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Re: [EnergyPlus_Support] Hotel: Unitary + PTAC Node Problem

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



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