[EnergyPlus_Support] Re: Air flow from one zone to another: extraction to return air duct

["joskenzy" <joskenzy@xxxxxxxxx>]

No I haven't, but I don't really see how this could solve my problem:

1) If I use a Fan:ZoneExhaust in zone 3, the air flow balance for this zone will fail (there is 
no supply air, no return air, only exhaust air) ? I believe ZoneMixing is not taken into 
account in the air flow balance?

2) If I connect the Fan:ZoneExhaust in zone 3 to the air inlet node of my heat exhanger 
(HeatExchanger:Dessicant:BalancedFlow), than I cannot connect the return air duct of the 
other zones (there are 14 other VAV-zones in my building, apart from the 3 zones 
considered in my example) to this HX ?

Thank you anyway, I appreciate your effort!


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Have you tried connecting the outlet of the Fan:ZoneExhaust in zone 3 to 
> the heat exchanger ?
> 
> joskenzy wrote:
> >
> > Could anyone help me implement the following ventilation concept:
> >
> > Say the building has 3 zones: treated air (SingleDuct:VAV:Reheat) is
> > injected in the first zone. The same air flow rate passes from the
> > first, through the second and into the third zone.
> >
> > There is no treated air injected in the second or the third zone.
> >
> > An air flow rate equal to the injection rate in zone 1 is extracted
> > from zone 3.
> >
> > Normally, one would suggest to supply air to zone 1 and to use a
> > Fan:ZoneExhaust to balance air flows. Using ZoneMixing, you can
> > simulate air flowing from zone 1 to zone 2, and air flowing from zone
> > 2 to zone 3.
> >
> > However (now comes the hard part): the building has other VAV-balanced
> > zones, and I want to add the extracted air from zone 3 to the return
> > duct of the other zones because the return air is used in a heat-
> > exchanger.
> >
> > So for zone 3, I have an air flow entering the zone because of the
> > ZoneMixing (zone 2 as source zone), but how can I add the replaced
> > zone air to the air in the return duct?
> >
> > I looked at the manual and at previous topics here, but I only found
> > that ZoneMixing adds air to a zone, while supposing an equal flow rate
> > has left the zone (without knowing where the air went)..
> >
> > I would really appreciate your help!
> >
> > 
> 
> -- 
> 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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