[BLDG-SIM] Modeling buildings with natural ventilation for Appendix G

[gail]

Hi Ramana,

The ASHRAE Appendix G modeling protocol requires that both heating and
cooling be modeled for the entire building in both the Baseline and Proposed
design, even if no heating or cooling is included in the actual design (see
Appendix G, TableG3.1.10 (Proposed)).

According to Table G3.1.4 (Proposed), you may model the indoor fans in the
Proposed Design as cycling to show some benefit from natural ventilation,
while your budget case fans would be modeled as continuous during occupied
hours.  As far as I can tell, this is the only thing you can do to reflect
any energy savings from natural ventilation using the Appendix G modeling
methodology.

Best Regards,
Gail Stranske
CTG Energetics, Inc.



On 12/18/06, Ramana Koti <ramana.koti at gmail.com> wrote:
>
> Dear all,
>
> Is ignoring natural ventilation in both proposed and baseline designs an
> accepted/fair way of modeling based on Appendix G (ASHRAE 90.1-2004)?
>
> Part of the proposed design has (radiant heating + natural ventilation)
> with no cooling which was modeled as a radiant slab, no cooling, natural
> ventilation ignored.
>
> But the Baseline HVAC system based on Appendix G is System 5: Packaged VAV
> w/Reheat. (Natural ventilation can be modeled based on Air Change method or
> Sherman Grimsrud method though I do not know how to do it).
>
> I cannot decide how to make the baseline and proposed comparable with
> respect to Natural Ventilation (in a manner acceptable to LEED review),
> suggestions will be appreciated.
>
> Thanks,
>
> Ramana Koti, Sustainable Building Analyst
> LEED AP
>
> ELEMENTS | a division of berkebile nelson immenschuh mcdowell architects
> 106 W. 14th Street Suite 200
> Kansas City, Missouri 64105
>
> p 816.783.1635 f 816.783.1501
> www.bnim.com| elements.bnim.com
>
>


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