[EnergyPlus_Support] Re: Insert exhaust

["Jean marais" <jeannieboef@xxxxxxxxx>]

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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