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

Mon Mar 22 08:19:43 PDT 2010

Thank you Nick. You are completely right. I was asking this because the
solar load is needed in winter, especially in this case, because the heat
demand which is much bigger than the cold demand of the building. The fact
that I have to simulate the proposed building with external shading devices,
but the baseline building not, is giving me problems. Therefore my question.
Thanks again for the answers. Now I have it clear!

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)
Chile: Juan Bautista Pastene 3120, Vitacura, Santiago | Tel. +56 2 9813142
USA: 31 Willard St., Cambridge, MA | Tel. +1 617 710 2360
www.energyarq.com

P  Consider the environment before printing this email

De: Nick Caton [mailto:ncaton at smithboucher.com] 
Enviado el: Lunes, 22 de Marzo de 2010 10:52
Para: Hisham Ahmad; Lizzy Guhl
CC: bldg-sim at lists.onebuilding.org
Asunto: RE: [Bldg-sim] Model External Shading Devices for LEED compliance

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

cid:489575314 at 22072009-0ABB

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

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)
Chile: Juan Bautista Pastene 3120, Vitacura, Santiago | Tel. +56 2 9813142
USA: 31 Willard St., Cambridge, MA | Tel. +1 617 710 2360
www.energyarq.com

P  Consider the environment before printing this email

__________ Información de ESET NOD32 Antivirus, versión de la base de firmas
de virus 4964 (20100322) __________

ESET NOD32 Antivirus ha comprobado este mensaje.

http://www.eset.com

_______________________________________________
Bldg-sim mailing list
http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

-- 

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

__________ Información de ESET NOD32 Antivirus, versión de la base de firmas
de virus 4964 (20100322) __________

ESET NOD32 Antivirus ha comprobado este mensaje.

http://www.eset.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20100322/9f367b0d/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20100322/9f367b0d/attachment.jpeg>