[EnergyPlus_Support] Re: About the WindAC

["donbshireyiii" <shirey@xxxxxxxxxxxx>]

Stewart:

As you have found, the window air conditioner object can only provide
cooling, not heating.  If you look at the WindACAuto.idf example file,
you see that baseboard heating is used along with the window air
conditioner in this particular example file.

A packaged terminal heat pump object will be added in a future version
(Fall 2005 or Spring 2006) which will allow both cooling and heating.

In the meantime, I suggest that you look at the example file
FurnaceWithDXSystem.idf.  You can use a FURNACE:BLOWTHRU:HEATCOOL
object in a air loop to model cooling with the
COIL:DX:CoolingBypassFactorEmpirical and you can specify
COIL:ELECTRIC:HEATING for heating.

Don

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "beyangj" <beyangj@h...>
wrote:
> Dear,
> I'm doing a simulation for a residential building. The window air 
> conditioner model in EnergyPlus is "cooling only",  but there need 
> heating in the winter in my model, so I chose the 
> COIL:ELECTRIC:HEATING for heating, and the 
> COIL:DX:CoolingBypassFactorEmpirical is followed by the 
> COIL:ELECTRIC:HEATING.
> When I set the items as follow,
> 
> NODE LIST,
>     GAB1Inlets,              !- Node List Name
>     GAB1 Heating Coil Outlet Node; !- Node_ID_1
> 
> NODE LIST,
>     GAB1Exhausts,            !- Node List Name
>     GAB1WindACAirInletNode;  !- Node_ID_1
> 
> COIL:Electric:Heating,
>     GAB1 Heating Coil,       !- Coil Name
>     HEAT-SCHED-B1,           !- Available Schedule
>     1,                       !- Efficiency of the Coil
>     autosize,                !- Nominal Capacity of the Coil {W}
>     GAB1WindACAirOutletNode, !- Coil_Air_Inlet_Node
>     GAB1 Heating Coil Outlet Node;  !- Coil_Air_Outlet_Node
> 
> COIL:DX:CoolingBypassFactorEmpirical,
>     GAB1WindACDXCoil,        !- Coil Name
>     System Available Schedule-B1,  !- Availability Schedule
>     autosize,                !- Rated Total Cooling Capacity
(gross) 
> {W}
>     autosize,                !- Rated SHR
>     3.0,                     !- Rated COP
>     autosize,                !- Rated Air Volume Flow Rate {m3/s}
>     GAB1WindACFanOutletNode, !- Coil Air Inlet Node
>     GAB1WindACAirOutletNode, !- Coil Air Outlet Node
>     WindACCoolCapFT,         !- Total Cooling Capacity Modifier
Curve 
> (function of temperature)
>     WindACCoolCapFFF,        !- Total Cooling Capacity Modifier
Curve 
> (function of flow fraction)
>     WindACEIRFT,             !- Energy Input Ratio Modifier Curve 
> (function of temperature)
>     WindACEIRFFF,            !- Energy Input Ratio Modifier Curve 
> (function of flow fraction)
>     WindACPLFFPLR,           !- Part Load Fraction Correlation 
> (function of part load ratio)
>     CycFanCycComp;           !- Supply Air Fan Operation Mode
> 
> AIR CONDITIONER:WINDOW:CYCLING,
>     GAB1WindAC,              !- name of window AC unit
>     System Available Schedule-B1,  !- availability schedule
>     autosize,                !- maximum air flow rate {m3/s}
>     autosize,                !- maximum outside air flow rate {m3/s}
>     GAB1WindACAirInletNode,  !- air inlet node
>     GAB1WindACAirOutletNode, !- air outlet node
>     GAB1WindACOAInNode,      !- outside air node
>     GAB1WindACExhNode,       !- air relief node
>     GAB1WindACOAMixer,       !- outside air mixer name
>     GAB1WindACFan,           !- fan name
>     GAB1WindACDXCoil,        !- DX cooling coil name
>     CycFanCycComp,           !- operation mode
>     blow through,            !- fan placement
>     0.001,                   !- Cooling Convergence Tolerance
>     COIL:DX:CoolingBypassFactorEmpirical;  !- Cooling coil type
> 
> there were such error messages as follow in the ERR file after 
> running the IDF file,
>  
>    ** Severe  ** Error in Node="GAB1 HEATING COIL OUTLET NODE", 
> ZoneInlet node did not find an outlet node.
>    **   ~~~   ** Reference Object=CONTROLLED ZONE EQUIP 
> CONFIGURATION, Name=GAB1
>    ************* No node connection errors were found.
>    ** Warning ** The following lines are "Orphan Objects".  These 
> objects are in the idf
>    **   ~~~   **  file but are never obtained by the simulation and 
> therefore are NOT used.
>    **   ~~~   **  See InputOutputReference document for more
details.
>    ************* Object=COIL:ELECTRIC:HEATING=GAB1 HEATING COIL
>  
> I just found the item definitions in Air Conditioner:Window:Cycling 
> are that the air inlet node should be one of the zone exhaust nodes 
> for the zone which the window air conditioner is cooling, and the
air 
> outlet node should be one of the inlet air nodes for the zone which 
> is being cooled. I wondered whether I can add the 
> COIL:ELECTRIC:HEATING to the window air conditioner system. If so, 
> how can I connect them?  Thanks in advance!
> 
> Best,
> 
> Stewart




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