[Bldg-sim] DOAS and baseline OA

[Jim Dirkes]

Dear Anne,

I'm not sure why you think the OA requirement varies by system.  I'm not
well versed in Standard 62, but my basic understanding is that one of the
calculation methods is the result of building area and number of occupants.
Those are unchanged by system selection . which is why it makes sense for
Appendix G to require matching volumes.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Anne Juran
Sent: Tuesday, August 16, 2011 8:33 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] DOAS and baseline OA

 

I'm curious how everyone is handling the OA for Appendix G simulations when
using a DOAS in the proposed system.  We have a design that is DOAS + FCU
with a  total OA of 8,000 CFM.  When you run the OA calcs for this same
building with a VAV system (the baseline), the total OA required to meet
Standard 62 is 39,000 CFM.  This difference in OA represents a significant
energy savings (in climate zone 4A), yet Appendix G requires the OA volumes
to match.  It does not seem "fair" to me that the proposed case cannot take
credit for design choice when it comes to OA.  I feel like Appendix G should
make an exception for DOAS.  Am I missing something?  Is there a way around
this?  Any thoughts are appreciated!

 

Anne

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20110816/02c5c00e/attachment-0002.htm>