[Trace-users] Split System with DOAS for LEED (UNCLASSIFIED)

[Bob Fassbender]

John/Other Bob-

Yes, I see where the confusion comes in. Sorry about that. I was answering
Robert's question, which I interpreted as, "should I model as 1 system -
with no DOA?" or "1 system with 1 cooling coil only".

*To clarify, it should be modeled as 1 system + 1 dedicated OA
system/unit*(which many people refer to as two systems, but TRACE does
not! Thus, the
confusion). Anyway, I hope that clarifies what I meant. The method that John
suggested (of two actual systems in TRACE, is a possibility I suppose - this
is what many eQUEST users do).

However, you really should take advantage of TRACE's ability to model DOA,
which is a feature that other programs don't have.

Regarding John's question

Yes, TRACE will know where to recover energy. If you have a fan coil system,
and specified DOA, plus energy recovery:

Model the DOA, as mentioned earlier
Then, add the energy recovery.
It is critical that you specify the deck locations (that way TRACE will know
that it affects the DOA unit, and not the FCU).
Specify the decks, as ventilation deck and exhaust side deck and VOILA!

TRACE understands that the ventilation deck goes to the DOA, and is also
pre-conditioned by the exhaust air.

Please let me know if there is other confusion.

Bob Fassbender




On Fri, Feb 4, 2011 at 10:24 AM, Eurek, John S NWO <
John.S.Eurek at usace.army.mil> wrote:

> Classification: UNCLASSIFIED
> Caveats: NONE
>
> Bob(s)
>
> Mr. Fassbender, Your answer confuses me.
>
> You say it is not acceptable to model as 1 system, but the image you
> attached shows that you are using the "dedicated OA" tab.
>
> The second concern I have is that my outside air unit has energy recovery,
> but the fan coils do not.  Like Mr. Arnott's system, the heating and
> cooling
> unit is return only with no outside air.  So if I make a fan coil system,
> then input the information under the 'dedicated OA' tab, if I input my
> energy recovery under with 'options' tab will Trace know to credit the
> energy recovery to the DOA unit, because the fan coil has no energy
> recovey.
>
> Mr. Fassbender, can you explain what you meant by not modeling with 1
> system?
>
> Also, I need to look deeper into the exhaust situation, thanks for the tip
> before I even needed it.
>
>
> John Eurek PE, LEED AP
> Mechanical Engineer,
> US Army Corps of Engineers
> Omaha District CENWO-ED-DA
> 1616 Capitol Avenue
> Omaha, NE 68102
> Phone: (402) 995-2134
> email: john.s.eurek at usace.army.mil
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20110204/27a2460e/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ERV for DOA.jpg
Type: image/jpeg
Size: 19336 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20110204/27a2460e/attachment-0002.jpg>