[Equest-users] DOAS in baseline

[Susan F]

Nick,

So if my baseline is system 8 and I'm using 1 system per floor as indicated
in G.3.1.1, I don't really see an exception that would allow the DOAS.  Am I
missing something that would actually allow it?

Thanks,
Susan

On Thu, Jan 27, 2011 at 10:21 AM, Nick Caton <ncaton at smithboucher.com>wrote:

>  Hi Susan!
>
>
>
> Whether or not a baseline model gets a separate system for a proposed
> design featuring a DOAS is dependent on a few things, including how you
> decided to approach modeling the DOAS in the proposed model.
>
>
>
> -          A clarification first:  Type and quantity of baseline systems
> is determined first and foremost per Appendix G.3.1.1.  You generally have
> either one system per floor or one system per zone, depending on the system
> type.  You never start with “one system per proposed system” except by
> coincidence.
>
> -          *If* you use a dummy zone approach (not integrating the DOAS
> into the proposed systems), *and* you have one baseline system serving
> only the dummy zone per G.3.1.1 (or its exceptions), *and* you have
> specified the ventilation requirements at that dummy zone (not indirectly
> from the actual zones - using OA-FROM-SYSTEM for the proposed systems)… *
> then* you’ll end up with a distinct baseline system handling the
> ventilation requirements analogous to the proposed DOAS.
>
> -          In many/most cases (partially dependant on your preferred
> strategy for handling DOAS’s in your proposed models), you will not have a
> dedicated baseline system handling the ventilation air.  That’s okay.
>
>
>
> ~Nick
>
>
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway
>
> olathe ks 66061
>
> direct 913 344.0036
>
> fax 913 345.0617
>
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>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Susan F
> *Sent:* Thursday, January 27, 2011 6:11 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] DOAS in baseline
>
>
>
> This is not exactly an eQUEST question but y'all have been so helpful in
> the past so I'm hoping you can help here too.  I'm looking for a little
> clarification.  It was my understanding if you had a DOAS system that heated
> and cooled the outside air before delivering it to the floor mechanical room
> to be combined with return air and further conditioned by the AHU in your
> Proposed building that this system would NOT be modeled separately in the
> Baseline.  I cannot find anything in 90.1 that would regulate the DOAS
> system and I'm not sure how you would model it.  (I understand the dummy
> zone concept for modeling DOAS but not sure that would apply to the
> Baseline.)
>
> Should it be separate system in the Baseline and would it be VAV or
> constant volume?  And if it is a separate system what section of 90.1 would
> you reference for this?
>
>
> Thanks in advance.
>
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