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

[Karen Walkerman]

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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