[Equest-users] [eQuest users] packaged variable volume system

[Hwakong Cheng]

Here are some thoughts, not knowing anything about your building or your climate...

 

1. A central VAV system can have a lot of reheat, whereas your PSZ systems should have no reheat. That can be a big savings in gas use.

2. Did you check whether all of the zones are satisfied throughout the year in both runs (unmet hours)?

3. Are you modeling SAT reset in your baseline? 


If all else fails, look at some hourly reports to make sure that the models are doing what you're expecting them to be doing.

 

Good luck!

Hwakong
 


From: stomlinson at smma.com
To: equest-users at lists.onebuilding.org
Date: Tue, 2 Mar 2010 11:42:14 -0500
Subject: [Equest-users] [eQuest users] packaged variable volume system







I have a question regarding HVAC system types in eQuest.  My baseline building is modeled as a packaged variable volume system (It is a System 5) while my design building is mostly modeled as a bunch of packaged single zone systems.  For some reason I am getting a 70% reduction in gas consumption, even thought my efficiencies are pretty similar.  This reduction seems unreasonable.  Is there something about the packaged variable volume system  in eQuest that I don’t know about?  What type of system do people usually use for a system 5?
 
-          Thanks,
 




__________________________________________


Scott Tomlinson, PE, LEED-AP


Mechanical


Symmes Maini & McKee Associates, Inc.


1000 Massachusetts Avenue, Cambridge, MA 02138


t: 617.520.9438



 


f: 617.354.5758


stomlinson at smma.com


www.smma.com
 
  		 	   		  
_________________________________________________________________
Hotmail: Trusted email with Microsoft’s powerful SPAM protection.
http://clk.atdmt.com/GBL/go/201469226/direct/01/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100304/cfeb1760/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 14792 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100304/cfeb1760/attachment.jpg>