[Bldg-sim] Baseline Modeling for LEED

[Christopher Schaffner]

Under current LEED EAc1/ASHRAE 90.1:  Use the same ventilation rate in both
base and design cases, with a few limited exceptions (read the CIRs about
lab air change rates, etc.)

This will likely evolve for LEED 2012.

Chris Schaffner, PE
Vice-Chair EA TAG 


On 11/19/09 5:19 PM, "Vikram Sami" <VSami at lasarchitect.com> wrote:

> I always assumed that if you went to 30% extra, you kept the baseline at 100%,
> and the designed building at 130%, but after reading this, it does seem to
> make sense that you would increase both occurrences.
>  
> Can anyone from the EA Tag chime in?
>  
> 
> Vikram Sami, LEED AP
> Direct Phone 404-253-1466 | Direct Fax 404-253-1366
> LORD, AECK & SARGENT ARCHITECTURE
> 
> 
>  
> 
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nathan Miller
> Sent: Thursday, November 19, 2009 4:42 PM
> To: 'Rimes, Christie'; 'Steven Rutter'; bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Baseline Modeling for LEED
>  
> I disagree, I believe the models should be same-same on ventilation rates. See
> section 90.1 (2004) Section G3.1.2.5. It states:
>  
> ³Minimum outdoor air ventilation rates should be the same for the proposed and
> baseline building designs.²
>  
> In my projects (including those that include 30% additional outside air), I
> have always used the same outdoor air flow rates, unless I was taking credit
> for demand control ventilation in the proposed case (see the exception allowed
> in that same ASHRAE section).
>  
> 
> Nathan Miller
> Senior Energy Engineer/Mechanical Engineer
> direct: 206.788.4577
> fax: 206.285.7111
>  
> 
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rimes, Christie
> Sent: Thursday, November 19, 2009 1:32 PM
> To: Steven Rutter; bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Baseline Modeling for LEED
>  
> In  my experience you do not increase the baseline energy model as you are
> being awarded (gaining that point) when you achieve the ventilation credit.
> There are a few similar situations in LEED where by achieving one credit will
> prevent you from achieving another but this happens to everyone so it works
> out to be somewhat fair.
>  
> 
> 
>  
> 
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Steven Rutter
> Sent: Thursday, November 19, 2009 1:25 PM
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] Baseline Modeling for LEED
>  
> All,
> There is a credit in LEED (EQc2.0) that involves increasing the required
> ventilation rate by 30%.  In trying to achieve this credit, the amount of
> energy would have to increase to condition that additional 30% OSA.  Does
> anyone know if you are supposed to increase the baseline energy model¹s
> ventilation rate so it has the same ventilation rate as the proposed building?
> Thank you in advance for your help.
>  
>  
> Steven Rutter, LEED® AP, EIT
>  
> 
> 3850 Happy Lane|Sacramento, CA 95827
> O:916-368-0336|F:916-368-0337|C:916-717-7484
> P Please consider the environment before printing this email.
>  
>  
> 
> 
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