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Re: [EnergyPlus_Support] Re: Zone exhaust fan example

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Zone exhaust fan example
From: Greg Smith <EPlusUser@xxxxxxxxx>
Date: Wed, 12 Mar 2008 10:10:52 -0600
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Thank you!  I'll give this a try.

-Greg

On Mar 12, 2008, at 10:00 AM, Richard Raustad wrote:

> Here's an example. You will need to use a Node List in the CONTROLLED
> ZONE EQUIP CONFIGURATION object since the PTAC will also need to have
> it's own exhaust node. You don't have to worry about the exhaust fan
> outlet node, it just blows air to outdoors and is not needed in the
> simulation except for the fan itself.
>
> ZONE EQUIPMENT LIST,
> Zone1Equipment, !- Name
> PACKAGEDTERMINAL:AIRCONDITIONER, !- KEY--Zone Equipment Type 1
> Zone1PTAC, !- Type Name 1
> 1, !- Cooling Priority 1
> 1, !- Heating Priority 1
> ZONE EXHAUST FAN, !- Zone Equipment Type 2
> Zone1 Exhaust Fan, !- Type Name 2
> 2, !- Cooling Priority 1
> 2; !- Heating Priority 1
>
> PACKAGEDTERMINAL:AIRCONDITIONER,
> Zone1PTAC, !- Air conditioner name
> FanAndCoilAvailSched, !- Availability schedule name
> Zone1PTACAirInletNode, !- Air inlet node name
> Zone1PTACAirOutletNode, !- Air outlet node name
> Zone1PTACOAMixer, !- Outside air mixer name
> 0.5, !- Supply air volumetric flow rate during
> cooling operation {m3/s}
> 0.6, !- Supply air volumetric flow rate during
> heating operation {m3/s}
> , !- Supply air volumetric flow rate when no
> cooling or heating is needed {m3/s}
> 0.028, !- Outside air volumetric flow rate during
> cooling operation {m3/s}
> 0.0233, !- Outside air volumetric flow rate during
> heating operation {m3/s}
> 0.0186, !- Outside air volumetric flow rate when no
> cooling or heating is needed {m3/s}
> FAN:SIMPLE:CONSTVOLUME, !- Supply air fan type
> Zone1PTACFan, !- Supply air fan name
> COIL:GAS:HEATING, !- Heating coil type
> Zone1PTACHeater, !- Heating coil name
> COIL:DX:CoolingBypassFactorEmpirical, !- Cooling coil type
> Zone1PTACDXCoolCoil, !- Cooling coil name
> blow through, !- Fan placement
> ConstantFanSch; !- Supply air fan operating mode schedule name
>
> ZONE EXHAUST FAN,
> Zone1 Exhaust Fan, !- Exhaust Fan Name
> FanAndCoilAvailSched, !- Availability Schedule
> 0.7, !- Fan Total Efficiency
> 500, !- Delta Pressure {Pa}
> 0.01, !- Max Flow Rate {m3/s}
> Zone1 Exhaust Node, !- Fan_Inlet_Node
> Zone1 Exhaust Fan Outlet Node, !- Fan_Outlet_Node
> Zone Exhaust; !- End-Use Subcategory
>
> CONTROLLED ZONE EQUIP CONFIGURATION,
> NORTH ZONE, !- Zone Name
> Zone1Equipment, !- List Name: Zone Equipment
> Zone1Inlets, !- Node List or Node Name: Zone Air Inlet
> Node(s)
> Zone1Exhausts, !- Node List or Node Name: Zone Air Exhaust
> Node(s)
> Zone 1 Node, !- Zone Air Node Name
> Zone 1 Outlet Node; !- Zone Return Air Node Name
>
> NODE LIST,
> Zone1Exhausts, !- Node List Name
> Zone1PTACAirInletNode, !- Node_ID_1
> Zone1 Exhaust Node; !- Node_ID_2
>
> NODE LIST,
> Zone1Inlets, !- Node List Name
> Zone1PTACAirOutletNode; !- Node_ID_1
>
> boulder1259 wrote:
> >
> > 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
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, 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 <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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References:
- [EnergyPlus_Support] Re: Zone exhaust fan example
  - From: boulder1259
- Re: [EnergyPlus_Support] Re: Zone exhaust fan example
  - From: Richard Raustad

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