[Bldg-sim] Baseline Modeling for LEED

[Hintz, Scott F]

To add to this the ECB subcommittee of ASHRAE 90.1 has ruled an interpretation restating that the ventilation requirements of G3.1.2.5 are "energy neutral." Otherwise stated the total ventilation requirement (i.e. building total outdoor air intake flow) for the proposed model must be the same as the baseline model.

Scott Hintz, LEED(r) AP
C.D.S. Marketing Engineer

Trane Commercial Systems

Ingersoll Rand

3600 Pammel Creek Road

La Crosse, WI 54601-7599



Office +1 608 787 2196

Fax +1 608 787 3005

Email:  scottf.hintz at trane.com<mailto:scottf.hintz at trane.com>
Website:  www.trane.com<http://www.trane.com/>
________________________________
From: Christopher Schaffner [mailto:chris at greenengineer.com]
Sent: Friday, November 20, 2009 10:32 AM
To: Vikram Sami; Nathan Miller; Rimes, Christie; Steven Rutter; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Baseline Modeling for LEED

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:

"Minimum outdoor air ventilation rates should be the same for the proposed and baseline building designs."

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.


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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 model's ventilation rate so it has the same ventilation rate as the proposed building?  Thank you in advance for your help.


Steven Rutter, LEED(r) AP, EIT

[cid:image002.jpg at 01CA69ED.6F8EDE00]
3850 Happy Lane|Sacramento, CA 95827
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