I found a couple of questions asked in this category, but not sure anyone has actually sucessfully overwrite the airflow using the EMS, AirTerminal:SingleDuct:Uncontrolled, or it must be using a AirTerminal:SingleDuct:Userdefined?
This EMS just doesn't work, not sure why? Any suggestions are highly appreciated.
EnergyManagementSystem:Sensor,
ZoneTA, !- Name
Core_ZN, !- Output:Variable or Output:Meter Index Key Name
Zone Air Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Actuator, ! Check EMS manual Page 34
CoreZoneAirFlow, !- Name
CORE_ZN DIRECT AIR, !- Actuated Component Unique Name
AirTerminal:SingleDuct:Uncontrolled, !- Actuated Component Type
Mass Flow Rate; !- Actuated Component Control Type
EnergyManagementSystem:ProgramCallingManager,
ZoneAirFlow_Overwrite Manager, !- Name
BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point
ZoneAirFlow_Overwrite; !- Program Name 1
EnergyManagementSystem:Program,
ZoneAirFlow_Overwrite, !- Name
IF ZoneTA>23, !- Program Line 1
SET CoreZoneAirFlow = 0.2, !- Program Line 2
ELSE, !- <none>
SET CoreZoneAirFlow = NULL, !- <none>
ENDIF; !- <none>
Updated:
Now it switched a Userdefined Air terminal units with reheat coil. The reheat coil is not user defined. The airflow can be override, but the reheat coil seems to have connection issues.
AirTerminal:SingleDuct:UserDefined,
Core_ZN VAV Reheat, !- Name
CORE_ZN ATU Sim Programs,!- Overall Model Simulation Program Calling Manager Name
CORE_ZN ATU Init Programs, !- Model Setup and Sizing Program Calling Manager Name
Core_ZN Zone Equip Inlet,!- Primary Air Inlet Node Name
Core_ZN Supply Inlet, !- Primary Air Outlet Node Name
, !- Secondary Air Inlet Node Name
, !- Secondary Air Outlet Node Name
1, !- Number of Plant Loop Connections
Core_ZN Reheat Coil HW Inlet, !- Plant Connection 1 Inlet Node Name
Core_ZN Reheat Coil HW Outlet; !- Plant Connection 1 Outlet Node Name
Coil:Heating:Water,
Core_ZN Reheat Coil, !- Name
HVACOperationSchd, !- Availability Schedule Name
autosize, !- U-Factor Times Area Value {W/K}
autosize, !- Maximum Water Flow Rate {m3/s}
Core_ZN Reheat Coil HW Inlet, !- Water Inlet Node Name
Core_ZN Reheat Coil HW Outlet, !- Water Outlet Node Name
Core_ZN Zone Equip Inlet, !- Air Inlet Node Name
Core_ZN Supply Inlet, !- Air Outlet Node Name
UFactorTimesAreaAndDesignWaterFlowRate, !- Performance Input Method
autosize, !- Rated Capacity {W}
82.2, !- Rated Inlet Water Temperature {C}
16.6, !- Rated Inlet Air Temperature {C}
71.1, !- Rated Outlet Water Temperature {C}
32.2, !- Rated Outlet Air Temperature {C}
1.0; !- Rated Ratio for Air and Water Convection
Branch,
Core_ZN Reheat Coil HW Branch, !- Name
, !- Maximum Flow Rate {m3/s}
, !- Pressure Drop Curve Name
AirTerminal:SingleDuct:UserDefined, !- Component 1 Object Type
Core_ZN VAV Reheat, !- Component 1 Name
Core_ZN Reheat Coil HW Inlet, !- Component 1 Inlet Node Name
Core_ZN Reheat Coil HW Outlet, !- Component 1 Outlet Node Name
Active; !- Component 1 Branch Control Type
The EMS programs are ignored here. In this case, the coil connection parts have some errors. Please see below.
* Severe * Node Connection Error, Node="CORE_ZN ZONE EQUIP INLET", The same node appears as a non-parent Inlet node more than once.
* ~~~ * Reference Object=AIRTERMINAL:SINGLEDUCT:USERDEFINED, Name=CORE_ZN VAV REHEAT
* ~~~ * Reference Object=COIL:HEATING:WATER, Name=CORE_ZN REHEAT COIL
* Severe * Node Connection Error, Node="CORE_ZN REHEAT COIL HW INLET", The same node appears as a non-parent Inlet node more than once.
* ~~~ * Reference Object=AIRTERMINAL:SINGLEDUCT:USERDEFINED, Name=CORE_ZN VAV REHEAT
* ~~~ * Reference Object=COIL:HEATING:WATER, Name=CORE_ZN REHEAT COIL
* Severe * Node Connection Error, Node="CORE_ZN SUPPLY INLET", The same node appears as a non-parent Outlet node more than once.
* ~~~ * Reference Object=AIRTERMINAL:SINGLEDUCT:USERDEFINED, Name=CORE_ZN VAV REHEAT
* ~~~ * Reference Object=COIL:HEATING:WATER, Name=CORE_ZN REHEAT COIL
* Severe * Node Connection Error, Node="CORE_ZN REHEAT COIL HW OUTLET", The same node appears as a non-parent Outlet node more than once.
* ~~~ * Reference Object=AIRTERMINAL:SINGLEDUCT:USERDEFINED, Name=CORE_ZN VAV REHEAT
* ~~~ * Reference Object=COIL:HEATING:WATER, Name=CORE_ZN REHEAT COIL
