[Bldg-sim] LEED Increased Ventilation Credit and Energy Modeling

[Alex Krickx]

Great comments all, and correct for LEED v3.

This is changing in the new LEED v4. It references ASHRAE 90.1 2010 which
does *not *match the baseline Ventilation rate to a proposed design that
exceeds the rates set by the rating authority or building official.

This matches Jim's comments - a high ventilation rate will be penalized
under LEED v4, since the baseline is the minimum, and the proposed matches
the higher value of the design.

Cheers,
Alex

*Alex Krickx* | LEED AP
Project Engineer
*Integral Group *| 427 13th Street | Oakland CA USA 94612
T 510.663.2070 x 247
integralgroup.com <http://www.integralgroup.com/> | *akrickx at integralgroup.com
<akrickx at integralgroup.com>*

*Trust* | *Nurture* | *Inspire*

Please consider the environment before printing this email.


On Thu, Mar 6, 2014 at 6:41 PM, Karen Walkerman <karen at secondlaw.biz> wrote:

> Jim,
>
> In my understanding the increased ventilation LEED point was created in
> response to a deduction in the required ventilation rates by ASHRAE between
> versions of 62.1. The confusion around how this affected the energy credit
> came later.
>
> I have to say:
>
> ·         I have not followed the GBCI closely on this topic,
>
> ·         But it seems like the credit was created to "compare and
> contrast" the benefits of increased IEQ against the known energy penalty.
>
> ·         If that's true, then the Baseline should be per 62.1 and
> Proposed at 1305 of the Baseline.
>
>
>
> *James V Dirkes II, PE, BEMP, LEED AP*
> *www.buildingperformanceteam.com*<http://www.buildingperformanceteam.com/>
> *Energy Analysis, Commissioning & Training Services*
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *West, Scott P
> *Sent:* Thursday, March 06, 2014 4:24 PM
> *To:* 'Karen Walkerman'; 'Joe Chappell'
> *Cc:* 'bldg-sim at lists.onebuilding.org'
> *Subject:* Re: [Bldg-sim] LEED Increased Ventilation Credit and Energy
> Modeling
>
>
>
> I have to agree with Karen on this.  For LEED modeling at least, you can
> model the ventilation rates the same even if they are above 62.1 minimums.
> I would add though that you could apply Addendum bj to 90.1-2007 which add
> an exception to this for ventilation systems that improve air distribution
> effectiveness (primarily displacement ventilation systems).  I'm not sure
> if USGBC has ruled on this specifically but they generally allow one to
> adopt 90.1 addenda as long as you state which ones you're using.  This
> addendum also adds an exception for DCV similar to what Karen mentioned.
>
>
>
> Scott P. West, P.E., LEED AP BD+C, BEAP, BEMP | *JACOBS* | Mechanical
> Engineer | Energy & Power Solutions | 817.222.8512 office | 817.897.1882cell
> | scott.west at jacobs.com <rick.zilar at jacobs.com> | www.jacobs.com |
> www.jacobs.com/energyportfolio
>
>
>
> *From:* Karen Walkerman [mailto:karen at secondlaw.biz <karen at secondlaw.biz>]
>
> *Sent:* Thursday, March 06, 2014 2:55 PM
> *To:* Joe Chappell
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] LEED Increased Ventilation Credit and Energy
> Modeling
>
>
>
> There has been lots of discussion and misinformation about this in the
> past.  I believe the current take on this from a LEED perspective is that
> for each space in the proposed design where ventilation is above the
> required minimum AND there is demand controlled ventilation, the equivalent
> space in the baseline design shall be modeled with the minimum required
> ventilation as per ASHRAE 62.1.  For all other cases, baseline ventilation
> rates should match the proposed ventilation rates, regardless of whether
> the proposed design uses an increased ventilation rate or not.
>
>
>
> --
>
> Karen
>
>
>
> On Thu, Mar 6, 2014 at 3:50 PM, Joe Chappell <JoeC at designengineers.com>
> wrote:
>
> Good day,
>
>
>
> I have a question regarding the LEED credit for Increased Ventilation
> (IEQc2).  This is the credit awarded for exceeding ventilation in all
> spaces by 30% beyond the ASHRAE standard 62.1 requirements.  It seems
> obvious that the design model ventilation rates would be those 30% higher
> than 62.1 requirements.  What then would the baseline model ventilation
> rates be?
>
>
>
> If you strictly follow 90.1 Appendix G, you should always model baseline
> and proposed equivalent except for when taking credit for demand controlled
> ventilation.  However, it seems in this case that it could also be argued
> (by LEED) that you should model the ASHRAE 62.1 required ventilation rates
> in the baseline model, not those that are 30% higher and therefore pay the
> energy expense( most climates) for increased outside air.
>
>
>
> Does anyone have any experience with LEED on this issue?  Thanks in
> advance.
>
>
>
> Kind regards,
>
> *Joe Chappell*
>
>
>
>
>
>
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