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Re: [EnergyPlus_Support] Re: Zone exhaust fan example
But if you put an exhaust fan in this zone, it will not get to the other
zones through cracks around doors, etc. You need to use mixing objects
to "push" the air into the other zones. It's the other zones where you
will use the exhaust fans.
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>
> > <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> <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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