[Bldg-sim] ASHRAE 90.1-App G: Site Shading

Kevin Kyte kkyte at robsonwoese.com
Thu Jun 5 08:22:26 PDT 2008


What if there is existing conditions and no know gives you anything and all
they keep saying to you when you ask about it repeatedly that there is 3" of
insulation?

 

 

From: gail [mailto:gail22 at gmail.com] 
Sent: Thursday, June 05, 2008 11:15 AM
To: Kevin Kyte
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1-App G: Site Shading

 

Even if it is going LEED-NC or Core & Shell, the applicable ASHRAE
Performance Rating Method (ASHRAE 90.1-2004 Appendix G Table G3.1(5)(f))
states that the baseline envelope should be modeled with existing conditions
prior to any retrofit.  The envelope for additions to the existing building
should be modeled with the applicable ASHRAE Building Envelope Requirements
table and corresponding Appendix G Table G3.1(5) requirements.

LEED for existing buildings uses benchmarking for comparison, not energy
modeling.

On Thu, Jun 5, 2008 at 5:27 AM, Kevin Kyte <kkyte at robsonwoese.com> wrote:

What if it's an existing building, but the project is going LEED-NC or Core
and Shell.  Does the baseline get modeled as the existing conditions of the
building before demo? If a project is going for LEED -existing buildings,
then the baseline energy model should be with existing conditions.  What
delegates whether the baseline model should be an ASHRAE perpetration or
existing conditions?

 

Kevin Kyte, LEED AP

RobsonWoese, Inc.

(T) 716-636-1800

(F) 716-636-1856

http://robsonwoese.com <http://robsonwoese.com/index.php> 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of gail
Sent: Wednesday, June 04, 2008 5:01 PM


To: bldg-sim at lists.onebuilding.org

Subject: Re: [Bldg-sim] ASHRAE 90.1-App G: Site Shading

 

Appendix G does specifically state that for existing buildings being gutted,
the Baseline building envelope should be modeled based on the existing
conditions prior to any revisions that are part of the scope of work being
evaluated (Table G3.1(5)(f)).  Therefore, if you are modeling self-shading
and adjacent buildings in the proposed case for an existing building, they
should also be modeled in the base case for existing buildings.

Best Regards,
Gail Stranske
CTG Energetics, Inc.

On Wed, Jun 4, 2008 at 1:32 PM, Demba Ndiaye <demba.ndiaye at setty.com> wrote:

Eric, 

 

My understanding is that, regardless of the fact that the building is new or
existing, there is no specific requirement regarding the modeling of
neighboring shading objects.

 

______________

Demba Ndiaye

  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eric Studer
Sent: Wednesday, June 04, 2008 3:47 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1-App G: Site Shading

 

Hello,

 

ASHRAE 90.1-2004 Appendix G has a clause pertaining to self-shading of the
baseline building, but there does not seem to be any explicit direction
regarding shading from other objects beyond the building envelope (trees,
buildings, etc).  Should the base case be modeled as being impacted by
adjacent buildings or other objects?  Would this be different for a new
building versus an existing building that is being gutted?

 

Thanks

 

                                      

 

Eric Studer, PE, LEED AP
DMI
35 Walnut Street
Wellesley, MA  02481
Ph:   (781) 431-1100 ext 12
Fax:  (781) 431-1109
e-mail:  estuder at dmiinc.com

 


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