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

[Karen Walkerman]

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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