[Bldg-rate] [Bldg-sim] PSZ-AC

[Dan Russell]

Eric, 

 

I understand System 3 (PSZ-AC) to be a standard packaged rooftop that
may serve multiple "spaces", but only serves a single "thermal zone".
In other words, there is only one thermostat that controls the entire
unit.

 

Your baseline should have a separate PSZ-AC for each thermal zone
depicted by your HVAC drawings.  Note that adjacent thermal zones with
similar load characteristics (light/equip gain, people count, exterior
exposure, etc.) may be lumped into a single thermal zone for modeling
purposes (i.e. less zones = simpler model).

 

Hope that helps.

 

 Dan Russell, EIT 

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eric
Youngson
Sent: Thursday, September 04, 2008 3:33 PM
To: bldg-sim at lists.onebuilding.org
Cc: bldg-rate at lists.onebuilding.org
Subject: [Bldg-sim] PSZ-AC

 

Sim List,

                ASHRAE system 3 is, Packaged Single Zone Air Conditioner
(PSZ-AC). The description of PSZ-AC says, "Packaged rooftop air
conditioner". I assume that this means a single unit serving multiple
zones. This doesn't seem to make sense since the name contains the
phrase 'single zone'.

                I have a building with baseline system 3, PSZ-AC and I'm
not sure how to apply this system. The proposed building has a variety
of systems. Should I have a system per zone or a single unit for the
building?

 

Thanks

 

  <http://www.pae-engineers.com/> 

Eric Youngson 

 

PAE Consulting Engineers, Inc. 



503.226.2921 Main
503.542.0567 Direct
503.226.2930 Fax
ericy at pae-engineers.com 

Mechanical 

808 SW Third Avenue - Suite 300
Portland, OR 97204-2426
www.pae-engineers.com 

inspire  interpret  integrate 







-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-rate-onebuilding.org/attachments/20080904/9a817a9e/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 7994 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/bldg-rate-onebuilding.org/attachments/20080904/9a817a9e/attachment-0002.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2029 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/bldg-rate-onebuilding.org/attachments/20080904/9a817a9e/attachment-0003.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 143 bytes
Desc: image003.png
URL: <http://lists.onebuilding.org/pipermail/bldg-rate-onebuilding.org/attachments/20080904/9a817a9e/attachment-0001.png>