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[EnergyPlus_Support] Re: Insert exhaust



when applying the Zone exhaust nodes in equipment connections for the extra wc exhaust, should I also list the air loop zone exhaust node?

ZoneHVAC:EquipmentConnections,
  Underground:Basement,                                    !- Zone Name
  Underground:BasementEquipment,                           !- Zone Conditioning Equipment List Name
  Underground:Basement Supply Inlet,                       !- List Name: Zone Air Inlet Nodes
  Underground:Basement WC Exhaust Air Node,                !- List Name: Zone Air Exhaust Nodes
  Underground:Basement Zone Air Node,                      !- Zone Air Node Name
  Underground:Basement Return Outlet;                      !- Zone Return Air Node Name

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> Thanks James...I'll give it a crack.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jim Dirkes" <jim@> wrote:
> >
> > Forgot to say...
> > 
> >  
> > 
> > You must create a new inlet and outlet node for the fan.
> > 
> >  
> > 
> > The Building Performance Team
> > James V. Dirkes II, P.E., BEMP , LEED AP
> > 1631 Acacia Drive NW
> > Grand Rapids, MI 49504
> > 616 450 8653
> > 
> >  
> > 
> > From: Jim Dirkes [mailto:jim@] 
> > Sent: Tuesday, August 02, 2011 4:05 PM
> > To: 'EnergyPlus_Support@xxxxxxxxxxxxxxx'
> > Subject: RE: [EnergyPlus_Support] Re: Insert exhaust
> > 
> >  
> > 
> > Jean,
> > 
> >  
> > 
> > It is essentially the same as any other fan for flow, pressure rise,
> > efficiency.  It is treated differently for the purpose of air / mass balance
> > within a zone.  An air loop fan is  assumed to provide the same amount of
> > air as it returns, maintaining a mass flow balance.
> > 
> >  
> > 
> > Keep in mind that you must know the amount of outdoor air that is introduced
> > to each zone as a result of your Sizing, Controller:Outdoor Air or other
> > outdoor air-introducing objects.  The Fan:ZoneExhaust extracts air from the
> > zone (only) and E+ "watches" to make sure that you've got an equal amount of
> > air to replace it from your air loop or other sources.  If not, it complains
> > with a warning.  Actually it normally complains with 100,000+ warnings!  The
> > OutdoorAir:Mixer seems to respond nicely to maintain a balance by extracting
> > less air from the air loop when there is an exhaust fan in the zone.
> > 
> >  
> > 
> > Finally, if your Fan:ZoneExhaust operates at different times than your air
> > loop, including differing schedules or cycling operation of either the
> > exhaust fan or air loop fan, there will be an imbalance in airflow and
> > warnings will result.
> > 
> >  
> > 
> > The Building Performance Team
> > James V. Dirkes II, P.E., BEMP , LEED AP
> > 1631 Acacia Drive NW
> > Grand Rapids, MI 49504
> > 616 450 8653
> > 
> >  
> > 
> > From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
> > Sent: Tuesday, August 02, 2011 3:22 PM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Subject: [EnergyPlus_Support] Re: Insert exhaust
> > 
> >  
> > 
> >   
> > 
> > Hi James, I've never used this. Does this work without connecting it to the
> > existing AirLoop? If so, what nodes should I connect it to? Do I create new
> > nodes? In the IO ref, the example actually uses what looks like nodes
> > seperate from the AirLoop and the !comments say zone exhaust node and
> > exhaust fan outlet node and says "Air node" as appossed to the usual AirLoop
> > Node phrasing...
> > 
> > How does it work?
> > 
> > Regards,
> > 
> > Jean
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com> , "Jim Dirkes" <jim@>
> > wrote:
> > >
> > > How about Fan:ZoneExhaust?
> > > 
> > > 
> > > 
> > > The Building Performance Team
> > > James V. Dirkes II, P.E., BEMP , LEED AP
> > > 1631 Acacia Drive NW
> > > Grand Rapids, MI 49504
> > > 616 450 8653
> > > 
> > > 
> > > 
> > > From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com> 
> > > [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com> ] On Behalf Of Vinay
> > Devanathan
> > > Sent: Tuesday, August 02, 2011 10:48 AM
> > > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com> 
> > > Subject: Re: [EnergyPlus_Support] Insert exhaust
> > > 
> > > 
> > > 
> > > 
> > > 
> > > You can use the ZoneVentilation:DesignAirFlowRate object under Zone
> > AirFlow
> > > Class.
> > > 
> > > On Tue, Aug 2, 2011 at 10:45 AM, Jean marais <jeannieboef@> wrote:
> > > 
> > > 
> > > 
> > > What's the simplest way to insert an extra, direct to outdoors, exhaust
> > fan
> > > into a zone that already has an airloop?
> > > I'm sorry, this question has been has been asked...What's the simplest way
> > > to insert an extra, direct to outdoors, exhaust fan into a zone that
> > already
> > > has an airloop?
> > > 
> > > Do I create a fictitious zone inside the normal zone with it's own AirLoop
> > > and use an additional zonecrossmixing object for the makeup air out of the
> > > normal zone.
> > >
> >
>




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