The way to get 100% OA in an AirLoopHVAC is to use the Minimum Fraction of Outdoor Air Schedule in the Controller:OutdoorAir object, and set it to 1.0 all the time.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of ntraughpee
Sent: Tuesday, November 01, 2011 12:29 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Fresh Air Issues
PS: and I don't just mean this system but any system?
I work for a University and we have a lot of labs which require 100% FA that in the future we will likely want to model and I am currently at a loss as how to arrange the model to show this.
I have tried searching but can't seem to find an acceptable answer.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jim Dirkes" <jim@...> wrote:
>
> Dear Matthew,
>
> Thinking about it more..
>
> The AirTerminal:DualDuct:ConstantVolume object should do the trick for you.
> The physics are all the same as a multi-zone system. Check out the IO
> Reference, pages
>
> . 569 (610 in the PDF) for air loop node creation
>
> . 1038 (1079) for the AirTerminal description
>
>
>
> This type of system will often run with a constant hot deck discharge temp
> and also a constant cold deck discharge temp year 'round. The hot deck
> sometimes is allowed to be just mixed air in the warm weather months (when
> no real heat is required. The cold deck becomes just mixed air in the cold
> weather months. Although the deck discharge temps can remain constant, they
> are sometimes reset based on outdoor air temps.
>
>
>
> There are several example files which should be helpful (I have not looked
> at them, however)
>
> . DDAutoSize.idf
>
> . DualDuctConstVolDamper.idf
>
> . DualDuctConstVolGasHC.idf
>
>
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