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Re: [EnergyPlus_Support] Re: Zone exhaust fan example
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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