New Delhi, India
+91-9873065488

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