On 03.08.2015, at 21:15, "katdra83@xxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Hello everyone,
I am trying to model a naturally ventilated flat of 4 zones using AirFlowNetwork in Energyplus. The problem appears when I try to override the modulation of window opening area that normally occurs when the ventilation control mode is â??temperatureâ??. I am using EMS in order to define a binary control (on/off) of window opening by using 3 conditions:
IF ( Tzone > VentilationSetpoint ) && ( Tzone > Texternal ) && ( VentilationAvailabilitySchedule ==1)
SET ZoneOpenFactor = 1
ELSE
SET ZoneOpenFactor = 0
ENDIF
VentilationSetpoint and VentilationAvailabilitySchedule are previously defined as Schedule:Compact.
There are no errors for the EMS after the run and it seems to work fine (there are no modulation of window opening area, the open factor is either 0 or 1) but:
During summer when the VentilationSetpoint is set to 26oC, there are many cases that the windows are open even though Tzone < 26oC (I am always referring to the Temperatures of the previous tilmestep). Sometimes the windows are open when the Tzone is even 24.5oC !! This behavior is not consistent throughout the summer period. There are some occasions that the windows are open at 25oC and others that are closed at the same temperature, even though the 3 conditions (mentioned before) are identical.
I have tested different ventilation setpoints (24oC, 27oC) but the problem remains. I tried both â??Constantâ?? and â??Temperatureâ?? as Ventilation control mode but the results are identical.
You can find below the EMS inputs in detail (energyplus v.8.3)
Any help will be more than appreciated !
Catherine
!- =========== ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:SENSOR ===========
EnergyManagementSystem:Sensor,
Tkids, !- Name
BlockNew:KidsBedroom, !- Output:Variable or Output:Meter Index Key Name
Zone Air Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
Tmaster, !- Name
BlockNew:MasterBedroom, !- Output:Variable or Output:Meter Index Key Name
Zone Air Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
Tliving, !- Name
BlockNew:LivingRoom, !- Output:Variable or Output:Meter Index Key Name
Zone Air Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
Tkitchen, !- Name
BlockNew:Kitchen, !- Output:Variable or Output:Meter Index Key Name
Zone Air Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
Tout, !- Name
, !- Output:Variable or Output:Meter Index Key Name
Site Outdoor Air Drybulb Temperature; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
VentAvailSch, !- Name
Window pattern A, !- Output:Variable or Output:Meter Index Key Name
Schedule Value; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:Sensor,
VentSetpoint, !- Name
NatVent setpoint sched A,!- Output:Variable or Output:Meter Index Key Name
Schedule Value; !- Output:Variable or Output:Meter Name
!- =========== ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:ACTUATOR ===========
EnergyManagementSystem:Actuator,
KidsOpenFactor, !- Name
BlockNew:KidsBedroom_Wall_3_0_0_0_0_0_Win, !- Actuated Component Unique Name
AirFlow Network Window/Door Opening, !- Actuated Component Type
Venting Opening Factor; !- Actuated Component Control Type
EnergyManagementSystem:Actuator,
MasterOpenFactor, !- Name
BlockNew:MasterBedroom_Wall_3_0_0_0_0_0_Win, !- Actuated Component Unique Name
AirFlow Network Window/Door Opening, !- Actuated Component Type
Venting Opening Factor; !- Actuated Component Control Type
EnergyManagementSystem:Actuator,
LivingOpenFactor, !- Name
BlockNew:LivingRoom_Wall_11_0_0_0_0_0_Win, !- Actuated Component Unique Name
AirFlow Network Window/Door Opening, !- Actuated Component Type
Venting Opening Factor; !- Actuated Component Control Type
EnergyManagementSystem:Actuator,
KitchenOpenFactor, !- Name
BlockNew:Kitchen_Wall_5_0_0_0_0_0_Win, !- Actuated Component Unique Name
AirFlow Network Window/Door Opening, !- Actuated Component Type
Venting Opening Factor; !- Actuated Component Control Type
!- =========== ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:PROGRAMCALLINGMANAGER ===========
EnergyManagementSystem:ProgramCallingManager,
Tkids Controlled Open Factor, !- Name
BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point
Tkids_OpeningController; !- Program Name 1
EnergyManagementSystem:ProgramCallingManager,
Tmaster Controlled Open Factor, !- Name
BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point
Tmaster_OpeningController; !- Program Name 1
EnergyManagementSystem:ProgramCallingManager,
Tliving Controlled Open Factor, !- Name
BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point
Tliving_OpeningController; !- Program Name 1
EnergyManagementSystem:ProgramCallingManager,
Tkitchen Controlled Open Factor, !- Name
BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point
Tkitchen_OpeningController; !- Program Name 1
!- =========== ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:PROGRAM ===========
EnergyManagementSystem:Program,
Tkids_OpeningController, !- Name
IF ( Tkids > VentSetpoint ) && ( Tkids > Tout ) && ( VentAvailSch == 1 ), !- Program Line 1
SET KidsOpenFactor = 1.0,!- Program Line 2
ELSE, !- A4
SET KidsOpenFactor = 0.0,!- A5
ENDIF; !- A6
EnergyManagementSystem:Program,
Tmaster_OpeningController, !- Name
IF ( Tmaster > VentSetpoint ) && ( Tmaster > Tout ) && ( VentAvailSch == 1 ), !- Program Line 1
SET MasterOpenFactor = 1.0, !- Program Line 2
ELSE, !- A4
SET MasterOpenFactor = 0.0, !- A5
ENDIF; !- A6
EnergyManagementSystem:Program,
Tliving_OpeningController, !- Name
IF ( Tliving > VentSetpoint ) && ( Tliving > Tout ) && ( VentAvailSch == 1 ), !- Program Line 1
SET LivingOpenFactor = 1.0, !- Program Line 2
ELSE, !- A4
SET LivingOpenFactor = 0.0, !- A5
ENDIF; !- A6
EnergyManagementSystem:Program,
Tkitchen_OpeningController, !- Name
IF ( Tkitchen > VentSetpoint ) && ( Tkitchen > Tout ) && ( VentAvailSch == 1 ), !- Program Line 1
SET KitchenOpenFactor = 1.0, !- Program Line 2
ELSE, !- A4
SET KitchenOpenFactor = 0.0, !- A5
ENDIF; !- A6
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