[EnergyPlus_Support] Re: schedule on the fresh air rate of a CAV, possible ?

["Jean marais" <jeannieboef@xxxxxxxxx>]

Hi Geert,
If each zone is demanding different air volumes which vary across the day AND the sum total varies, then obviously you can't usually use a fan system that is constant volume (CAV). For CAV the total must remain the same. A CAV system with variable terminal dampers in the zones will probably require a duct bypass around the AHU (I think this can be realised in e+) so that when the max demand sum from the zones drops below the max of the CAV fan, it can be blown straight out the exhaust.

5ZoneSupRetPlenRAB.idf

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Geert Bellens" <geert.bellens@...> wrote:
>
> Fransesco, Richard,
> 
>  
> 
> Thanks. So I have to alter the 'minimum outdoor air schedule' at coltroller
> level.
> 
> This works, but only at AHU level. All the zones have to follow this
> schedule. 
> 
>  
> 
> What if I want to have zones with different schedules?
> 
>  
> 
>  
> 
> Geert
> 
>  
> 
>  
> 
> Van: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Namens Richard Raustad
> Verzonden: 13 February 2013 16:28
> Aan: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Onderwerp: Re: [EnergyPlus_Support] schedule on the fresh air rate of a CAV,
> possible ?
> 
>  
> 
>   
> 
> You should be using CAV, not VAV.
> See the HeatPump.idf with cycling CAV or 
> HeatPumpAirToAirWithRHControl.idf with constant CAV.
> 
> On 2/13/2013 5:45 AM, Geert Bellens wrote:
> > I want to put a schedule on the fresh air rate of a 100% fresh air CAV
> system. The zones have all different air rates depending on the time of the
> day varying between 20 and 100%. I have the impression that this is not
> possible...?
> >
> > I I use a VAV, the air rates are controlled by the indoor temperature,
> which is not what I want.
> >
> > Geert
> >
> >
> >
> >
> >
> > ------------------------------------
> >
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> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
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