[EnergyPlus_Support] Re: Zone exhaust fan example

["boulder1259" <EPlusUser@xxxxxxxxx>]

Thanks!

When used with a PTAC, which node should be the exhaust fan's inlet node and which 
should be its outlet node?  I ask because if the HVAC Diagram is not working, I'm not 
quite sure how to check my work.

-Greg

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> The unbalanced air flow warning is just that, a warning to let you know 
> the supply and return (and I think exhaust) flows do not match. The 
> warning is telling you to add mixing or cross-mixing objects to account 
> for the imbalance. You will still get the warnings though. Report the 
> supply, return, and exhaust node volumetric flow rates, set up mixing 
> objects to account for the imbalance. There is also a known issue with 
> HVAC Diagram with that example file. We are working on the solution.
> 
> boulder1259 wrote:
> >
> > I have a five zone building in which outside air enters through the 
> > core zone, and then it is
> > distributed (via cracks around doors, etc) into the four perimeter 
> > zones. I looked through the
> > archives and found a thread (Air Flow between Zones, answered Jan 26, 
> > 2008) that explained
> > how to do this, but I can't get the suggested solution with a zone 
> > exhaust fan to work. I
> > have two problems:
> >
> > 1) Unbalanced airflow (In zone 873, there is unbalanced exhaust air 
> > flow...)
> > 2) The HVAC diagram does not get drawn (Started HVAC Diagram... 
> > Ancestor to the following
> > box is a splitter: OUTSIDE AIR BALANCING FAN)
> >
> > I looked at 5ZoneEndUses.idf, and it seems to have errors, too 
> > (unbalanced airflow, HVAC
> > Diagram errors). Consequently, I don't have a working example that I 
> > can use to get my
> > simulation running.
> >
> > I'd appreciate any help you can offer.
> >
> > Thanks,
> > Greg
> >
> >  
> 
> -- 
> 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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