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Re: [EnergyPlus_Support] Hotel: Unitary + PTAC Node Problem
Just to further clarify, the CONTROLLED ZONE EQUIP CONFIGURATION "Node List or
Node Name: Zone Air Inlet Node(s)" field must be a NODE LIST name which lists
both the direct air and PTAC inlet nodes. So the quickest fix lies in the
CONTROLLED ZONE EQUIP CONFIGURATION and NODE LIST objects. For example, for
zone 1E
---- existing ------
CONTROLLED ZONE EQUIP CONFIGURATION,
1E, !- Zone Name
1E Equipment, !- List Name: Zone Equipment
1E Zone Equip Inlet, !- Node List or Node Name: Zone Air Inlet Node(s)
. . .
NODE LIST,
1E Zone Equip Inlet, !- Node List Name
Zone1E_PTACAirOutletNode;!- Node_ID_1
---- Fixed ------
CONTROLLED ZONE EQUIP CONFIGURATION,
1E, !- Zone Name
1E Equipment, !- List Name: Zone Equipment
1E Zone Equip Inlet Nodes, !- Node List or Node Name: Zone Air Inlet
Node(s)
. . .
NODE LIST,
1E Zone Equip Inlet Nodes, !- Node List Name
1E Zone Equip Inlet, !- Node_ID_1
Zone1E_PTACAirOutletNode;!- Node_ID_2
Mike
On 5 Dec 2006 at 15:18, Richard Raustad wrote:
> You are getting confused with the node names for the PTHP inlet/outlet
> and the air loop inlet/outlet node names. You have connected the PTHP
> outlet node to the air loop and direct air unit through a node list.
> Keep the node names for the PTHP inlet/outlet nodes separate from the
> node names for the air loop. The direct air unit is the zone connection
> for the air loop, not the PTHP. See the example file for
> PackagedTerminalHeatPump for connection details. I suggest you write out
> all example file node names for at least a single zone on a piece of
> paper so you can see the connections more clearly.
>
> Air Loop 1
> |--------|
> ____|________|_____
> | Zone1 Zone1 |
> |Supply Return |
> | Node1 Node |
> | |
> | Zone1 |_____
> | Supply | |
> | Node2 | |
> | | PTHP1
> | | |
> | | |
> | Zone1 |-----
> | Exhaust |
> | Node |
> -------------------
>
> PACKAGEDTERMINAL:HEATPUMP:AIRTOAIR,
> Zone1EPTAC, !- Heat pump name
> FanAndCoilAvailSched, !- Availability schedule name
> Zone1E_PTACAirInletNode, !- Air inlet node name
> >>>>Zone1E_PTACAirOutletNode,!- Air outlet node name
> Zone1E_PTACOAInNode, !- Outside air node name
> Zone1E_PTACExhNode, !- Relief air node name
> Zone1E_PTACOAMixer, !- Outside air mixer name
> autosize, !- Supply air volumetric flow rate during
> cooling operation {m3/s}
> autosize, !- Supply air volumetric flow rate during
> heating operation {m3/s}
> autosize, !- Supply air volumetric flow rate when no
> cooling or heating is needed {m3/s}
> autosize, !- Outside air volumetric flow rate during
> cooling operation {m3/s}
> autosize, !- Outside air volumetric flow rate during
> heating operation {m3/s}
> autosize, !- Outside air volumetric flow rate when no
> cooling or heating is needed {m3/s}
> FAN:SIMPLE:ONOFF, !- Supply air fan type
> 1E PTAC Supply Fan, !- Supply air fan name
> COIL:DX:HeatingEmpirical,!- Heating coil type
> 1E PTAC DX Heating Coil, !- Heating coil name
> 0.001, !- Heating convergence tolerance
> {dimensionless}
> -8, !- Minimum outdoor dry-bulb temperature for
> compressor operation {C}
> COIL:DX:CoolingBypassFactorEmpirical, !- Cooling coil type
> 1E PTAC Cooling Coil, !- Cooling coil name
> 0.001, !- Cooling convergence tolerance
> {dimensionless}
> COIL:ELECTRIC:HEATING, !- Supplemental heating coil type
> 1E PTAC Heating Coil, !- Supplemental heating coil name
> autosize, !- Maximum supply air temperature from
> supplemental heater {C}
> 21, !- Maximum outdoor dry-bulb temperature for
> supplemental heater operation {C}
> blow through, !- Fan placement
> ContFanCycComp; !- Heat pump operating mode
>
> NODE LIST,
> ----1E Zone Equip Inlet, !- Node List Name
> >>>>Zone1E_PTACAirOutletNode;!- Node_ID_1
>
> DIRECT AIR,
> 1E Direct Air, !- Direct Air Name
> COMPACT HVAC-ALWAYS 1, !- Schedule name for on/off schedule
> ----1E Zone Equip Inlet, !- Zone Supply Air Node Name
> autosize; !- Maximum air flow rate {m3/s}
>
>
> noelcrrl wrote:
>
> > I am simulating a compact unitary system with PTAC units. The purpose
> > of this is to model an HVAC system in a hotel. I have integrated both
> > systems into the model, but I have encountered an error that I have
> > not been able to resolve. It seems that I have improperly designated
> > the zone air inlet nodes for each zone. I receive the following error
> > for all zones with the compact unitary and PTAC combination:
> >
> > ** Severe ** Node Connection Error, Node="ZONE1E_PTACAIROUTLETNODE",
> > The same node appears as a non-parent Outlet node more than once.
> > ** ~~~ ** Reference Object=ZONE SPLITTER, Name=1E ZONE SPLITTER
> > ** ~~~ ** Reference Object=COIL:ELECTRIC:HEATING,
> > Name=1E PTAC HEATING COIL
> >
> > Any ideas on how to fix this? I have posted the file as a reference.
> >
> > File Description: Hotel: Unitary + PTAC Node Problem
> >
> >
>
>
> --
> 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
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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