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Re: [EnergyPlus_Support] Re: Air flow from one zone to another: extraction to return air duct
Wait a minute, if the air from zone 1 is moved to zone 2 and 3 using
mixing objects, isn't there a RA flow rate on zone 1 already?
Richard Raustad wrote:
>
> How about trying to connect the outlet node of the Fan:ZoneExhaust to a
> new inlet node in zone 1 (and disregard the flow imbalance warnings in
> zone 3). Does this give you a RA flow rate in zone 1?
>
> joskenzy wrote:
> >
> >
> > 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
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, 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
> <http://www.fsec.ucf.edu> <http://www.fsec.ucf.edu
> <http://www.fsec.ucf.edu>>
> > >
> > > UCF - From Promise to Prominence: Celebrating 40 Years
> > >
> >
> >
>
> --
> 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 <http://www.fsec.ucf.edu>
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
>
--
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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