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[EnergyPlus_Support] EMS overwrite and CAV system [1 Attachment]



Dear All,

 

I try to model DOAS system and fancoil (FCU) supplement system.

The problem occur when I start use EMS to switch off the FCU’s fans when there aren’t water flow through heating and cooling coil. I have created separate availability schedules for FCU fans:

Fan:OnOff,

    Offices_1st_flo Supply Fan,  !- Name

    Offices_1s_flo_FCU_fan_availability,  !- Availability Schedule Name

And overwrite its value from 1 to 0 if water flows through coils is 0.

 

But I notice that the fan from DOAS system start operate as variable and do not supply max airflow 24/7. If I remove the EMS code the DOAS fan works ok (24/7 at max performance).

I can’t observed the connection. Moreover if in EMS code I change the following:

 

EnergyManagementSystem:Program,

    MyComputedAvSchdProg,    !- Name

    IF (m_ch_w_O1stFLO==0) && (m_h_w_O1stFLO==0),  !- Program Line 1

    Set myOffices_1s_flo_FCU_fan_availability_Override = 0 (change to 1) ,  !- Program Line 2

    ELSE,                    !- A4

    Set myOffices_1s_flo_FCU_fan_availability_Override = 1,  !- A5

    ENDIF,                   !- A6

 

The DOAS fan start operate as should.

 

 

 

 

 

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BR,

Artem Zhukov

 

HVAC Consultant/Building Simulation Engineer

 

Mob.: +420 774 081 898

SKYPE: zhukov_artem

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TO PRINT OR NOT TO PRINT

 

Attachment not found:
d:\eudora\attach\bl_FCU_f-const_w-var-CAV1.zip