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[EnergyPlus_Support] Re: 100% fresh air with local heating and cooling

Thanks for the pointer - that's a step in the right direction.  My outdoor air rate is now reducing in sync with the space occupancy, but the total system flow rate is still fixed at the maximum (so there is some recirculation), presumably because the air system is trying to meet the space heating/cooling load.  What I would like to happen is for the air system flow rate to be determined by the outdoor air demand.  Is there a controller that achieves this?  I guess I could try using a scheduled set point manager to set the fan mass flow rate, but is there a better way?

I'm using AirTerminal:SingleDuct:Uncontrolled units to deliver the air to the space, so I'm a bit unclear about exactly what is setting the system flow rate.  Maybe I need a different terminal unit? 

Thanks,

Andy 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> See documentation for Controller:MechanicalVentilation (V3.0).
> 
> andystone101 wrote:
> >
> > Hi,
> >
> > I'm trying to model a building which has an air handling unit with 
> > heat recovery supplying 100% fresh air to a number of rooms at roughly 
> > room temperature and has local heating and cooling systems in each 
> > room. Is there an example somewhere showing how to set this up?
> >
> > The problem that I am having is getting the AHU to supply 100% fresh 
> > air with the flow rate varying according to the occupancy of the space 
> > (my outdoor air demand is related to space occupancy). Things I've tried:
> > - Using the economiser to force 100% fresh air, but that seems to 
> > disable the heat recovery system.
> > - Fixing the minimum outside air rate to be the same as the system 
> > flow rate, but then the flow rate doesn't change with occupancy.
> > - I've managed to get the right fresh air rate but with recirculated 
> > air included (basically the default behaviour).
> >
> > Do I need to manually add up all of the zones' fresh air demand and 
> > create a schedule for that? I was hoping to get the sizing routines to 
> > do the work for me - any pointers?
> >
> > Thanks in advance,
> >
> > Andy
> >
> > 
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>




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