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

[John Aulbach]

Scott:

If you are going from a constant volume system with reheat to a VAV system, you will eliminate a ton of excess heating. The % may be large as you may not have had much heating to begin with.




________________________________
From: Jeremy McClanathan <jmcclanathan at CDiengineers.com>
To: "Tomlinson, Scott" <stomlinson at smma.com>; "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Tue, March 2, 2010 9:01:30 AM
Subject: Re: [Equest-users] [eQuest users] packaged variable volume system


The first thing I would check is simultaneous heating and cooling.  If it is a problem, check the reset temps and controls of the packaged system.  The packaged unit may be cooling the air, then tempering it at the zone level.
 
___________________________________________
 
Jeremy McClanathan, LEED® AP
CDi ENGINEERS
4200 194th St SW, Ste 200, Lynnwood, WA 98036
P 425-672-1071 | F 425-778-8769 
PPlease consider the environment before printing this email.
 
 
 
From:Tomlinson, Scott [mailto:stomlinson at smma.com] 
Sent: Tuesday, March 02, 2010 8:42 AM
To: equest-users at lists.onebuilding.org
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 
 
 
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