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[EnergyPlus_Support] Re: AHU air loop fresh air distribution management



Hi,

Yes you are right, that was silly question of course the supply airflow rate is lower than the fresh airflow rate in these zones due to their very high fresh air requirement. then I guess I should do a dedicated AHU loop for these two zones and choose to size the system according to ventilation requirement instead of sensible load...

Thanks a lot,
Aymeric

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
>  From the notes in the IDD, the terminal unit flow rate cannot be 
> greater than the maximum air flow rate. Are you sure the flow rate can 
> go higher?
> 
> AirTerminal:SingleDuct:VAV:Reheat,
>    A11; \field Design Specification Outdoor Air Object Name
>         \type object-list
>         \object-list DesignSpecificationOutdoorAirNames
>         \note When the name of a DesignSpecification:OutdoorAir object 
> is entered, the terminal
>         \note unit will increase flow as needed to meet this outdoor air 
> requirement.
>         \note If Outdoor Air Flow per Person is non-zero, then the 
> outdoor air requirement will
>         \note be computed based on the current number of occupants in 
> the zone.
>         \note At no time will the supply air flow rate exceed the value 
> for Maximum Air Flow Rate.
>         \note If this field is blank, then the terminal unit will not be 
> controlled for outdoor air flow.
> 
> 
> On 7/11/2011 9:47 PM, aymericnovel wrote:
> >
> > Dear all,
> >
> > I realized that my AHU VAV air loop is doing something weird that I 
> > don't know how to control:
> >
> > The total amount of fresh air as it is in the main air stream is 
> > correct. But the splitter does not seem to distribute the fresh air as 
> > it is asked by Sizing:zone. I do not find the right amount of fresh 
> > air in each zone despite the fact total is correct. Energy wise it 
> > doesn't matter but if I want to calculate humidity and CO2 
> > concentration it does.
> >
> > I have tried to insert the DesignObject: Outdoor air at the VAV:reheat 
> > level since it is supposed to give some outdoor air requirement at the 
> > termainla unit level but it didn't change anything.
> >
> > So did I use it wrong or is there another trick I haven't figured out?
> >
> > Thank you for your help,
> > Aymeric
> >
> > 
> 
> -- 
> 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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