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[EnergyPlus_Support] Re: Hotel: Unitary + PTAC Node Problem
Thanks Mike. Your advice did the trick.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@...> wrote:
>
> 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]
> >
> >
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
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> >
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> >
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> >
> >
> >
> >
> >
>
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