[Equest-users] DOAS in baseline

[Paul Diglio]

Nick:

If you do not use the OA From System how will eQuest calculate the CFM required 
by varying occupancy?  In addition, since the DOAS system might not provide the 
supply air temperatures required eQuest will not correctly calculate the energy 
required to condition the OA.

Paul Diglio




________________________________
From: Nick Caton <ncaton at smithboucher.com>
To: Susan F <modelsenergy at gmail.com>; equest-users at lists.onebuilding.org
Sent: Thu, January 27, 2011 10:21:55 AM
Subject: Re: [Equest-users] DOAS in baseline


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.
-          Ifyou 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
 
 
NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com
 
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.
olathe ks 66061
Nick:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110127/e040d1b3/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110127/e040d1b3/attachment-0001.jpeg>