[Equest-users] EPACT 179d ventilation reiqurements
sjacobseng at gmail.com
Mon Oct 22 11:43:36 PDT 2012
That's been my process also. I've worked on some older buildings that have
little or no ventilation. The tax incentive rewards their poor IAQ.
On Mon, Oct 22, 2012 at 11:48 AM, Patrick J. O'Leary, Jr. <
poleary1969 at gmail.com> wrote:
> i have followed the 62-1999 rates for the baseline. as the epact
> requirements state the 90.1-2004 app g method has been modified to meet the
> requirements of epact. this is one the differences. it is my
> understanding that where there is a difference between epact requirements
> and 90.1-2004 modeling requirements the epact requirement takes precedence.
> On 10/22/12 10:35 AM, Steve Jacobs wrote:
> Hi everyone,
> I have a question about the ventilation requirements for 179d modeling.
> The NREL guidelines state to use 62-1999 for the baseline and the actual
> rates for the proposed building. I'm so use to modeling ventilating rates
> the same in both models I wanted to make sure I'm interpreting this
> correctly. I've been doing separate 62 calculations per ASHRAE 62-1999 for
> the baseline. This can make a significant difference in the OA rates
> between the baseline and proposed. The 1999 rates are higher than the
> 2004/2007 rates for some building area types. Also, if the baseline model
> is a VAV system with a critical zone driving the OA rate, the difference
> can be even greater.
> How have you guys handled this situation?
> On a separate note, has anyone done epact for building on a central plant.
> Obviously it is not covered by the NREL guidelines, so it seems like it is
> on the engineer to come up with a reasonable interpretation.
> - Steve
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