[Bldg-sim] PTAC should add DOAS?

[James Hansen]

Why does the PTAC not have any outdoor air?  Each PTAC should have
outside air - usually you want that rate to either be the ASHRAE 62.1
requirements, or match the proposed (there has been a lot of contention
about which, so I'd play it safe and use the ASHRAE 62.1 values).  You
don't want to add DOAS to the baseline PTACs, as that is not how
Appendix G tells you to create the baseline system.  Just assign OA to
each PTAC.

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of zhiren zhou
Sent: Friday, December 10, 2010 10:41 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] PTAC should add DOAS?

 

Dear all

       I am doing LEED-CS energy rating simulation. Part of the project
is residential type and the HVAC system for baseline is PTAC and the
proposed system is FCU+DOAs. However the PTAC system has no outdoor air
and the energy consumption of PTAC without DOAs in baseline is less than
the proposed building. So I think the PTAC system should add DOAs. 

Has anyone performed the PTAC system simulation and agree with my
opinion?

Look forward to reply! Thank you very much!

                                        

Zhiren Zhou

CABR-SH

 

 

 

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