[BLDG-SIM] Baseline for Garage Ventilation using Performance Rating Method, LEED-CS 2.0

[gail]

I would certainly like to take the Option 2 approach mentioned for all the
projects I'm submitting, but I'm pretty sure it's not allowed:

Table 11.3.1.12 specifically lists garage ventilation fans (and exhaust fans
also) as a "Miscellaneous load".  Per the requirements of that section, the
loads "shall be assumed to be identical in the proposed and budget building
design"

This seems to indicate that Option 1 is the only option that would comply
with the requirements of Appendix G.

Best Regards,
Gail Stranske
CTG Energetics, Inc.

On 4/20/07, Bill Talbert <btalbert at aeieng.com> wrote:
>
>  Neeraj,
> I would agree that your interpretation and your proposed 'option 2' appear
> to be meeting the requirements of App G. The LEED NC V2.2 Reference Guide
> (refer to EA Credit 1 Calculations for 'Other Systems,' page 182) indicates
> that where specific energy efficiency requirements exist in A90.1, the
> lowest allowable efficiency shall be used for the Baseline. Garage
> ventilation is included in the sample listing of 'other' systems and the fan
> power allowance should apply to that system. Not sure whether LEED CS V2.0has something equivalent.
>
> That said, I am not a LEED reviewer. It would be interesting to hear what
> others think on this as the fan power allowance is likely easy to beat for a
> ventilation only system where system pressure drop is minimal. I would
> expect that the intent of App G may not be to 'credit' these types of
> systems.
> Bill Talbert, AEI
>
> >>> neeraj <near_ej at yahoo.com> 4/20/2007 1:14 PM >>>
>  Hi all,
>
>    - LEED, Core and Shell V2.0
>    - A 300,000 sqft building, 12 stories above ground located in
>    Washington DC. The baseline building is System # 8, i.e. VAV fan
>    controlled, PIU, all electric heating and cooling.
>    - Problem Area -- To determine a correct Baseline: In the proposed
>    design, 3 levels of underground parking garage are merely ventilated with
>    constant volume fans and they are not equipped with CO/NOx sensors ,
>    i.e. they are merely constant volume, SA and EA fans.
>    - We know that garage ventilation is not process energy, so it must
>    be regulated somehow, right?! Plus, we cannot take credit for energy savings
>    from OA ventilation air (according to Appendix G). Now, since this is a
>    'fans only' situation in both the models (no cooling or heating) I have
>    assumed the CFM of OA ventilation air must be the same in both cases. Am I
>    correct, so far?
>    - Using this as a premise, the following two contradicting scenarios
>    for an appropriate baseline model can reasonably  be thought of:
>       1. Model similar SA and EA CFM as in the "Proposed Building
>       Model" with similar fan power kW/CFM, OR
>       2. Model similar SA and EA CFM as in the "Proposed Building
>       Model" but calculating the fan power for the OA flow using Section
>       G3.1.2.9 of the Informative Appendix G of ASHRAE 90.1-2004.
>
>  THE BIG QUESTION(s): Is the second option a valid approach for
> determining fan power (kW/CFM) for the baseline?
> OR
> Is the method only meant for determining (and thus crediting/penalising)
> system supply air fans and not parking garage fans?
>
> Thanks,
> Neeraj
>
>
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