EMS Actuator no change in mass flow rate.

asked 2021-03-08 10:13:38 -0500

lobo gravatar image

updated 2021-03-09 01:09:06 -0500

Hi,

I'm trying to control both the setpoint temperature and the mass flow rate of a 5 zone HVAC system. You find the IDF here https://drive.google.com/file/d/1hjnx....

I can change and the supply setpoint temperature and the overall supply mass flow rate, but I cannot change the individual zone mass flow rate.

 EnergyManagementSystem:Actuator,
    mdot_fan,                !- Name
    SUPPLY FAN 1,            !- Actuated Component Unique Name
    Fan,                     !- Actuated Component Type
    Fan Air mass Flow Rate;  !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    T_in_air,                !- Name
    VAV SYS 1 OUTLET NODE,   !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Temperature Setpoint;    !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_air,                !- Name
    MIXED AIR NODE 1,        !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_1,                  !- Name
    SPACE1-1 ZONE COIL AIR IN NODE,  !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_2,                  !- Name
    SPACE2-1 ZONE COIL AIR IN NODE,  !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_3,                  !- Name
    SPACE3-1 ZONE COIL AIR IN NODE,  !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_4,                  !- Name
    SPACE4-1 ZONE COIL AIR IN NODE,  !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    mdot_5,                  !- Name
    SPACE5-1 ZONE COIL AIR IN NODE,  !- Actuated Component Unique Name
    System Node Setpoint,    !- Actuated Component Type
    Mass Flow Rate Setpoint; !- Actuated Component Control Type

EnergyManagementSystem:Program,
    setActions,              !- Name
    SET T_in_air = 20,       !- Program Line 1
    SET mdot_fan= mdot_1 + mdot_2 + mdot_3 + mdot_4 + mdot_5;  !- Program Line 2


EnergyManagementSystem:Program,
    setmdot,                 !- Name
    SET mdot_1 = 0.25,       !- Program Line 1
    SET mdot_2 = 0.25,       !- Program Line 2
    SET mdot_3 = 0.25,       !- A4
    SET mdot_4 = 0.25,       !- A5
    SET mdot_5 = 0.25;       !- A6

EnergyManagementSystem:ProgramCallingManager,
    mdot,                    !- Name
    InsideHVACSystemIterationLoop,  !- EnergyPlus Model Calling Point
    setmdot;                 !- Program Name 1

EnergyManagementSystem:ProgramCallingManager,
    act,                     !- Name
    InsideHVACSystemIterationLoop,  !- EnergyPlus Model Calling Point
    setActions;              !- Program Name 1

Looking at the EDD file I see that for each zone I can use those actuators but none of them makes the change in the zone mass flow rate.

SPACE1-1 IN NODE
SPACE1-1 NODE
SPACE1-1 OUT NODE
SPACE1-1 ZONE COIL AIR IN NODE
SPACE1-1 ATU IN NODE

How can I solve this issue?

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